A portable remote methane sensor using a tunable diode laser
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A portable remote methane sensor was developed using a tunable diode laser operating at 1.65 μm. It uses lidar with a range of up to 10 m to scan for methane leaks. The sensor achieves high sensitivity through second-harmonic detection and frequency-modulation spectroscopy, allowing it to detect methane concentrations of 450 ppb over 6 m with a 100 ms time constant. Tests show it can identify small gas leaks of about 10 cm3/min from several meters away.
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1. NMR can identify hydrocarbon deposits like oil and gas to depths of up to 5 km without drilling or interpretation, unlike traditional NMR well logging which only reaches 200m.
2. NMR works by emitting a directional signal tuned to the resonance frequency of the desired substance (e.g. oil, gas) and detecting the re-emitted signal on the surface.
3. NMR surveys can identify and delineate deposits over tens of thousands of square km with over 90% accuracy, significantly exceeding the capabilities of modern seismography. This allows reducing exploration costs.
111
Carbon nanotube sensors are promising due to their unique properties like electrical conductivity and strength. The document discusses different types of carbon nanotube sensors including gas ionization sensors that detect gases by measuring breakdown voltage. Emerging applications include chemical sensors using carbon nanotube field effect transistors coated with DNA to detect toxins. Future directions include developing intelligent sensors that can optimize themselves and wireless sensors incorporated into robotic fish to detect pollution in the environment.
Primary functions of cognitive radio
The primary functions of cognitive radio include power control, spectrum sensing using various techniques like transmitter detection, matched filter detection, energy detection, and cyclostationary feature detection. It also includes spectrum management, wideband spectrum sensing, and cooperative detection. Spectrum sensing techniques can be categorized into transmitter detection using methods like matched filtering and energy detection. Energy detection measures signal power to detect presence/absence but requires knowledge of noise variance while cyclostationary feature detection exploits unique features of communication signals. Wideband sensing and cooperative detection are also discussed.
RCE Schottky Photo Detector
This document discusses resonant-cavity-enhanced Schottky photodetectors (RCE photodetectors). RCE photodetectors improve performance over conventional photodetectors by placing the active device structure inside an optical cavity formed by parallel mirrors. This cavity structure provides wavelength selectivity and enhances the optical field, allowing thinner, faster devices with higher quantum efficiency. Key advantages of RCE photodetectors include higher quantum efficiency, higher detection speed, and wavelength selective detection. Materials like GaAs, AlGaAs, InGaAs are used to construct these devices for applications in optical communications.
Near Infrared & Raman Spectroscopy.pdf
Near infrared reflectance spectroscopy (NIRS) is a nondestructive and rapid technique applied increasingly for food quality evaluation in recent years.
The most wide spread use of NIRS has been for determination of protein, moisture, starch, lipids, ash, oil, and salts.
NIR spectroscopy utilizes the spectral range from 780 to 2500 nm and provides much more complex structural information related to the vibration behavior of combination of bonds.
CLaDS Marblar Feb 13
This document describes infrared absorption spectroscopy and a new dispersion technique called CLaDS. CLaDS relies on measuring the dispersion of a dual beam laser rather than direct absorption. This provides several advantages over other techniques including high sensitivity down to parts per billion, a linear response over a wide dynamic range, and immunity to fluctuations in light intensity. Potential applications of CLaDS include atmospheric monitoring, combustion analytics, medical diagnostics, and remote open path detection due its unique capabilities.
performance and specifications of spectrophotometer
Spectrophotometers measure the intensity of light at specific wavelengths to determine the concentration of compounds in solution. They consist of a light source, wavelength selector like a monochromator, cuvette to hold samples, photodetector like a photomultiplier tube, readout device, and data system. For accurate results, spectrophotometers must meet various performance specifications including wavelength accuracy checked using holmium oxide or didymium filters, low stray light verified with cutoff filters, linear detector response across concentration ranges, and photometric accuracy assessed using neutral density filters.
Advanced Sensor Tech : SpectRx™ , Lightning Speed & Hardness Test Game Changer
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Precision(Concentration): 0.01%
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ultra wide band radar stystem.pptx vcbcvvvvvczccz
This document describes an ultra wide band radar system for detecting human vital signs through walls. It uses Doppler radar to identify breathing movements behind barriers. The system aims to detect stationary human targets using short time Fourier transform analysis and singular value decomposition to reduce clutter. It compares existing harmonic pulse radar methods to the proposed UWB system, which can provide high range resolution and penetrate barriers. The document outlines the hardware and software used, including an Arduino, Doppler sensor, IR temperature sensor, and MATLAB. It analyzes the results and discusses applications in search and rescue, surveillance, and detecting humans in enclosed spaces.
