The document discusses several acoustic instruments - ADCP, ADV, and DVL - that use the Doppler effect to measure water velocity. It describes the operating principles of each, including how they function, the type of data they collect, and examples of use. The conclusion compares the instruments' accuracy, advantages, and limitations.
This document discusses improvements in nitrogen dioxide (NO2) measurement technology. It describes weaknesses in the traditional chemiluminescence method, such as indirect NO2 measurement and susceptibility to drift. The document then introduces the T500U analyzer, which measures NO2 directly using cavity attenuated phase shift technology, without conversions or ambient interferences. Maintenance of the T500U is minimal, involving annual filter changes and biennial pump replacement. It offers enhanced specifications compared to previous analyzer models.
Neutron noise-based core monitoring techniques are being developed to detect anomalies in operating nuclear reactors. The CORTEX project aims to advance these techniques by developing simulation tools, validating them with experiments, and applying advanced signal processing methods. This will help characterize anomalies and their root causes to improve reactor monitoring and safety. The CORTEX consortium includes experts from 17 European organizations and will work towards demonstrating these techniques using data from operating plants.
This three day course is intended for practicing systems engineers who want to learn how to apply model-driven systems Successful systems engineering requires a broad understanding of the important principles of modern spacecraft communications. This three-day course covers both theory and practice, with emphasis on the important system engineering principles, tradeoffs, and rules of thumb. The latest technologies are covered. <p>
Fundamentals of Passive and Active Sonar Technical Training Short Course SamplerJim Jenkins
This four-day course is designed for SONAR systems engineers, combat systems engineers, undersea warfare professionals, and managers who wish to enhance their understanding of passive and active SONAR or become familiar with the "big picture" if they work outside of either discipline. Each topic is presented by instructors with substantial experience at sea. Presentations are illustrated by worked numerical examples using simulated or experimental data describing actual undersea acoustic situations and geometries. Visualization of transmitted waveforms, target interactions, and detector responses is emphasized.
The document summarizes tests conducted on commercial video processors (CSPs) to evaluate their suitability for use in space applications. Preliminary tests on 5 CSP candidates from 2 manufacturers led to the selection of 1 part based on latchup sensitivity and electrical performance. Further lot evaluation tests included electrical characterization over temperature, dynamic life testing, and radiation tests for total ionizing dose and single event effects. The goal was to determine if the selected commercial CSP could be recommended for use in space payloads.
This document proposes using random pulse timing in synthetic aperture radar (SAR) imaging to achieve high azimuth resolution while maintaining full ground range coverage. It describes how compressive sensing allows for undersampling by mixing missing data through randomization. An iterative reconstruction algorithm is used to incorporate the sparsity prior and reconstruct high-resolution SAR images from randomly sampled radar echo data. Simulation results using synthetic data demonstrate the approach can produce images with improved azimuth resolution compared to uniform pulse timing schemes.
The document is a lecture on radar antennas and discusses various antenna scanning techniques. It begins with an overview of radar systems and the radar equation. It then covers antenna fundamentals and different types of mechanical, electronic and hybrid scanning antennas used in radar systems. The lecture outlines electronic scanning with phased arrays, including linear and planar array beamforming. It discusses controlling the array pattern through element excitation phases and amplitudes. Properties of linear arrays like beamwidth and sidelobes are also covered. The document provides examples of increasing array gain by adding more elements.
Open Annotation in the CHARMe Project for the I Annotate Conference Raquel Alegre
- The document discusses the CHARMe project, which uses open annotation to share knowledge about climate datasets and help users assess their fitness for purpose.
- Open annotation is a natural fit for CHARMe as it allows recording of motivations, tags, and multiple annotation targets.
- CHARMe will create connected repositories of commentary information stored as triples in "CHARMe nodes" that can be accessed through websites or services.
- Some advanced use cases for annotating climate data include discussing the timing of events, tracing plankton blooms, and identifying features in subsets of multidimensional climate datasets.
This document discusses improvements in nitrogen dioxide (NO2) measurement technology. It describes weaknesses in the traditional chemiluminescence method, such as indirect NO2 measurement and susceptibility to drift. The document then introduces the T500U analyzer, which measures NO2 directly using cavity attenuated phase shift technology, without conversions or ambient interferences. Maintenance of the T500U is minimal, involving annual filter changes and biennial pump replacement. It offers enhanced specifications compared to previous analyzer models.
Neutron noise-based core monitoring techniques are being developed to detect anomalies in operating nuclear reactors. The CORTEX project aims to advance these techniques by developing simulation tools, validating them with experiments, and applying advanced signal processing methods. This will help characterize anomalies and their root causes to improve reactor monitoring and safety. The CORTEX consortium includes experts from 17 European organizations and will work towards demonstrating these techniques using data from operating plants.
This three day course is intended for practicing systems engineers who want to learn how to apply model-driven systems Successful systems engineering requires a broad understanding of the important principles of modern spacecraft communications. This three-day course covers both theory and practice, with emphasis on the important system engineering principles, tradeoffs, and rules of thumb. The latest technologies are covered. <p>
Fundamentals of Passive and Active Sonar Technical Training Short Course SamplerJim Jenkins
This four-day course is designed for SONAR systems engineers, combat systems engineers, undersea warfare professionals, and managers who wish to enhance their understanding of passive and active SONAR or become familiar with the "big picture" if they work outside of either discipline. Each topic is presented by instructors with substantial experience at sea. Presentations are illustrated by worked numerical examples using simulated or experimental data describing actual undersea acoustic situations and geometries. Visualization of transmitted waveforms, target interactions, and detector responses is emphasized.
