Engineering Research Publication
Best International Journals, High Impact Journals,
International Journal of Engineering & Technical Research
ISSN : 2321-0869 (O) 2454-4698 (P)
www.erpublication.org
This document summarizes research on improving ambiguity resolution in GPS positioning using an ionospheric differential correction model. Data was collected from two stations in Malaysia's equatorial region over a short baseline of 33 km. Applying corrections from an ionospheric model led to ambiguities being resolved faster, in under an hour, compared to uncorrected data which took over 2.5 hours. The model also produced smaller standard errors in baseline positioning and increased the variance ratio and decreased reference variance indicators of successful ambiguity resolution. The findings show that an ionospheric differential correction model can improve ambiguity resolution for single frequency GPS over short baselines.
Construction of MT for use in Single Molecule ExperimentsStephen Kenyon
The document describes the construction of magnetic tweezers for use in single molecule experiments at Gettysburg College. Magnetic tweezers use magnets to apply forces to paramagnetic beads attached to molecules like DNA, allowing researchers to study the molecules' behavior under force. The author details the design of magnetic tweezers built at Gettysburg, including the light source, magnets on a rotary motor, and a flow cell to hold samples under an objective lens. The tweezers design aims to enable high-resolution studies of single molecules like DNA through force and position measurements of attached beads.
This article describes two experiments using single photons to determine the index of refraction and thickness of a microscope coverslip. In the first experiment, transmission of single photons through the coverslip at various angles is measured to determine the index of refraction by fitting the data to Fresnel equations. In the second experiment, photons pass through the coverslip in an interferometer to measure changes in optical path length, allowing the thickness to be calculated using the known index from the first experiment. The results from both single-photon experiments agree well with theoretical models.
This document describes a physics experiment to determine the wavelength of sodium light using Newton's rings. The experiment uses a plano-convex lens, sodium lamp, glass plate, and traveling microscope to create interference fringes known as Newton's rings. Measurements of the ring radii are taken and used in the formula λ = (D2n+m-D2n)/ 4Rp to calculate the wavelength, where λ is 542.036 angstroms. Precautions are outlined to ensure accurate measurements and reduce error in the experiment.
II. Charge transport and nanoelectronics.
Quantum Hall Effect: 2D electron gas (2DEG) in magnetic field, Landau levels, de Haas-van Alphen and Shubnikov-de Haas Effects, integer and fractional quantum Hall effects, Spin Hall Effect.
Quantum transport: Transport regimes and mesoscopic quantum transport, Scattering theory of conductance and Landauer-Buttiker formalism, Quantum point contacts, Quantum electronics and selected examples of mesoscopic devices (quantum interference devices).
Tunneling: Scanning tunneling microscopy and spectroscopy (and wavefunction mapping in nanostructures and molecules), Nanoelectronic devices based on tunneling, Coulomb blockade, Single electron transistors, Kondo effect.
Molecular electronics: Donor-Acceptor systems, Nanoscale charge transfer, Electronic properties and transport in molecules and biomolecules; single molecule transistors.
The document discusses using electromagnetically induced transparency (EIT) to increase the sensitivity of gravitational wave interferometers. It explores EIT properties through modeling and simulation to determine parameters that theoretically allow high transmission and narrow linewidths suitable for filtering squeezed light. Experimentally, the largest contrast observed was 3.9% with a linewidth of 657 Hz, while the narrowest linewidth was 202 Hz with 0.84% contrast. Both simulation and experimental results are presented and compared.
Engineering Research Publication
Best International Journals, High Impact Journals,
International Journal of Engineering & Technical Research
ISSN : 2321-0869 (O) 2454-4698 (P)
www.erpublication.org
This document summarizes research on improving ambiguity resolution in GPS positioning using an ionospheric differential correction model. Data was collected from two stations in Malaysia's equatorial region over a short baseline of 33 km. Applying corrections from an ionospheric model led to ambiguities being resolved faster, in under an hour, compared to uncorrected data which took over 2.5 hours. The model also produced smaller standard errors in baseline positioning and increased the variance ratio and decreased reference variance indicators of successful ambiguity resolution. The findings show that an ionospheric differential correction model can improve ambiguity resolution for single frequency GPS over short baselines.
Construction of MT for use in Single Molecule ExperimentsStephen Kenyon
The document describes the construction of magnetic tweezers for use in single molecule experiments at Gettysburg College. Magnetic tweezers use magnets to apply forces to paramagnetic beads attached to molecules like DNA, allowing researchers to study the molecules' behavior under force. The author details the design of magnetic tweezers built at Gettysburg, including the light source, magnets on a rotary motor, and a flow cell to hold samples under an objective lens. The tweezers design aims to enable high-resolution studies of single molecules like DNA through force and position measurements of attached beads.
This article describes two experiments using single photons to determine the index of refraction and thickness of a microscope coverslip. In the first experiment, transmission of single photons through the coverslip at various angles is measured to determine the index of refraction by fitting the data to Fresnel equations. In the second experiment, photons pass through the coverslip in an interferometer to measure changes in optical path length, allowing the thickness to be calculated using the known index from the first experiment. The results from both single-photon experiments agree well with theoretical models.
This document describes a physics experiment to determine the wavelength of sodium light using Newton's rings. The experiment uses a plano-convex lens, sodium lamp, glass plate, and traveling microscope to create interference fringes known as Newton's rings. Measurements of the ring radii are taken and used in the formula λ = (D2n+m-D2n)/ 4Rp to calculate the wavelength, where λ is 542.036 angstroms. Precautions are outlined to ensure accurate measurements and reduce error in the experiment.
II. Charge transport and nanoelectronics.
Quantum Hall Effect: 2D electron gas (2DEG) in magnetic field, Landau levels, de Haas-van Alphen and Shubnikov-de Haas Effects, integer and fractional quantum Hall effects, Spin Hall Effect.
Quantum transport: Transport regimes and mesoscopic quantum transport, Scattering theory of conductance and Landauer-Buttiker formalism, Quantum point contacts, Quantum electronics and selected examples of mesoscopic devices (quantum interference devices).
Tunneling: Scanning tunneling microscopy and spectroscopy (and wavefunction mapping in nanostructures and molecules), Nanoelectronic devices based on tunneling, Coulomb blockade, Single electron transistors, Kondo effect.
Molecular electronics: Donor-Acceptor systems, Nanoscale charge transfer, Electronic properties and transport in molecules and biomolecules; single molecule transistors.