Infrared absorption spectroscopy
Infrared absorption spectroscopy can be used to analyze both organic and inorganic compounds. It utilizes three infrared regions - near, mid, and far infrared. The document discusses the instrumentation used in infrared spectroscopy, including infrared radiation sources, monochromators, sample cells, and detectors. It also covers sample preparation techniques for solids, liquids, and gases. Infrared spectroscopy has various applications such as quality control, forensic analysis, polymer analysis, and semiconductor analysis.
Simultaneous Measurement of N2O and CH4 Emissions from Agriculture Using Phot...
Scientific presentation at Pittcon Conference 2016, Atlanta, 7th of March by Gasera Ltd.
http://www.gasera.fi/
raman spectroscopy 2.pptx
Raman spectroscopy is a spectroscopic technique used to observe vibrational modes of a system. It relies on inelastic scattering of monochromatic light, usually from a laser. When light interacts with molecules, the light may be scattered elastically (Rayleigh scattering) or inelastically (Raman scattering). A Raman spectrometer consists of a laser, filters, sample optics, monochromator, and detector. Raman spectra provide a fingerprint that can be used to identify molecules based on their vibrational energies. Compared to infrared spectroscopy, Raman spectroscopy can analyze solids, liquids, and gases and is not interfered by water. It has applications in chemistry, biology, and materials analysis.
Calibrationfinal
The document discusses calibration of radiometric detectors. It explains that metrology labs purchase calibrated transfer standard detectors from NIST that are then used to calibrate the lab's working standards. The working standards are calibrated using a monochromatic light source and are rotated, tracked, and recalibrated over time. Detectors are usually calibrated at the peak wavelength of the intended application using identical optics. An uncertainty of 10% or less is considered good for radiometry equipment, while NIST can achieve 1% uncertainty.
Aavos international - process analysis
AAVOS International bvba has a wide range of online process instrumentation for many applications in chemical, petrochemical, oil, gas, food, beverage and pharmaceutical industry.
We will advise you to find the right equipment for your analysis of fluids, gasses and solids.
Process on-line analysers are offered as a solution to the efficiency of plant operation and offer huge paybacks. Our analysers are also applied for monitoring emissions and as safety measurement. http://aavos.be
Detection of Drugs with Cantilever-Enhanced Photoacoustic Spectroscopy
Two projects in FP7 program: CUSTOM and DOGGIES
One project in H2020 program: IRON
Measurements with hair samples.
Detection of drugs in hair.
Micro-sample studies.
Solid phase drug measurement.
FTIR-PAS measurement of cannabis.
Distance Sensors
The document discusses different types of distance sensors and their key characteristics. Short-range sensors like ultrasonic sensors can measure up to 100m, while long-range laser sensors can measure over 30m without a reflector or up to 100m with one. Other discussed sensors include triangulation laser sensors, profile scanner lasers, potentiometers, cable-extension sensors, magnetostrictive sensors, magnetoresistive sensors, linear encoders, and LVDT inductive sensors. Applications mentioned include various industrial machinery, air traffic control, and medicine.
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performance and specifications of spectrophotometer
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A portable remote methane sensor using a tunable diode laser
- 1. A portable remote methane sensor using a tunable diode laser | ISweek - Industry sourcing A portable remote methane sensor using a 1.65 µm InGaAsP distributed-feedback laser is developed. It is designed as a man-portable long-path absorption lidar using a topographical target with a range of up to about 10 m. An operator can search for gas leaks easily by scanning the laser light. High sensitivity is accomplished by means of second-harmonic detection using frequency-modulation spectroscopy. The experimental detection limit (signal-to-noise ratio = 1) with a diffusive target of magnesium oxide (6 m range, normal incidence) is 450 ppb m with a time constant of 100 ms. Measurements of the reflectance of real targets show that the sensor can distinguish small gas leaks (typically 10 cm3 min -1 ) within a range of several metres. ISweek（http://www.isweek.com/）- Industry sourcing & Wholesale industrial products