The document summarizes tests conducted on commercial video processors (CSPs) to evaluate their suitability for use in space applications. Preliminary tests on 5 CSP candidates from 2 manufacturers led to the selection of 1 part based on latchup sensitivity and electrical performance. Further lot evaluation tests included electrical characterization over temperature, dynamic life testing, and radiation tests for total ionizing dose and single event effects. The goal was to determine if the selected commercial CSP could be recommended for use in space payloads.
This document proposes using random pulse timing in synthetic aperture radar (SAR) imaging to achieve high azimuth resolution while maintaining full ground range coverage. It describes how compressive sensing allows for undersampling by mixing missing data through randomization. An iterative reconstruction algorithm is used to incorporate the sparsity prior and reconstruct high-resolution SAR images from randomly sampled radar echo data. Simulation results using synthetic data demonstrate the approach can produce images with improved azimuth resolution compared to uniform pulse timing schemes.
The document is a lecture on radar antennas and discusses various antenna scanning techniques. It begins with an overview of radar systems and the radar equation. It then covers antenna fundamentals and different types of mechanical, electronic and hybrid scanning antennas used in radar systems. The lecture outlines electronic scanning with phased arrays, including linear and planar array beamforming. It discusses controlling the array pattern through element excitation phases and amplitudes. Properties of linear arrays like beamwidth and sidelobes are also covered. The document provides examples of increasing array gain by adding more elements.
Open Annotation in the CHARMe Project for the I Annotate Conference Raquel Alegre
- The document discusses the CHARMe project, which uses open annotation to share knowledge about climate datasets and help users assess their fitness for purpose.
- Open annotation is a natural fit for CHARMe as it allows recording of motivations, tags, and multiple annotation targets.
- CHARMe will create connected repositories of commentary information stored as triples in "CHARMe nodes" that can be accessed through websites or services.
- Some advanced use cases for annotating climate data include discussing the timing of events, tracing plankton blooms, and identifying features in subsets of multidimensional climate datasets.
The document describes a proposed design for an underwater robot called Aquabot. It lists potential applications including collecting underwater samples, detecting gases, and monitoring wildlife. The design is adaptive, incorporating features from existing robots like hovering and detecting oil. Key features of Aquabot include a streamlined shape, fins for maneuvering, a camera for viewing up to 3 feet, and capacity for additional processing units. It will be remotely controlled via wireless technology and a joystick. The structure uses thrust from a pump for translation and directional fins for steering. The team estimates costs to be around $5,000 and provides a list of the main components.
1. O documento descreve o desenvolvimento de um peixe robô autônomo capaz de nadar e realizar tarefas aquáticas. É apresentada a estrutura mecânica e eletrônica do robô, bem como ensaios de propulsão, direção e controle de profundidade.
2. Inclui uma revisão bibliográfica sobre peixes robôs e suas aplicações, como exploração oceânica. Apresenta também a modelagem matemática e simulações realizadas.
3. Por fim, conclui com
The document discusses the Doppler effect, which is the change in frequency of a wave due to the movement of the source relative to the observer. It describes how the Doppler effect causes changes in the observed frequency of sound waves from an approaching or receding ambulance siren. It then gives the example of Doppler radar guns used by police to detect speeding vehicles by measuring changes in radar frequency caused by the Doppler effect. The formula provided calculates the perceived frequency based on the actual frequency, speed of sound, and speed of the observer/source.
O documento descreve o desenvolvimento de um peixe robô autônomo chamado Tucuazul com os objetivos de modelar seu comportamento, estudar a relação entre os parâmetros de movimento da cauda e a força de propulsão, e desenvolver sistemas eletrônicos e mecânicos para executar tarefas aquáticas. Desafios técnicos como comunicação, energia, eletrônica embarcada, mecânica e controle são abordados, assim como aplicações potenciais e revisão bibliográfica sobre a fisiologia de
Artigo Publicado no Congresso Brasileiro de Engenharia Mecânica de 2015 relativo ao estudo de um sistema de controle para direção e profundidade de um peixe-robô.
The document discusses the design of a robotic fish prototype. It covers the biomimetic inspiration of real fish motion, mathematical modeling including kinematics, dynamics, and degrees of freedom. Open and closed loop control strategies are examined through simulation. Potential applications of robotic fish include efficient ship propulsion and leading real fish to safety.
A six‐legged walking robot that is capable of basic mobility tasks such as walking forward, backward, rotating in place and raising or lowering the body height.The legs will be of a modular design and will have three degrees of freedom each.
The document outlines a capstone project using differentiated instruction to promote knowledge retention. Students will be grouped based on assessment needs and will work collaboratively to research topics, create lessons, and teach peers. The project incorporates 21st century skills, technology, authentic learning experiences, and assessments to guide instruction and evaluate increased understanding. Post-assessment scores showed most students improved in remedial topics after participating.
Interface stepper motor through Arduino using LABVIEW.Ankita Tiwari
The document describes an experiment to interface a stepper motor with Arduino using LabVIEW. It involves establishing a front panel and block diagram in LabVIEW to start communication with Arduino and send new control values or a stop signal. The Arduino code checks for new values from LabVIEW, uses the value as the delay interval between motor steps to control speed, and sends the calculated motor speed to another serial port to confirm it is working. The result is the stepper motor is successfully run by interfacing Arduino with LabVIEW.