The document discusses using electromagnetically induced transparency (EIT) to increase the sensitivity of gravitational wave interferometers. It explores EIT properties through modeling and simulation to determine parameters that theoretically allow high transmission and narrow linewidths suitable for filtering squeezed light. Experimentally, the largest contrast observed was 3.9% with a linewidth of 657 Hz, while the narrowest linewidth was 202 Hz with 0.84% contrast. Both simulation and experimental results are presented and compared.
1) Fourier analysis transforms images from the spatial domain to the frequency domain, allowing images to be manipulated in unexpected ways.
2) It represents any signal as a sum of sinusoids, encoding spatial frequency, magnitude, and phase information for each pixel.
3) This frequency domain representation can then be modified and transformed back, providing a means to filter images and extract geometric information.
This document describes a method for detecting buried radioactive metal objects like depleted uranium using electromagnetic induction (EMI) data. It uses a multistage learning approach including feature extraction of EMI response signatures, one-class support vector machine training to generate classification maps, and clustering to separate objects into classes based on depth. Validation with laboratory EMI measurements of metal rods showed the method can accurately classify depleted uranium objects buried at different depths (surface, 30cm, 60cm) with an average accuracy of 95%, outperforming other common detection techniques.
The microFTS is a new type of compact Fourier-transform spectrometer that combines features of Michelson FT-IRs and dispersive spectrometers. It could enable real-time atmospheric monitoring, industrial process control, medical diagnostics, and defense/security applications due to its small size, ruggedness, and fast data acquisition. Potential modifications include different wavelength ranges, detector arrays, and portable battery-powered designs.
The document describes a method for estimating parameters of an imploded shell target based on analysis of x-ray radiographs. X-ray radiography is used to measure the target's optical thickness, related to density, by analyzing the shadow cast on a radiograph. A model treats the target as a spherical shell to estimate the inner radius, outer radius, and central optical thickness based on the radiograph's intensity profile. Measurement uncertainties are accounted for using a weighted least-squares method to minimize error and determine parameter estimate uncertainties from the model fit to the data. Choosing an optimal backlighter photon energy can provide a radiograph profile that yields the most precise parameter estimates.
1. The document discusses using NMR experiments and simulations to study the pore geometry of porous solids.
2. It presents an approach using Carr-Parcell-Meiboom-Gill (CPMG) echo trains measured by NMR for liquid diffusing in submicron pores to characterize the pore morphology.
3. Both numerical simulations of NMR signals from a model porous structure and experimental CPMG measurements on a porous glass are shown, finding reasonable agreement between the two.
ABSTRACT
Medical images are pictures of distributions of physical attributes captured by an image acquisition system. Most of today’s images are digital. They may be post processed for analysis by a computer-assisted method. Edges are important features in an image. Edge detection extracts salient features from an image such as corners, lines and curves. These features are used by higher level computer vision algorithms. Segmentation plays a crucial role in extraction of useful information and attributes from medical images. Different edge detection methods are applied on dental images. It is implemented using MATLAB.
Keywords – Edge Detection, Dental Image, Canny
This document describes the calibration of an optical tweezer apparatus used to trap and manipulate polystyrene microbeads. Preliminary measurements found the trap stiffness to be 0.00591 ± 0.00139 pN/nm in the x direction and 0.00693 ± 0.00068 pN/nm in the y direction. However, the accuracy of these results is questionable due to unresolved issues with the apparatus. Additionally, the effect of surface proximity on backscattered laser light was investigated. Once calibrated, the apparatus can measure piconewton scale forces and will be used for experiments involving confined DNA molecules.
1) Photonic nanojets can influence the trapping behavior of multiple microspheres that are axially trapped in a focused laser beam. 2) Simulations show that when two microspheres approach each other axially in the beam, they are initially pushed apart by scattering forces but can become drawn together by a connecting photonic nanojet that forms between them. 3) Three microspheres may also become tethered when specific refractive index conditions are met between each neighboring pair.
This presentation is on dynamic light scattering characterization technique. DLS is cost effective size analysis method for nanoparticles and colloids.
Scanning probe microscopy, atomic force microscopy, contact, non contact, tapping modes, nanomechanics, lateral force microscopy, phase imaging, electric force microscopy, magnetic force microscopy, cantiliver fabrication and characterization, tip performance, force spectroscopy, force volume, nanoindentation, macromolecule unfolding, nanomechanical properties, cytomechanics
Modified Discrete Firefly Algorithm Combining Genetic Algorithm for Traveling...TELKOMNIKA JOURNAL
This document presents a modified discrete firefly algorithm combining genetic algorithm to solve the traveling salesman problem. The key points are:
1) It redefines the distance measure and location updating formula for the discrete firefly algorithm to avoid getting stuck in local optima.
2) It introduces genetic algorithm to initialize the population and includes a neighborhood search algorithm for further exploration.
3) Experimental results on benchmark problems show the new algorithm finds perfect solutions faster than other algorithms and significantly improves computational speed and reduces the number of iterations needed.
MEASUREMENT OF SCATTERING LOSSES OF LASER COMPONENTS BY TOTAL INTEGRATED SCAT...Simona Liukaityte
This document summarizes research on measuring scattering losses of laser components using the Total Integrated Scattering (TIS) method with different beam diameters. The study found that using smaller beam diameters (less than 0.4mm required by standards) increased the resolution of surface maps but also increased measurement durations and scattering loss values. Smaller beams made smaller defects and damages more visible. Beam diameters from 0.2mm to 1.12mm produced scattering loss measurements that varied within ±10% and are suitable for measurements.
Poster presentation I gave with one other student at the 2016 UO Undergraduate Research Symposium in collaboration with the Material Science Institute.
The document discusses various precision measurement instruments based on laser technology including laser interferometers, laser telemetric systems, laser and LED based distance measuring instruments, scanning laser gauges, and interferometry. Laser interferometers can measure lengths with high accuracy in the order of 0.1 μm over distances of 100m. Laser telemetric systems allow non-contact measurement of moving components. Scanning laser gauges can measure object diameters between 0.05mm to 450mm with accuracy of ±0.25 μm. Interferometry utilizes the interference of light waves to enable highly precise dimensional measurements.