A stepper motor converts electrical pulses into discrete mechanical movements of its shaft. The shaft rotates in discrete step increments that correspond directly to the sequence and frequency of input pulses. There are three main types of stepper motors: variable-reluctance, permanent magnet, and hybrid. Stepper motors provide controlled movement and are well-suited for applications that require control of rotation angle, speed, position, and synchronization. They have advantages like full torque at standstill and excellent response to starting, stopping, and reversing.
Faraday's Laws of Electromagnetic Induction are summarized as follows:
First, Michael Faraday discovered these laws through experiments in the 19th century. Second, Faraday's First Law states that an induced electromotive force (emf) is generated in a circuit whenever the magnetic flux through the circuit changes. Third, Faraday's Second Law specifies that the magnitude of the induced emf is equal to the rate of change of the magnetic flux through the circuit.
An autonomous underwater vehicle (AUV) is a robot which travels underwater without requiring input from an operator. AUVs constitute part of a larger group of undersea systems known as unmanned underwater vehicles, a classification that includes non-autonomous remotely operated underwater vehicles (ROVs) – controlled and powered from the surface by an operator/pilot via an umbilical or using remote control. In military applications AUVs are more often referred to simply as unmanned undersea vehicles (UUVs).
The document discusses interfacing a stepper motor with an 8051 microcontroller. A stepper motor can divide a full rotation into discrete steps through energizing coils in different sequences. The stepper motor can be interfaced with an 8051 using an L293D motor driver connected to ports P1.0, P1.2, P1.3, and P1.4 of the 8051. Both full-step and half-step sequences are described for energizing the coils to precisely control the motor's position without feedback. Assembly and C code examples are provided to demonstrate clockwise and counterclockwise rotation of the stepper motor connected to the 8051.
1. Michael Faraday discovered electromagnetic induction in 1831 through experiments showing that a changing magnetic field can induce an electric current in a nearby conductor.
2. Faraday's law of induction states that the induced electromotive force (emf) in a conductor is equal to the rate of change of magnetic flux through the conductor.
3. This discovery established the basis for technologies such as electric generators, transformers, electric motors, and inductors which are crucial components of modern electric power systems and electronics.
Roboticists develop robotic devices that can move autonomously and be programmed to behave in certain ways. Robots are considered intelligent if they can safely interact with unstructured environments while achieving specified tasks. The word robotics was first used in a 1942 Isaac Asimov short story and he explored ideas like robotherapists. Asimov also established three laws of robotics concerning not allowing or causing harm to humans. There are different types of robots including mobile, rolling, walking, stationary, autonomous, and remote-controlled robots that can have various purposes like exploration, manual labor, or controlled tasks.
Deep analysis of the 400Gb optical transceiver from a leading Chinese company.
More information: https://www.systemplus.fr/reverse-costing-reports/innolights-400g-qsfp-dd-optical-transceiver/
RapidAIR- a new urban dispersion modelling platform for air quality analysis ...Scott Hamilton
This document summarizes a presentation about RapidAIR, a new urban air quality dispersion modelling platform developed by Ricardo. RapidAIR uses an open-source python-based model that automates the workflow for modelling road traffic emissions. It can model emissions at a high resolution over large domains with computation times measured in seconds rather than hours. The model was evaluated against AERMOD and shown to produce highly similar results. Examples of RapidAIR applications to London and Beijing are presented to demonstrate its capabilities for policy analysis. Remote sensing data is also discussed and how it can be linked to dispersion models like RapidAIR.
Scalable NDT Instruments for the Inspection of Variable Geometry ComponentsOlympus IMS
For the past several years, the aviation industry has seen above normal growth due, in part, to lower oil prices, saving major aircraft operators millions of dollars. As a result of this outstanding growth, production rates for new airplanes have increased and new aircraft programs are being launched. Consequently, aviation component manufacturers are facing new challenges including a rise in production rates, a high probability of detection (POD) due to the critical nature of the parts being manufactured, lack of skilled operators, and parts with increasingly complex geometry.
Ultrasonic phased array (PA) instruments have evolved, enabling an increase in inspection speeds and the implementation of advanced acquisition strategies. The introduction of scalable instruments and advanced acquisition strategies helps manufacturers address the inspection challenges they are facing. Scalability can now be used for nondestructive testing (NDT), enabling system integrators and manufacturers to improve the performance of their solutions by using multiple instruments in parallel. The evolution of electronic components enables advanced acquisition strategies, such as adaptive ultrasound, to be implemented. Adaptive ultrasound simplifies the inspection of complex components and improves the POD by using innovative signal-processing algorithms.
This paper presents an overview of scalable NDT instruments with the goal of helping NDT integrators and manufacturers to address the challenges they are facing in terms of system performance, production output, and quality control.
The document describes a proposed design for an underwater robot called Aquabot. It lists potential applications including collecting underwater samples, detecting gases, and monitoring wildlife. The design is adaptive, incorporating features from existing robots like hovering and detecting oil. Key features of Aquabot include a streamlined shape, fins for maneuvering, a camera for viewing up to 3 feet, and capacity for additional processing units. It will be remotely controlled via wireless technology and a joystick. The structure uses thrust from a pump for translation and directional fins for steering. The team estimates costs to be around $5,000 and provides a list of the main components.
1. O documento descreve o desenvolvimento de um peixe robô autônomo capaz de nadar e realizar tarefas aquáticas. É apresentada a estrutura mecânica e eletrônica do robô, bem como ensaios de propulsão, direção e controle de profundidade.
2. Inclui uma revisão bibliográfica sobre peixes robôs e suas aplicações, como exploração oceânica. Apresenta também a modelagem matemática e simulações realizadas.