This document summarizes an experiment on ultrafiltration and gel electrophoresis. For ultrafiltration, the goals were to understand membrane separation principles and parameters like osmotic pressure and fouling. Experiments tested filtration rate with different protein concentrations. Results showed osmotic pressure had a greater effect on mass transfer than fouling. For gel electrophoresis, the goals were to separate and measure molecular weights of pepsin and rennet using SDS-PAGE. Results showed crude pepsin, pure pepsin, and rennet-pepsin mixture were close to literature values, while rennet alone had some unexpected bands possibly from breakdown.
These images are practice shots for macro photography and landscape photography. The photographer took test shots for close-up macro photography as well as wide landscape shots. The goal was to practice different photography techniques and subjects.
This document summarizes an experiment on interference fringes using a sodium lamp as a monochromatic light source. Rays from the source were reflected through a plano convex lens and formed circular interference patterns known as Newton's rings on the glass surface. The width of the fringes could be measured using a traveling microscope and used to calculate the wavelength of light from the sodium lamp through a formula accounting for the air gap between the lens and glass surface. The circular fringes resulted from the plano-convex lens shaping the light waves into concentric rings.
The document describes an experiment to determine the separation between the plates of a Fabry Perot etalon. It provides background on the Fabry Perot interferometer and the principle of interference in the etalon. The experimental setup involves illuminating the etalon with a laser and measuring the angular diameters of interference fringes observed on a screen. By plotting the order of interference versus the cosine of the fringe angles and determining the slope, the separation between the etalon plates is calculated as approximately 2-3 mm, remaining constant despite varying the screen distance.
Magnetic nanoliposomes for combined hyperthermia and drug deliveryPriyank Kulshrestha
Thermosensitive Magnetic liposomes for combined hyperthermia and drug delivery
The document summarizes the development of thermosensitive magnetic liposomes containing iron oxide nanoparticles and the anticancer drug paclitaxel. The liposomes were characterized and found to release their drug payload when heated by an external alternating magnetic field via heat generated by the iron oxide nanoparticles. In vitro tests showed the magnetic liposomes were efficiently internalized by cancer cells and caused higher cytotoxicity when heated compared to untreated cells. The liposomes also showed potential for pulmonary delivery via nebulization with a portion depositing in the lungs. The system aims to provide localized hyperthermia and drug delivery for cancer treatment.
1) Diffraction refers to the spreading or bending of waves around edges, which results in a characteristic fringe pattern from a single slit consisting of alternating bright and dark fringes that fade from the center.
2) Interference patterns from thin films and multiple slits can be explained by the optical path difference between light waves reflecting or diffracting from different points, with constructive and destructive interference occurring at specific path differences.
3) A diffraction grating splits light into multiple beams at specific angles determined by the grating spacing and wavelength, allowing spectrometers to measure light wavelengths.
The index of refraction of air is approximately 1. The Brewster's angle θB is given by tanθB = n2/n1.
Plugging in the values given, we get:
tanθB = 1.52/1
θB = arctan(1.52) = 56.3°
Therefore, the Brewster's angle when the glass plate (n2 = 1.52) is in air (n1 = 1) is 56.3°.
1) Fourier analysis transforms images from the spatial domain to the frequency domain, allowing images to be manipulated in unexpected ways.
2) It represents any signal as a sum of sinusoids, encoding spatial frequency, magnitude, and phase information for each pixel.
3) This frequency domain representation can then be modified and transformed back, providing a means to filter images and extract geometric information.
This document describes a method for detecting buried radioactive metal objects like depleted uranium using electromagnetic induction (EMI) data. It uses a multistage learning approach including feature extraction of EMI response signatures, one-class support vector machine training to generate classification maps, and clustering to separate objects into classes based on depth. Validation with laboratory EMI measurements of metal rods showed the method can accurately classify depleted uranium objects buried at different depths (surface, 30cm, 60cm) with an average accuracy of 95%, outperforming other common detection techniques.
The microFTS is a new type of compact Fourier-transform spectrometer that combines features of Michelson FT-IRs and dispersive spectrometers. It could enable real-time atmospheric monitoring, industrial process control, medical diagnostics, and defense/security applications due to its small size, ruggedness, and fast data acquisition. Potential modifications include different wavelength ranges, detector arrays, and portable battery-powered designs.
The document describes a method for estimating parameters of an imploded shell target based on analysis of x-ray radiographs. X-ray radiography is used to measure the target's optical thickness, related to density, by analyzing the shadow cast on a radiograph. A model treats the target as a spherical shell to estimate the inner radius, outer radius, and central optical thickness based on the radiograph's intensity profile. Measurement uncertainties are accounted for using a weighted least-squares method to minimize error and determine parameter estimate uncertainties from the model fit to the data. Choosing an optimal backlighter photon energy can provide a radiograph profile that yields the most precise parameter estimates.
1. The document discusses using NMR experiments and simulations to study the pore geometry of porous solids.
2. It presents an approach using Carr-Parcell-Meiboom-Gill (CPMG) echo trains measured by NMR for liquid diffusing in submicron pores to characterize the pore morphology.
3. Both numerical simulations of NMR signals from a model porous structure and experimental CPMG measurements on a porous glass are shown, finding reasonable agreement between the two.
ABSTRACT
Medical images are pictures of distributions of physical attributes captured by an image acquisition system. Most of today’s images are digital. They may be post processed for analysis by a computer-assisted method. Edges are important features in an image. Edge detection extracts salient features from an image such as corners, lines and curves. These features are used by higher level computer vision algorithms. Segmentation plays a crucial role in extraction of useful information and attributes from medical images. Different edge detection methods are applied on dental images. It is implemented using MATLAB.
Keywords – Edge Detection, Dental Image, Canny
This document describes the calibration of an optical tweezer apparatus used to trap and manipulate polystyrene microbeads. Preliminary measurements found the trap stiffness to be 0.00591 ± 0.00139 pN/nm in the x direction and 0.00693 ± 0.00068 pN/nm in the y direction. However, the accuracy of these results is questionable due to unresolved issues with the apparatus. Additionally, the effect of surface proximity on backscattered laser light was investigated. Once calibrated, the apparatus can measure piconewton scale forces and will be used for experiments involving confined DNA molecules.
1) Photonic nanojets can influence the trapping behavior of multiple microspheres that are axially trapped in a focused laser beam. 2) Simulations show that when two microspheres approach each other axially in the beam, they are initially pushed apart by scattering forces but can become drawn together by a connecting photonic nanojet that forms between them. 3) Three microspheres may also become tethered when specific refractive index conditions are met between each neighboring pair.