3. Por fim, conclui com
The document discusses the Doppler effect, which is the change in frequency of a wave due to the movement of the source relative to the observer. It describes how the Doppler effect causes changes in the observed frequency of sound waves from an approaching or receding ambulance siren. It then gives the example of Doppler radar guns used by police to detect speeding vehicles by measuring changes in radar frequency caused by the Doppler effect. The formula provided calculates the perceived frequency based on the actual frequency, speed of sound, and speed of the observer/source.
O documento descreve o desenvolvimento de um peixe robô autônomo chamado Tucuazul com os objetivos de modelar seu comportamento, estudar a relação entre os parâmetros de movimento da cauda e a força de propulsão, e desenvolver sistemas eletrônicos e mecânicos para executar tarefas aquáticas. Desafios técnicos como comunicação, energia, eletrônica embarcada, mecânica e controle são abordados, assim como aplicações potenciais e revisão bibliográfica sobre a fisiologia de
Artigo Publicado no Congresso Brasileiro de Engenharia Mecânica de 2015 relativo ao estudo de um sistema de controle para direção e profundidade de um peixe-robô.
The document discusses the design of a robotic fish prototype. It covers the biomimetic inspiration of real fish motion, mathematical modeling including kinematics, dynamics, and degrees of freedom. Open and closed loop control strategies are examined through simulation. Potential applications of robotic fish include efficient ship propulsion and leading real fish to safety.
A six‐legged walking robot that is capable of basic mobility tasks such as walking forward, backward, rotating in place and raising or lowering the body height.The legs will be of a modular design and will have three degrees of freedom each.
The document outlines a capstone project using differentiated instruction to promote knowledge retention. Students will be grouped based on assessment needs and will work collaboratively to research topics, create lessons, and teach peers. The project incorporates 21st century skills, technology, authentic learning experiences, and assessments to guide instruction and evaluate increased understanding. Post-assessment scores showed most students improved in remedial topics after participating.
Interface stepper motor through Arduino using LABVIEW.Ankita Tiwari
The document describes an experiment to interface a stepper motor with Arduino using LabVIEW. It involves establishing a front panel and block diagram in LabVIEW to start communication with Arduino and send new control values or a stop signal. The Arduino code checks for new values from LabVIEW, uses the value as the delay interval between motor steps to control speed, and sends the calculated motor speed to another serial port to confirm it is working. The result is the stepper motor is successfully run by interfacing Arduino with LabVIEW.
A stepper motor converts electrical pulses into discrete mechanical movements of its shaft. The shaft rotates in discrete step increments that correspond directly to the sequence and frequency of input pulses. There are three main types of stepper motors: variable-reluctance, permanent magnet, and hybrid. Stepper motors provide controlled movement and are well-suited for applications that require control of rotation angle, speed, position, and synchronization. They have advantages like full torque at standstill and excellent response to starting, stopping, and reversing.
Faraday's Laws of Electromagnetic Induction are summarized as follows:
First, Michael Faraday discovered these laws through experiments in the 19th century. Second, Faraday's First Law states that an induced electromotive force (emf) is generated in a circuit whenever the magnetic flux through the circuit changes. Third, Faraday's Second Law specifies that the magnitude of the induced emf is equal to the rate of change of the magnetic flux through the circuit.
An autonomous underwater vehicle (AUV) is a robot which travels underwater without requiring input from an operator. AUVs constitute part of a larger group of undersea systems known as unmanned underwater vehicles, a classification that includes non-autonomous remotely operated underwater vehicles (ROVs) – controlled and powered from the surface by an operator/pilot via an umbilical or using remote control. In military applications AUVs are more often referred to simply as unmanned undersea vehicles (UUVs).
The document discusses interfacing a stepper motor with an 8051 microcontroller. A stepper motor can divide a full rotation into discrete steps through energizing coils in different sequences. The stepper motor can be interfaced with an 8051 using an L293D motor driver connected to ports P1.0, P1.2, P1.3, and P1.4 of the 8051. Both full-step and half-step sequences are described for energizing the coils to precisely control the motor's position without feedback. Assembly and C code examples are provided to demonstrate clockwise and counterclockwise rotation of the stepper motor connected to the 8051.
1. Michael Faraday discovered electromagnetic induction in 1831 through experiments showing that a changing magnetic field can induce an electric current in a nearby conductor.
2. Faraday's law of induction states that the induced electromotive force (emf) in a conductor is equal to the rate of change of magnetic flux through the conductor.
3. This discovery established the basis for technologies such as electric generators, transformers, electric motors, and inductors which are crucial components of modern electric power systems and electronics.
Roboticists develop robotic devices that can move autonomously and be programmed to behave in certain ways. Robots are considered intelligent if they can safely interact with unstructured environments while achieving specified tasks. The word robotics was first used in a 1942 Isaac Asimov short story and he explored ideas like robotherapists. Asimov also established three laws of robotics concerning not allowing or causing harm to humans. There are different types of robots including mobile, rolling, walking, stationary, autonomous, and remote-controlled robots that can have various purposes like exploration, manual labor, or controlled tasks.
Deep analysis of the 400Gb optical transceiver from a leading Chinese company.