This presentation is on dynamic light scattering characterization technique. DLS is cost effective size analysis method for nanoparticles and colloids.
Scanning probe microscopy, atomic force microscopy, contact, non contact, tapping modes, nanomechanics, lateral force microscopy, phase imaging, electric force microscopy, magnetic force microscopy, cantiliver fabrication and characterization, tip performance, force spectroscopy, force volume, nanoindentation, macromolecule unfolding, nanomechanical properties, cytomechanics
Modified Discrete Firefly Algorithm Combining Genetic Algorithm for Traveling...TELKOMNIKA JOURNAL
This document presents a modified discrete firefly algorithm combining genetic algorithm to solve the traveling salesman problem. The key points are:
1) It redefines the distance measure and location updating formula for the discrete firefly algorithm to avoid getting stuck in local optima.
2) It introduces genetic algorithm to initialize the population and includes a neighborhood search algorithm for further exploration.
3) Experimental results on benchmark problems show the new algorithm finds perfect solutions faster than other algorithms and significantly improves computational speed and reduces the number of iterations needed.
MEASUREMENT OF SCATTERING LOSSES OF LASER COMPONENTS BY TOTAL INTEGRATED SCAT...Simona Liukaityte
This document summarizes research on measuring scattering losses of laser components using the Total Integrated Scattering (TIS) method with different beam diameters. The study found that using smaller beam diameters (less than 0.4mm required by standards) increased the resolution of surface maps but also increased measurement durations and scattering loss values. Smaller beams made smaller defects and damages more visible. Beam diameters from 0.2mm to 1.12mm produced scattering loss measurements that varied within ±10% and are suitable for measurements.
Poster presentation I gave with one other student at the 2016 UO Undergraduate Research Symposium in collaboration with the Material Science Institute.
The document discusses various precision measurement instruments based on laser technology including laser interferometers, laser telemetric systems, laser and LED based distance measuring instruments, scanning laser gauges, and interferometry. Laser interferometers can measure lengths with high accuracy in the order of 0.1 μm over distances of 100m. Laser telemetric systems allow non-contact measurement of moving components. Scanning laser gauges can measure object diameters between 0.05mm to 450mm with accuracy of ±0.25 μm. Interferometry utilizes the interference of light waves to enable highly precise dimensional measurements.
This document summarizes an experiment on ultrafiltration and gel electrophoresis. For ultrafiltration, the goals were to understand membrane separation principles and parameters like osmotic pressure and fouling. Experiments tested filtration rate with different protein concentrations. Results showed osmotic pressure had a greater effect on mass transfer than fouling. For gel electrophoresis, the goals were to separate and measure molecular weights of pepsin and rennet using SDS-PAGE. Results showed crude pepsin, pure pepsin, and rennet-pepsin mixture were close to literature values, while rennet alone had some unexpected bands possibly from breakdown.
These images are practice shots for macro photography and landscape photography. The photographer took test shots for close-up macro photography as well as wide landscape shots. The goal was to practice different photography techniques and subjects.
This document summarizes an experiment on interference fringes using a sodium lamp as a monochromatic light source. Rays from the source were reflected through a plano convex lens and formed circular interference patterns known as Newton's rings on the glass surface. The width of the fringes could be measured using a traveling microscope and used to calculate the wavelength of light from the sodium lamp through a formula accounting for the air gap between the lens and glass surface. The circular fringes resulted from the plano-convex lens shaping the light waves into concentric rings.
The document describes an experiment to determine the separation between the plates of a Fabry Perot etalon. It provides background on the Fabry Perot interferometer and the principle of interference in the etalon. The experimental setup involves illuminating the etalon with a laser and measuring the angular diameters of interference fringes observed on a screen. By plotting the order of interference versus the cosine of the fringe angles and determining the slope, the separation between the etalon plates is calculated as approximately 2-3 mm, remaining constant despite varying the screen distance.
Magnetic nanoliposomes for combined hyperthermia and drug deliveryPriyank Kulshrestha
Thermosensitive Magnetic liposomes for combined hyperthermia and drug delivery
The document summarizes the development of thermosensitive magnetic liposomes containing iron oxide nanoparticles and the anticancer drug paclitaxel. The liposomes were characterized and found to release their drug payload when heated by an external alternating magnetic field via heat generated by the iron oxide nanoparticles. In vitro tests showed the magnetic liposomes were efficiently internalized by cancer cells and caused higher cytotoxicity when heated compared to untreated cells. The liposomes also showed potential for pulmonary delivery via nebulization with a portion depositing in the lungs. The system aims to provide localized hyperthermia and drug delivery for cancer treatment.
1) Diffraction refers to the spreading or bending of waves around edges, which results in a characteristic fringe pattern from a single slit consisting of alternating bright and dark fringes that fade from the center.
2) Interference patterns from thin films and multiple slits can be explained by the optical path difference between light waves reflecting or diffracting from different points, with constructive and destructive interference occurring at specific path differences.
3) A diffraction grating splits light into multiple beams at specific angles determined by the grating spacing and wavelength, allowing spectrometers to measure light wavelengths.
The index of refraction of air is approximately 1. The Brewster's angle θB is given by tanθB = n2/n1.
Plugging in the values given, we get:
tanθB = 1.52/1
θB = arctan(1.52) = 56.3°
Therefore, the Brewster's angle when the glass plate (n2 = 1.52) is in air (n1 = 1) is 56.3°.
The document discusses the phenomenon of diffraction, which is the bending of waves around barriers. Specifically, it states that (1) diffraction effects are greater for long wavelength waves and small holes, and (2) the double slit experiment demonstrates the principles of constructive and destructive interference patterns from wave diffraction. Sample problems are also provided to calculate diffraction fringe spacing and wavelength using the double slit experiment.
1) Fresnel's theory of diffraction explains that diffraction occurs due to the interference of secondary wavelets produced by unobstructed portions of the wavefront.
2) When considering the diffraction pattern at a point P, Fresnel divided the wavefront into concentric half-period zones centered on the point's pole O. The contribution of each zone to the intensity at P depends on the zone's area and distance from P.
3) For a large number of zones, the total intensity at P is approximately one fourth of that due to the first zone alone, explaining the dimming of light in diffraction patterns.
This document discusses the phenomenon of diffraction - how light bends or spreads when encountering an obstacle or opening. It provides details on diffraction patterns created by single slits, edges, and gratings. Key points covered include the characteristics of diffraction patterns such as bright and dark bands, as well as the differences between Fresnel and Fraunhofer diffraction based on the distances between the light source, obstacle, and viewing screen. Equations for determining the positions of maxima and minima in diffraction patterns are also presented.
The document describes the concept of diffraction of waves. It discusses how diffraction causes waves to bend or spread out when passing through an obstacle or gap. It provides examples of diffraction of water waves and discusses how the degree of diffraction depends on factors like the size of the obstacle or gap relative to the wavelength. The document also discusses how diffraction causes the shape, direction and amplitude of waves to change while keeping the wavelength and frequency the same. It poses sample questions assessing understanding of diffraction concepts.
This document discusses the principles and phenomena of diffraction. It begins by defining diffraction as the deviation of light from rectilinear propagation that occurs when a portion of a wavefront is obstructed. The Huygens-Fresnel principle is introduced, which states that every point on a wavefront acts as a secondary source of spherical wavelets. Diffraction patterns can be classified as either Fraunhofer or Fresnel diffraction depending on the separation between the aperture and viewing screen. Examples of diffraction from single slits, circular apertures, and double slits are analyzed. Rayleigh's criterion for resolving power with rectangular apertures is also described.
This document discusses the principles and types of diffraction, including Fraunhofer and Fresnel diffraction. It explains diffraction at a single slit and double slit, describing how the diffraction patterns are formed and the conditions for maxima and minima. It also discusses the differences between interference and diffraction. Finally, it discusses diffraction gratings and their uses in spectroscopy.
This document summarizes key concepts in wave optics, including:
1. Diffraction occurs when light bends around obstacles and into regions of geometric shadows. Diffraction patterns from a single slit include a central maximum surrounded by alternating dark and bright fringes whose angles follow mathematical formulas.
2. The theory of diffraction is based on the principle of interference of secondary wavelets emerging from different parts of a wavefront.
3. Polarization of light waves occurs as the electric field oscillates perpendicular to the direction of propagation, and polarizers and analyzers can be used to study polarized light according to Malus' Law.
The term Diffraction has been defined by Sommerfield as any deviation of light rays from rectilinear paths which cannot be interpreted as reflection or refraction.
For comments please connect me at solo.hermelin@gmail.com.
For more presentations on different subjects visit my website at http://www.solohermelin.com. This presentation is in the Optics folder.
Ch 27 interference & wave nature of light onlineScott Thomas
The document discusses key concepts related to the wave nature of light and interference and diffraction phenomena:
1) Interference occurs when two light waves pass through a point and their electric fields combine according to the principle of superposition, resulting in constructive or destructive interference depending on whether the waves are in or out of phase.
2) Young's double-slit experiment demonstrates interference, producing bright and dark fringes on a screen from the constructive and destructive interference of light passing through two slits.
3) Thin-film interference results from the multiple reflections within a thin film, leading to either constructive or destructive interference depending on the path length differences and refractive indices of the materials.
This document discusses the diffraction of light. It begins by describing the objectives of understanding how light waves bend around obstacles, calculating the positions of fringes in a diffraction grating, and how diffraction determines an optical instrument's ability to resolve images. It then explains Huygens' principle that every point on a wavefront can be seen as a secondary source of waves. It discusses how diffraction causes light to bend when passing through an opening or slit and describes Thomas Young's double slit experiment that demonstrated the wave-like nature of light. It concludes by mentioning how a diffraction grating is used to show the colors of white light and that Young observed bright and dark fringes caused by the interference of light recombined from two slits.
Diffraction is the bending of light waves as they pass from one medium to another. When light passes through an aperture or slit, it produces a diffraction pattern of alternating light and dark fringes. The size of the aperture determines the extent to which light bends and the ability of an optical instrument like a camera to resolve fine image details, with smaller apertures resulting in more diffraction and less resolution. Diffraction limits the resolving power of lenses and explains why images may appear blurred if the aperture is too large compared to the wavelength of light.
When waves encounter obstacles like slits, they diffract or bend around the edges. Diffraction can be explained by Huygens' principle, which says each point on a wavefront acts as a new source. For a single slit, the new wavefront shape is determined by combining spherical wavelets from points across the slit. There are two types of diffraction: Fresnel, where distances are finite, and Fraunhofer, where incident waves are plane waves. X-ray diffraction uses wavelengths comparable to atomic sizes to determine crystal and molecular structures.
- Diffraction occurs when waves pass through small openings, around obstacles, or by sharp edges. This causes the waves to spread out after passing through the openings.
- A single slit placed between a light source and screen produces a diffraction pattern of alternating bright and dark bands called interference fringes. The spacing and intensity of the fringes depends on the wavelength of light and the width of the slit.
- In single-slit diffraction, each part of the slit acts as a secondary source, and the light interferes depending on the path differences between waves, causing constructive and destructive interference at different angles.
This document discusses approaches for improving nonuniformity correction (NUC) for resistive array infrared scene projectors. Current NUC schemes treat each pixel independently, but scene-based effects like power drops and thermal crosstalk across the array are important to consider. The document examines potential problems with scene-based correction and discusses algorithms that could be used, such as accounting for far-field diffraction effects between pixels. It also describes the current sparse array approach used to measure each pixel's response and derive nonuniformity correction curves.
Ellipsometry- non destructive measuring methodViji Vijitha
Ellipsometry is a non-destructive optical technique that measures the change in polarization state of light upon reflection from or transmission through a sample. It can be used to characterize properties like thickness, composition, and crystallinity of thin films. The document discusses the history and principles of ellipsometry, experimental setups, data analysis techniques using modeling to extract sample properties, and applications in measuring films. Modeling involves using equations to describe light-material interactions and minimizing errors between calculated and measured polarization states.
Optical sensing techniques and signal processing 5ali alavi
This document discusses frequency analysis of optical imaging systems. It begins with a generalized treatment of imaging systems and defines the amplitude transfer function and impulse response. For coherent systems, the image is a convolution of the ideal image and amplitude impulse response. For incoherent systems, the image intensity is a convolution with the intensity impulse response, which is the squared amplitude impulse response. It then examines the frequency responses of coherent and incoherent systems, defining the amplitude transfer function and optical transfer function respectively.