More information: https://www.systemplus.fr/reverse-costing-reports/innolights-400g-qsfp-dd-optical-transceiver/
RapidAIR- a new urban dispersion modelling platform for air quality analysis ...Scott Hamilton
This document summarizes a presentation about RapidAIR, a new urban air quality dispersion modelling platform developed by Ricardo. RapidAIR uses an open-source python-based model that automates the workflow for modelling road traffic emissions. It can model emissions at a high resolution over large domains with computation times measured in seconds rather than hours. The model was evaluated against AERMOD and shown to produce highly similar results. Examples of RapidAIR applications to London and Beijing are presented to demonstrate its capabilities for policy analysis. Remote sensing data is also discussed and how it can be linked to dispersion models like RapidAIR.
Scalable NDT Instruments for the Inspection of Variable Geometry ComponentsOlympus IMS
For the past several years, the aviation industry has seen above normal growth due, in part, to lower oil prices, saving major aircraft operators millions of dollars. As a result of this outstanding growth, production rates for new airplanes have increased and new aircraft programs are being launched. Consequently, aviation component manufacturers are facing new challenges including a rise in production rates, a high probability of detection (POD) due to the critical nature of the parts being manufactured, lack of skilled operators, and parts with increasingly complex geometry.
Ultrasonic phased array (PA) instruments have evolved, enabling an increase in inspection speeds and the implementation of advanced acquisition strategies. The introduction of scalable instruments and advanced acquisition strategies helps manufacturers address the inspection challenges they are facing. Scalability can now be used for nondestructive testing (NDT), enabling system integrators and manufacturers to improve the performance of their solutions by using multiple instruments in parallel. The evolution of electronic components enables advanced acquisition strategies, such as adaptive ultrasound, to be implemented. Adaptive ultrasound simplifies the inspection of complex components and improves the POD by using innovative signal-processing algorithms.
This paper presents an overview of scalable NDT instruments with the goal of helping NDT integrators and manufacturers to address the challenges they are facing in terms of system performance, production output, and quality control.
1) The document summarizes efforts to quantify urban greenhouse gas (GHG) emissions, specifically carbon dioxide (CO2), through both top-down atmospheric measurements and bottom-up inventory methods.
2) A key goal is to reconcile differences between top-down and bottom-up estimates of whole-city CO2 emissions in Indianapolis, finding final agreement within 7% once various factors are accounted for.
3) A new project called ACE (Auckland's Carbon Emissions) aims to quantify both fossil fuel and biogenic CO2 fluxes in Auckland to meet policy needs, given most current estimates exclude urban land carbon.
The document describes two LC oscillator designs for laser detection and ranging (LADAR) applications: a fixed frequency oscillator bank (FFOB) and a voltage controlled oscillator bank (VCOB). The FFOB generates 16 discrete frequencies from 600 MHz to 2.1 GHz using separate fixed LC oscillators but only functioned reliably in the upper frequency range. The VCOB was designed to improve on the FFOB by allowing frequency control with voltage. Both designs were simulated and layout was completed for the FFOB, while the VCOB is still in the design and simulation phase.
A 13b SAR ADC with Eye-opening VCO Based ComparatorKentaro Yoshioka
This document presents a low power technique for high resolution SAR ADCs using a VCO comparator with an eye-opening operation. It motivates the need for low power, high resolution ADCs for applications like IoT devices. It then discusses challenges for the main SAR ADC building blocks, particularly the C-DAC and comparators. The proposed technique uses a VCO comparator that automatically scales its noise and power based on the input difference signal, reducing noise when the difference is small through an eye-opening oscillation operation. Measurement results show the implemented 13b SAR ADC achieves 66.4dB SNDR at 45uW power, demonstrating competitive performance compared to prior works.
A Technique for Dynamic Range Improvement of Intermodulation Distortion Produ...Pete Sarson, PH.D
This paper describes a phase switching algorithm for Interpolating Digital-to-Analog Converter (DAC) based Arbitrary Waveform Generators (AWG). This was possible by using the standard phase switching algorithm with the addition of simple phase offset and systematic phase difference adjustment; this was discovered by experimenting with suppression of the intermodulation distortion (IMD) components of a two-tone signal. In this case, we examine the 3rd, 5th and 7th order IMD tones and the effect of the phase switching algorithm and phase shift has on the AWG by measurement with a digitizer. Then we show what the effect of the developed two-tone phase switching technique has upon the performance measurement of a 16-bit Analog-to-Digital Converter (ADC). It is shown that using the original algorithm, no improvement could be achieved for the odd order IMD products. However, by using an even order suppression technique (another phase difference) with a phase shift, a suppression was achieved compared to the standard two-tone signal generation (without phase switching). We show how this technique allows the use of a low-cost tester resource to test IMD products with a higher dynamic range than was previously possible.
This document summarizes a presentation on land surface albedo and downwelling shortwave radiation retrieval from geostationary satellites. It describes products from the Land Surface Analysis Satellite Application Facility including surface albedo, downwelling shortwave and longwave fluxes, snow cover, and other variables. Methods for albedo retrieval and evaluation showing good accuracy are presented, as are applications for weather forecasting where the data improve model performance. Open issues and plans for future improvements are discussed.
This document discusses advances in laser spectroscopy technology called OA-ICOS and its applications. OA-ICOS combines high resolution spectroscopy with long optical path lengths using an optical cavity. This provides sensitivity down to parts-per-billion levels for multi-gas analysis. The document outlines OA-ICOS technology, its implementation in analyzers by ABB-LGR, and applications in industrial process control, environmental monitoring, and semiconductor manufacturing. Case studies show its use for trace gas analysis, leak detection, and quality control in industries including chemicals and petrochemicals.