The document reports on experiments measuring the interaction of a gravity impulse beam with light and determining the propagation speed of the gravity impulse. The key findings are:
1) Laser light intensity was found to decrease by 2.8-7.5% for 34-48 ns when interacting with the gravity beam, with attenuation increasing with discharge voltage.
2) The propagation time of the gravity impulse over 1211 m, as measured by piezoelectric sensors connected to atomic clocks, was 63±1 ns, corresponding to a speed of (64±1)c.
3) Theoretical analysis suggests the beam consists of virtual particles with finite lifetimes. Different targets may absorb components propagating at different velocities, complic
The document summarizes a new algorithm for noise reduction and quality improvement in SAR interferograms using inpainting and diffusion. It presents an inpainting-diffusion algorithm to improve interferogram quality and DEM accuracy. It then describes applying the Complex Ginzburg-Landau equation to the inpainting scheme for SAR interferogram restoration. The algorithm uses inpainting to fill in discarded phase values below a threshold of coherence. It evaluates the algorithm's performance using Signal-to-Noise Ratio on an interferogram of Ariano Irpino, Italy.
The document summarizes research determining the optical constants and thickness of tin oxide (SnO2) thin films. Ellipsometry was used to measure the delta and psi values of the thin film coated on a glass substrate. Software analysis of the ellipsometry data found the refractive index of the SnO2 film to be 1.517 and the thickness to be 250 nm. Additional modeling of the complex dielectric function was also discussed to better understand the optical properties of conductive thin films like SnO2.
This document discusses Fourier transform infrared spectroscopy (FTIR) and its application in analyzing polydimethylsiloxane (PDMS). It begins with an introduction to FTIR, describing how it uses Fourier transforms to measure infrared absorption spectra. It then covers the basic concepts of FTIR including Michelson interferometers, Fourier transforms, and advantages over dispersive spectrometers. Applications discussed include chemical reaction analysis and surface functional group analysis. It provides an example using FTIR to analyze the reaction mechanism of photo-defined PDMS.
This document describes research on using near-infrared optical imaging techniques for 3D biological tissue imaging. It discusses diffuse optical tomography (DOT) and fluorescence DOT (F-DOT). For DOT, it covers the photon diffusion equation, forward and inverse models, and finite element method implementation. For F-DOT, it discusses the fluorescence transport equations and parallel inversion schemes. Simulation results using MATLAB and NIRFAST show reconstructed optical property maps and fluorescence distributions in 2D and 3D geometries. Future work aims to further develop 3D imaging software for interfacing with DOT instrumentation.
Experimental Study of Third Order Nonlinear Absorption in Pure and MG Doped L...ijtsrd
With the discovery of laser in 1960 various nonlinear effect arises, the origin of nonlinear optics lies in the nonlinear response of materials to the incident coherent radiation. Using pulsed Q switched Nd YAG Laser, we have observed the important phenomena i.e. third order nonlinear effect in the LiNbO3 crystals. In present work, I have performed an experiment using simple and sensitive single beam Z scan technique to measure nonlinear absorption in LiNbO3 crystals samples such as pure LiNbO3 crystal, 5mol Mg doped LiNbO3 crystal, and 7mol Mg doped LiNbO3 crystal. Vijay Aithekar | Dr. Vishal Saxana "Experimental Study of Third Order Nonlinear Absorption in Pure and MG Doped Lithium Niobate Crystals" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-6 , October 2019, URL: https://www.ijtsrd.com/papers/ijtsrd26370.pdf Paper URL: https://www.ijtsrd.com/physics/engineering-physics/26370/experimental-study-of-third-order-nonlinear-absorption-in-pure-and-mg-doped-lithium-niobate-crystals/vijay-aithekar
- Intermodulated differential immittance spectroscopy (IDIS) is a nonlinear analysis technique that uses two input frequencies (a probe and stimulus signal) to perturb an electrochemical system.
- For a nonlinear system, the output contains not only the probe and stimulus frequencies but also sidebands located at the sum and difference of the frequencies, due to intermodulation.
- The technique defines a transfer function called the differential immittance spectrum, which can be calculated from the sideband amplitudes. This provides information about the system's nonlinearity.
- Testing on a Schottky diode showed that the differential immittance spectrum could accurately determine the diode's flat band voltage and doping level from a single measurement.
The optical constants of highly absorbing films using the spectral reflectanc...Alexander Decker
This document summarizes a study that determined the optical constants of thin rhodium films using spectral reflectance measurements. The study used Kramers-Kronig relations to calculate the phase angle from reflectance measurements. This allowed determining the real refractive index. The extinction coefficient was then estimated using equations relating reflectance, refractive index, and film thickness. The determined optical constants compared well to values from an interference method. The method provides an accurate way to determine optical constants of highly absorbing thin films using normal incidence reflectance measurements alone.
Dynamic light scattering can be used to measure the diffusion of small particles undergoing Brownian motion. An experiment is described that uses a laser, sample cell containing diffusing particles, lenses, photodetector, and photon correlator. The photodetector records the scattered light as pulses, which are clustered for moving particles due to the Doppler effect. The photon correlator measures the intensity correlation function over time to determine the decay time of fluctuations, which relates to particle size and diffusion coefficient according to equations presented. Dynamic light scattering is a powerful technique for studying phenomena involving fluctuations at the microscopic scale.
This document summarizes a study that demonstrates the use of equally-sloped tomography (EST) to improve electron tomography reconstruction. EST acquires projection images at constant slope increments, allowing the use of a pseudo-polar fast Fourier transform to directly relate the projection and volume grids. The study applied EST to reconstruct frozen keyhole limpet hemocyanin molecules and a bacterial cell from tilt-series data. EST reconstructions exhibited higher contrast, less noise, clearer boundaries, and reduced missing wedge effects compared to other reconstruction methods. Surprisingly, EST reconstructions using only two-thirds of the original projections appeared to have the same resolution as full reconstructions using other methods, suggesting EST can reduce radiation dose requirements or allow higher resolutions.
Development of Nonlinear Optical Microscope and ScannerRohan Sharma
For my internship at the Femtosecond Spectroscopy & Nonlinear Optics Lab at IIT Delhi, I worked on the development of nonlinear optical microscope and scanner for 10 weeks.During the internship, I developed a multimodal nonlinear optical microscope employing white light and femtosecond laser to record the optical imaging, transmission imaging as well as the second harmonic generation (SHG) imaging of a sample.
This document presents Kendi Muchungi's PhD thesis on rod-cone convergence in the retina. The thesis includes:
1) An introduction to the participating neurons in the retina and existing models of light adaptation and contrast gain control.
2) Research questions on how rod-cone convergence affects light adaptation and contrast gain control, and how this convergence could be exploited.
3) Details of the author's biologically inspired computational model of the retina that incorporates rod influence through rod-cone coupling and feedback from horizontal and amacrine cells.
4) Evaluation of the model showing it can replicate biological responses to variations in light intensity and contrast.
5) Analysis demonstrating the significance of rod influence in improving
Probing the solar coronal magnetic field with physics-informed neural networksSérgio Sacani
While the photospheric magnetic feld of our Sun is routinely measured,
its extent into the upper atmosphere is typically not accessible by direct
observations. Here we present an approach for coronal magnetic-feld
extrapolation, using a neural network that integrates observational data
and the physical force-free magnetic-feld model. Our method fexibly
fnds a trade-of between the observation and force-free magnetic-feld
assumption, improving the understanding of the connection between
the observation and the underlying physics. We utilize meta-learning
concepts to simulate the evolution of active region NOAA 11158. Our
simulation of 5 days of observations at full cadence (12 minutes) requires
less than 12 hours of total computation time, allowing for real-time
force-free magnetic-feld extrapolations. The application to an analytical
magnetic-feld solution, a systematic analysis of the time evolution of free
magnetic energy and magnetic helicity in the coronal volume, as well as
comparison with extreme-ultraviolet observations, demonstrates the
validity of our approach. The obtained temporal and spatial depletion of
free magnetic energy unambiguously relates to the observed fare activity.
Identification of the Memory Process in the Irregularly Sampled Discrete Time...idescitation
This poster paper analyzes the memory process in the irregularly sampled daily solar radio flux signal between 1972-2013. The authors apply Savitzky-Golay filtering to denoise the signal, then use Finite Variance Scaling Method and Hurst exponent analysis to investigate the memory pattern. Their analysis finds the signal exhibits short memory behavior, suggesting it may have multi-periodic or pseudo-periodic characteristics. This provides insight into the internal dynamics and particle acceleration processes of the Sun.
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This document describes an experiment that demonstrates sub-Rayleigh resolution in imaging by using N-photon detection with a single-photon avalanche detector array. A focused laser beam is scanned over an object in an arbitrary pattern unknown to the imager. Pixels registering exactly N photon counts are used to form an image, improving resolution by a factor of (N - maximum average photon number)1/2 beyond the Rayleigh diffraction limit. The experiment images a resolution target and resolves stripes below the Rayleigh resolution with N=23 photon detection, in agreement with theory.
The Chaos and Stability of Firefly Algorithm Adjacent IndividualTELKOMNIKA JOURNAL
In this paper, in order to overcome the defect of the firefly algorithm, for example, the slow
convergence rate, low accuracy and easily falling into the local optima in the global optimization search,
we propose a dynamic population firefly algorithm based on chaos. The stability between the fireflies is
proved, and the similar chaotic phenomenon in firefly algorithm can be simulated.
How to Manage Your Lost Opportunities in Odoo 17 CRMCeline George
Odoo 17 CRM allows us to track why we lose sales opportunities with "Lost Reasons." This helps analyze our sales process and identify areas for improvement. Here's how to configure lost reasons in Odoo 17 CRM
A workshop hosted by the South African Journal of Science aimed at postgraduate students and early career researchers with little or no experience in writing and publishing journal articles.
The simplified electron and muon model, Oscillating Spacetime: The Foundation...RitikBhardwaj56
Discover the Simplified Electron and Muon Model: A New Wave-Based Approach to Understanding Particles delves into a groundbreaking theory that presents electrons and muons as rotating soliton waves within oscillating spacetime. Geared towards students, researchers, and science buffs, this book breaks down complex ideas into simple explanations. It covers topics such as electron waves, temporal dynamics, and the implications of this model on particle physics. With clear illustrations and easy-to-follow explanations, readers will gain a new outlook on the universe's fundamental nature.
ISO/IEC 27001, ISO/IEC 42001, and GDPR: Best Practices for Implementation and...PECB
Denis is a dynamic and results-driven Chief Information Officer (CIO) with a distinguished career spanning information systems analysis and technical project management. With a proven track record of spearheading the design and delivery of cutting-edge Information Management solutions, he has consistently elevated business operations, streamlined reporting functions, and maximized process efficiency.
Certified as an ISO/IEC 27001: Information Security Management Systems (ISMS) Lead Implementer, Data Protection Officer, and Cyber Risks Analyst, Denis brings a heightened focus on data security, privacy, and cyber resilience to every endeavor.
His expertise extends across a diverse spectrum of reporting, database, and web development applications, underpinned by an exceptional grasp of data storage and virtualization technologies. His proficiency in application testing, database administration, and data cleansing ensures seamless execution of complex projects.
What sets Denis apart is his comprehensive understanding of Business and Systems Analysis technologies, honed through involvement in all phases of the Software Development Lifecycle (SDLC). From meticulous requirements gathering to precise analysis, innovative design, rigorous development, thorough testing, and successful implementation, he has consistently delivered exceptional results.
Throughout his career, he has taken on multifaceted roles, from leading technical project management teams to owning solutions that drive operational excellence. His conscientious and proactive approach is unwavering, whether he is working independently or collaboratively within a team. His ability to connect with colleagues on a personal level underscores his commitment to fostering a harmonious and productive workplace environment.
Date: May 29, 2024
Tags: Information Security, ISO/IEC 27001, ISO/IEC 42001, Artificial Intelligence, GDPR
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LAND USE LAND COVER AND NDVI OF MIRZAPUR DISTRICT, UPRAHUL
This Dissertation explores the particular circumstances of Mirzapur, a region located in the
core of India. Mirzapur, with its varied terrains and abundant biodiversity, offers an optimal
environment for investigating the changes in vegetation cover dynamics. Our study utilizes
advanced technologies such as GIS (Geographic Information Systems) and Remote sensing to
analyze the transformations that have taken place over the course of a decade.
The complex relationship between human activities and the environment has been the focus
of extensive research and worry. As the global community grapples with swift urbanization,
population expansion, and economic progress, the effects on natural ecosystems are becoming
more evident. A crucial element of this impact is the alteration of vegetation cover, which plays a
significant role in maintaining the ecological equilibrium of our planet.Land serves as the foundation for all human activities and provides the necessary materials for
these activities. As the most crucial natural resource, its utilization by humans results in different
'Land uses,' which are determined by both human activities and the physical characteristics of the
land.