The document discusses inertial navigation systems (INS) and their use in dynamic positioning (DP) applications. An INS uses gyroscopes and accelerometers to continuously calculate position without external references. While INS drift over time, integrating additional sensors like acoustic positioning, Doppler velocity logs, and GPS can significantly improve accuracy through data fusion. The document examines how pairing an INS with acoustic positioning systems can provide reliable, high-accuracy positioning even if individual sensors fail or are unavailable. It suggests INS combined with acoustic loggers is sufficient redundancy and accuracy for many DP applications.
This document discusses algorithms and processing methods used by AERONET to calibrate direct sun and diffuse sky radiance measurements from its global network of sun photometers and derive aerosol optical depth, precipitable water, and other aerosol properties. It describes current algorithms and plans for refinements, including updating extraterrestrial solar flux calculations, Rayleigh scattering calculations, ozone and water vapor modeling, and implementing corrections for water vapor and gases in retrieving aerosol optical depth at 1020nm and 1640nm. It also discusses recalibrating the water vapor channel of AERONET instruments and quality assuring the updated precipitable water database through comparisons with GPS and microwave radiometer measurements.
The document summarizes the MiniCLEAN experiment, which aims to test a liquid argon detector design for dark matter searches. MiniCLEAN has completed construction and is undergoing commissioning. Key points include:
- MiniCLEAN will study light yield, position reconstruction, and background rejection techniques in liquid argon using a 500 kg detector.
- Construction is complete and cooling of the detector is underway. Analyses of LED calibration data and cryopit vacuum data are ongoing.
- Expected performance is a light yield of 6 photons/keV and background rate below 1 event/year in the fiducial volume. This would allow a WIMP sensitivity down to a cross-section of ~10^-10 pb.
Teledyne RESON presented new product developments at the Hydrographic Society, including the XRANGE and Full Rate Dual Head systems introduced in 2012. In 2013, RESON introduced new multibeam systems, software features, and pipe tracking capabilities. The presentation discussed the T20 portable sonar processor and detailed new operating modes, water column visualization, automated tracking, multi-detect features, and pipe detection and tracking modules. RESON also demonstrated forward-looking systems and their basking shark research using the SeaBat 7128 system.
Routes to Clean Air 2016 - Dr Kevin Turpin, TRLIES / IAQM
Talk title - Development of remote sensors for vehicle emissions detection
Routes to Clean Air is a two-day conference from the IAQM where academics, professionals and policy makers share their experiences of improving traffic emissions.
This event highlights the importance of public communication and behavioural change surrounding road transport and air quality issues.
The Collaborative Sensor Rotation Programme aims to collaboratively increase air quality monitoring coverage and reduce costs. Initial field trials of low-cost sensors show potential but also limitations. Data from a monitoring site in Glasgow showed low-cost sensors can accurately measure NO and PM2.5, but NO2 measurements require accounting for ozone interference. Future work includes further sensor testing, developing an environmental incident management system, and expanding partnerships.
This document describes research on modeling and simulating the sound generated by airflow around a circular cylinder. It begins with the inspiration from an IYPT problem and reviews relevant literature. Background theory is provided on computational aeroacoustics methods like Lighthill's acoustic analogy. The project approach uses 2D and 3D large eddy simulation CFD to model the unsteady flow field, then applies the Ffowcs Williams-Hawkins equation to propagate sound from the source to receivers. Results show good agreement with experiments in drag coefficient, lift coefficient, Strouhal number, and acoustic spectra. Future work is proposed on flexible bodies, rotating cylinders, and propulsion.
This document summarizes research on assimilating synthetic aperture radar (SAR) data into sea ice analysis models. It presents a 0D-var data assimilation approach using RADARSAT-2 SAR texture features as observations. Key SAR features for discriminating sea ice and open water are identified. The forward operator predicts features from ice concentration. Assimilation improves analysis over background-only forecasts, updating ice concentration estimates. Optimal feature selection considers statistical independence, model generalization, and analysis bias.
Open Annoration in the CHARMe Project for the W3C workshop on OA (San Francis...Raquel Alegre
The CHARMe project (http://charme.org.uk/) uses W3C Open Annotation (http://www.openannotation.org/spec/core/) to provide linkage between Climate Datasets and metadata discovered or generated by users.
The document discusses micro Doppler estimation and how it can be used to identify pedestrians in an automotive radar system. Micro Doppler effects produce additional Doppler shifts from vibrations and rotations of target parts like helicopter blades or human arm swings. To identify a pedestrian walking behind a parked car, singular value decomposition is used to filter the strong return from the parked car, revealing the weaker micro-Doppler signature of the pedestrian's moving limbs in the remaining signal. This confirms a pedestrian is present and can help the ego vehicle detect and avoid potential accidents.
1. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Doppler effect
GROSJEAN Ludovic
http://www.univ-tln.fr/
July 16, 2013
GROSJEAN Ludovic Doppler effect 1 / 19
2. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
1 Introduction to the Doppler effect
2 ADCP
Operating principle
Bottom-tracking versus Upward-looking ADCP
Acquired data and profiling examples
3 ADV
Operating principle
Acquired data and profiling examples
4 DVL
Operating principle
Data processing
5 Conclusion
GROSJEAN Ludovic Doppler effect 2 / 19
3. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Principle
It is the change in frequency of a periodic event (wave) for an
observer moving relative to its source
GROSJEAN Ludovic Doppler effect 3 / 19
4. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Operating principle
Bottom-tracking versus Upward-looking ADCP
Acquired data and profiling examples
Definition
Acoustic: Sound waves are scattered back from particles
GROSJEAN Ludovic Doppler effect 4 / 19
5. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Operating principle
Bottom-tracking versus Upward-looking ADCP
Acquired data and profiling examples
Definition
Acoustic: Sound waves are scattered back from particles
Doppler: Using the Doppler effect
GROSJEAN Ludovic Doppler effect 4 / 19
6. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Operating principle
Bottom-tracking versus Upward-looking ADCP
Acquired data and profiling examples
Definition
Acoustic: Sound waves are scattered back from particles
Doppler: Using the Doppler effect
Current: Measure water current velocities
GROSJEAN Ludovic Doppler effect 4 / 19
7. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Operating principle
Bottom-tracking versus Upward-looking ADCP
Acquired data and profiling examples
Definition
Acoustic: Sound waves are scattered back from particles
Doppler: Using the Doppler effect
Current: Measure water current velocities
Profiler: For current profiling in the water column
GROSJEAN Ludovic Doppler effect 4 / 19
8. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Operating principle
Bottom-tracking versus Upward-looking ADCP
Acquired data and profiling examples
Cell cutting
Determine the depth of
the particle d
d = v ∗ t measuring t
v = F ∗ λ
Cut the water column in
cell size
Provides a velocity profile
for each cell
GROSJEAN Ludovic Doppler effect 5 / 19
9. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Operating principle
Bottom-tracking versus Upward-looking ADCP
Acquired data and profiling examples
Cell cutting
Determine the depth of
the particle d
d = v ∗ t measuring t
v = F ∗ λ
Cut the water column in
cell size
Provides a velocity profile
for each cell
GROSJEAN Ludovic Doppler effect 5 / 19
10. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Operating principle
Bottom-tracking versus Upward-looking ADCP
Acquired data and profiling examples
Data comparison
4 acoustic transducers
Emit and receive
acoustical pulses from 4
directions
2 opposed beams collect
velocity components (u,v
for each w)
Comparison: Error
velocity
Software suites convert
data
GROSJEAN Ludovic Doppler effect 5 / 19
11. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Operating principle
Bottom-tracking versus Upward-looking ADCP
Acquired data and profiling examples
Data comparison
4 acoustic transducers
Emit and receive
acoustical pulses from 4
directions
2 opposed beams collect
velocity components (u,v
for each w)
Comparison: Error
velocity
Software suites convert
data
GROSJEAN Ludovic Doppler effect 5 / 19
12. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Operating principle
Bottom-tracking versus Upward-looking ADCP
Acquired data and profiling examples
Recording areas
“Blank” zone:
Bottom
Surface area
Height measurement
Echoes and reflections
GROSJEAN Ludovic Doppler effect 5 / 19
13. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Operating principle
Bottom-tracking versus Upward-looking ADCP
Acquired data and profiling examples
Recording areas
“Blank” zone:
Bottom
Surface area
Height measurement
Echoes and reflections
GROSJEAN Ludovic Doppler effect 5 / 19
14. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Operating principle
Bottom-tracking versus Upward-looking ADCP
Acquired data and profiling examples
Bottom-tracking versus Upward-looking ADCP
GROSJEAN Ludovic Doppler effect 6 / 19
15. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Operating principle
Bottom-tracking versus Upward-looking ADCP
Acquired data and profiling examples
Bottom-tracking versus Upward-looking ADCP
Upward-looking ADCP
Fixed to a mooring or a
marine structure
Current profile time series
Wave directional
spectrum
GROSJEAN Ludovic Doppler effect 6 / 19
16. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Operating principle
Bottom-tracking versus Upward-looking ADCP
Acquired data and profiling examples
Bottom-tracking versus Upward-looking ADCP
GROSJEAN Ludovic Doppler effect 6 / 19
17. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Operating principle
Bottom-tracking versus Upward-looking ADCP
Acquired data and profiling examples
Bottom-tracking versus Upward-looking ADCP
Bottom-tracking ADCP
Mounted on a mobile
vehicle
Track the bottom vehicle
velocity
Current profile spatial
cross section
GROSJEAN Ludovic Doppler effect 6 / 19
18. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Operating principle
Bottom-tracking versus Upward-looking ADCP
Acquired data and profiling examples
GROSJEAN Ludovic Doppler effect 7 / 19
19. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Operating principle
Acquired data and profiling examples
Definition
Acoustic: Sound waves are scattered back from particles
GROSJEAN Ludovic Doppler effect 8 / 19
20. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Operating principle
Acquired data and profiling examples
Definition
Acoustic: Sound waves are scattered back from particles
Doppler: Using the Doppler effect
GROSJEAN Ludovic Doppler effect 8 / 19
21. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Operating principle
Acquired data and profiling examples
Definition
Acoustic: Sound waves are scattered back from particles
Doppler: Using the Doppler effect