The utilization of land is impacted by human needs and environmental factors. In countries
like India, rapid population growth and the emphasis on extensive resource exploitation can lead
to significant land degradation, adversely affecting the region's land cover.
Therefore, human intervention has significantly influenced land use patterns over many
centuries, evolving its structure over time and space. In the present era, these changes have
accelerated due to factors such as agriculture and urbanization. Information regarding land use and
cover is essential for various planning and management tasks related to the Earth's surface,
providing crucial environmental data for scientific, resource management, policy purposes, and
diverse human activities.
Accurate understanding of land use and cover is imperative for the development planning
of any area. Consequently, a wide range of professionals, including earth system scientists, land
and water managers, and urban planners, are interested in obtaining data on land use and cover
changes, conversion trends, and other related patterns. The spatial dimensions of land use and
cover support policymakers and scientists in making well-informed decisions, as alterations in
these patterns indicate shifts in economic and social conditions. Monitoring such changes with the
help of Advanced technologies like Remote Sensing and Geographic Information Systems is
crucial for coordinated efforts across different administrative levels. Advanced technologies like
Remote Sensing and Geographic Information Systems
9
Changes in vegetation cover refer to variations in the distribution, composition, and overall
structure of plant communities across different temporal and spatial scales. These changes can
occur natural.
How to Make a Field Mandatory in Odoo 17Celine George
In Odoo, making a field required can be done through both Python code and XML views. When you set the required attribute to True in Python code, it makes the field required across all views where it's used. Conversely, when you set the required attribute in XML views, it makes the field required only in the context of that particular view.
Walmart Business+ and Spark Good for Nonprofits.pdfTechSoup
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Walmart Business+ and Spark Good for Nonprofits.pdf
73.1 s
1. Analysis of Intensity of CD
Diffraction Pattern using
Fraunhofer Single Slit Diffraction
Karl Arwen Cereno1, Leomark Responde1, Mark Joshua Salvacion2 and Jan
Carlo Frayre3
1 Institute of Civil Engineering, College of Engineering
2 Department of Geodetic Engineering, College of Engineering
3Department of Curriculum and Instruction, College of Education
University of the Philippines, Diliman, Quezon City 1101 Philippines
2. Abstract
In this experiment, the consistency of the
formula for intensity will be analyzed. The
method to be used includes calculating the
angle of diffraction given that there is a prior
value for a given intensity. The intensity is then
plotted and the graph is compared to the
theoretical plot of the Fraunhofer Single Slit
Diffraction. The result shows that the data
follows the theory. Because of the
approximation method used in calculating for a
given intensity, errors and deviations will be
accounted accordingly.
3. Introduction
The wave nature of light can be demonstrated
clearly by observing the interference and diffraction of
light as it passes through slits. Diffraction manifests
itself in the apparent bending of waves around small
obstacles and the spreading out of waves past small
openings. (Include fraunhofer equation, and graph)
For single-slit diffraction, the slit width can be
measured using the measurements of the diffraction
pattern. If a monochromatic light approaching the
diffracting object is parallel and the image plane is at a
distance large enough compared to the diffracting
object, the situation is of the Fraunhofer Diffraction. The
intensity of the mth fringe can then be calculated.
5. METHODOLOGY
This experiment was conducted to verify the
functionality of the Franhoufer diffraction
equation that relates the intensity of light on the
mth order bright band and its angular distance
from the central bright band.
Figure 1 shows the experimental set up
7. METHODOLOGY
The angle of incidence of the incoming light is roughly
normal to the CD.
The plane of the screen is set parallel to the plane of the
CD.
The intensity of the bright bands on the diffraction
pattern was measured using a light sensor.
Measurements are recorded in Data Table 1.
8. RESULTS
Data Table 1
y
m
(cm)
-2 - - - -
-1 345 30.8 26.42
0 1361 (Gauge the ‘D’ value. Does it fit the Fraunhofer
equation????)
1 273 30.8 26.42
2 - - - -
D = 62 cm a = 1.67 μm
λ = 650 nm Io = 1361 lux
9. RESULTS
There is a significant difference between the
measured Intensity on the m=1 band and the m=-1
band.
The 2nd order bright bands are observable but the
intensities are not measurable using the light
sensor.
10. CONCLUSION
The behavior of the plotted graph follows the theoretical
behavior of the I/Io vs β (figure 3).
The function that will best fit the data points cannot be
derived due to the limits of the graphing tool (Microsoft
Excel).
11. Conclusion
(Use the measurements
to generate a plot
following the Fraunhofer
equation)
Figure 3 Intensity of the Single slit
Fraunhofer diffraction pattern
12. RESULTS
Graph of the ratio of the mth intensity/maximum
intensity versus β/2 (phase difference)
1.2
(Superimpose the
1
Experimental and
0.8 Theoretical graphs)
0.6
I/Io
0.4
0.2
0
-2 -1.5 -1 -0.5 0 0.5 1 1.5 2 (Factor: π)
-0.2
mπ
Figure 2
13. CONCLUSION
The values of the measured intensity was highly
affected by the following errors.
Instrument error
Procedural error
Human error
14. Acknowledgements
The researchers would like to express utmost
gratitude to the National Institute of Physics of the
University of the Philippines – Diliman for the academic
support and the privilege that they have
given, especially on the use of the laboratory and the
Lab Manuals that were provided. And ultimately, the
researchers would like express gratitude to Professor
Gerold Pidemonte for his support, encouragement and
assistance in this experiment.
(Change ‘Pidemonte’ to ‘P-E-demonte’ and Add Romy
Abaniel)
15. References
1. Lab Manual Authors, Physics 72.1 Laboratory Manual, 2007
2. Young, H., Freedman, R., “Sears and Zemansky’s University
Physics: with Modern Physics” 12th ed, Chapter 36, Pearson
Addison-Wesley, 1301 Sansome St., San Francisco, CA
94111, 2008
3. Nave,C.R., “HyperPhysics”, hyperphysics.phy-astr.gsu.edu, 2010
4. Department of Physics and Astronomy, “Fraunhofer Diffraction
with a Laser Source”, The University of
Sheffield, Sheffield.ac.uk, 2008
5. Tippie, A., Lee, T., “Experiment with Diffraction”, 2008