Velocimeter: Record instantaneous velocity components at a
single-point with a relatively high frequency
GROSJEAN Ludovic Doppler effect 8 / 19
22. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Operating principle
Acquired data and profiling examples
Caracteristics
Bistatic acoustic Doppler
system
Probe head consists of a
transmitter
Two to four receivers
GROSJEAN Ludovic Doppler effect 9 / 19
23. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Operating principle
Acquired data and profiling examples
Capabilities
High-precision instrument
Measure 3D water
velocity
Sensor mounted on stem
The probe is submerged
in the flow
GROSJEAN Ludovic Doppler effect 9 / 19
24. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Operating principle
Acquired data and profiling examples
Specifications
Record instantaneous
velocity components
Single-point
High frequency
Perform to measure the
particle velocity in a
remote sampling volume
GROSJEAN Ludovic Doppler effect 9 / 19
25. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Operating principle
Acquired data and profiling examples
GROSJEAN Ludovic Doppler effect 10 / 19
26. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Operating principle
Data processing
Definition
Doppler: Using the Doppler effect
GROSJEAN Ludovic Doppler effect 11 / 19
27. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Operating principle
Data processing
Definition
Doppler: Using the Doppler effect
Velocity: Used to determine the velocity vector of the device
GROSJEAN Ludovic Doppler effect 11 / 19
28. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Operating principle
Data processing
Definition
Doppler: Using the Doppler effect
Velocity: Used to determine the velocity vector of the device
Log: Used for navigation submarines systems
GROSJEAN Ludovic Doppler effect 11 / 19
29. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Operating principle
Data processing
Moving vessel navigation
AUV
ROV
Surface vessels
Divers
GROSJEAN Ludovic Doppler effect 12 / 19
30. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Operating principle
Data processing
Moving vessel navigation
AUV
ROV
Surface vessels
Divers
GROSJEAN Ludovic Doppler effect 12 / 19
31. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Operating principle
Data processing
Position estimation
Beam coordinates
+ Transducer orientation
+ Ship coordinates: GPS
(heading)
+ Earth coordinates
GROSJEAN Ludovic Doppler effect 12 / 19
32. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Operating principle
Data processing
Position estimation
Beam coordinates
+ Transducer orientation
+ Ship coordinates: GPS
(heading)
+ Earth coordinates
GROSJEAN Ludovic Doppler effect 12 / 19
33. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Operating principle
Data processing
Navigation replacement for
Separate current meters
Temperature sensors
Altimeters
Navigation equipment
GROSJEAN Ludovic Doppler effect 12 / 19
34. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Operating principle
Data processing
GROSJEAN Ludovic Doppler effect 13 / 19
35. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Operating value examples
ADCP1 ADCP ADV2 ADV DVL3 DVL
Frequency
(kHz)
1200
to 300
75 16000 5000 1200 300
Operational
depth rating
(m)
200 to
6000
1500
to
3000
60 250 to
2000
3000
to
6000
3000
to
6000
Measurement
range (m)
0.6 to
150
20 to
700
0.03
to 2.5
0.05
to 5
0.5 to
30
1 to
200
Profile reso-
lution (m)
2 16 0.01 0.01 0.25
to 18
1 to
110
1
RDI
2
SonTek
3
RDI
GROSJEAN Ludovic Doppler effect 14 / 19
36. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Accuracy and limitation
ADCP ADV DVL
Aim current measure-
ment within the
water column
Single-point
instan-
taneous
velocity
components
Accurate
navigation
systems
Frequency Low High Medium
Accuracy Low High Medium
Advantages High range High resolu-
tion
Navigation
tool
Disadvantages Limited resolution Low range Need bat-
tery
Limitations “Blank” zone Max depth Lifetime
GROSJEAN Ludovic Doppler effect 15 / 19
37. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
References
Palmer, 2002, ADV: Principles of Operation, http://web.mit.edu/
Hubert Chanson, Mark Trevethan and Shin-Ichi Aoki, 2005,
Acoustic Doppler Velocimetry (ADV) in a small estuarine system.
field experience and ”despiking”, http://espace.library.uq.edu.au/
Y. Ourmi`eres, B. Zakardjian, K. Branger, C. Langlais, 2011,
Assessment of a NEMO-based downscaling experiment for the
North-Western Mediterranean region: Impacts on the Northern
Current and comparison with ADCP data and altimetry products,
http://www.sciencedirect.com/
GROSJEAN Ludovic Doppler effect 16 / 19
38. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
References
SonTek, SonTek ADV, http://www.sontek.com/
G. Voulgaris and J. H. Trowbrige, 1997, Evaluation of the Acoustic
Doppler Velocimeter (ADV) for Turbulence Measurements
Rowe Technologies,ADCP/DVL applications guide,
http://www.rowetechinc.com/
Calculating Ocean velocity from ADCP data
Are Willumsen, Robert Sorhagen, Bjorn Jalving, Kenneth Gade,
Kristian Svartveit, 2004, DVL Velocity Aiding in the HUGIN 1000
Integrated Inertial Navigation System
Teledyne RD Instruments, 2007, The Teledyne RD Instruments
family of current profiling products
GROSJEAN Ludovic Doppler effect 17 / 19
39. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
References
Are Willumsen, Robert Sorhagen, Bjorn Jalving, Kenneth Gade,
Kristian Svartveit, 2004, DVL Velocity Aiding in the HUGIN 1000
Integrated Inertial Navigation System
Eugene A. Terray, Blair H. Brumley and Brandon Strong, Measuring
Waves and Currents with an Upward-Looking ADCP
IRD, Module de formation en Dbitmtrie Projets Niger-HYCOS et
Volta-HYCOS
Vincent Deroubaix, 2000,Implantation d’un GPS d’attitude sur la
centrale d’acquisition ADCP du projet SAVED, Woods Hole
Oceanographic Institution
Lakshmi H. Kantha, Carol Anne Clayson, Numerical Models of
Oceans and Oceanic Processes, Volume 66 (International
Geophysics)
GROSJEAN Ludovic Doppler effect 18 / 19
40. Introduction to the Doppler effect
ADCP
ADV
DVL
Conclusion
Thank you for listening
Do you have any
questions ?
GROSJEAN Ludovic Doppler effect 19 / 19