Laser And Fiber Optic Gas Absorption Spectroscopy
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Laser And Fiber Optic Gas Absorption Spectroscopy
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Author : George Stewart
language : en
Publisher: Cambridge University Press
Release Date : 2021-04-08
Laser And Fiber Optic Gas Absorption Spectroscopy written by George Stewart and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-04-08 with Science categories.
A rigorous account of the physics and engineering of diode and fibre laser gas sensor design, with key applications.
Measurement Of Temperature Distribution Based On Optical Fiber Sensing Technology And Tunable Diode Laser Absorption Spectroscopy
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Author : Peng-Shuai Sun
language : en
Publisher:
Release Date : 2018
Measurement Of Temperature Distribution Based On Optical Fiber Sensing Technology And Tunable Diode Laser Absorption Spectroscopy written by Peng-Shuai Sun and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with Technology categories.
Temperature is an important physical quantity in most industrial processes. Distributed temperature sensor (DTS), fiber Bragg grating (FBG), and tunable diode laser absorption spectroscopy (TDLAS) are three primary techniques for temperature measurement using fiber optic sensing and spectrum technology. The DTS system can monitor space temperature field along the fiber in real time. In addition, it also can locate a fire source using two sections of optical fibers which are placed orthogonally to each other. The FBG temperature sensor is used to measure the point temperature. The temperature sensitivity of the bare FBG is 10.68 pm/°C and the linearity is 0.99954 in the range of 30-100°C. Based on tunable diode laser absorption spectroscopy (TDLAS), two-dimensional (2D) distribution reconstructions of gas temperature are realized using an algebraic reconstruction technique (ART). The results are in agreement with the simulation results, and the time resolution is less than 1 s.
Green Electronics
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Author : Cristian Ravariu
language : en
Publisher: BoD – Books on Demand
Release Date : 2018-06-20
Green Electronics written by Cristian Ravariu and has been published by BoD – Books on Demand this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-06-20 with Technology & Engineering categories.
The Green Electronics book is intended to stimulate people's thinking toward the new concepts of an environment-friendly electronics - the main challenge in the future. The book offers multiple solutions to push the classical electronic industry toward green concepts, aided by nanotechnologies, with revolutionary features that provide low power consumption in electronics, use biomaterials for integrated structures, and include environmental monitoring tools. Based on organic semiconductors/insulators without toxic precursors, green electronic technologies launched promising devices like OLED, OTFT, or nano-core-shell transistors. The Green Electronics book successfully presents the recent directions collected worldwide and leaves free space for continuing year by year with new subtopics.
Optical Generation And Detection Of Acoustic Pulse Profiles In Gases For Novel Ultrasonic Absorption Spectroscopy
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Author : A. C. Tam
language : en
Publisher:
Release Date : 1984
Optical Generation And Detection Of Acoustic Pulse Profiles In Gases For Novel Ultrasonic Absorption Spectroscopy written by A. C. Tam and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with categories.
We demonstrate a new all-optical, frequency-multiplexed and fast technique for gas-phase ultrasonic absorption spectroscopy. A pulsed laser produces a short-duration acoustic pulse in the gas sample, and the acoustic pulse profiles at two distances are monitored by focused continuous probe beams. Fourier decompositions of these probe deflection signals provide the absorption spectrum, and examples for CO2 + H2O mixture are given Ultrasonic propagation speeds in the MHz regime are also obtained for several gases.
Laser Induced Breakdown Spectroscopy
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Author : Andrzej W. Miziolek
language : en
Publisher: Cambridge University Press
Release Date : 2006-09-07
Laser Induced Breakdown Spectroscopy written by Andrzej W. Miziolek and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006-09-07 with Technology & Engineering categories.
This is a comprehensive reference explaining the fundamentals of the LIBS phenomenon, its history and its fascinating applications across eighteen chapters written by recognized leaders in the field. This book will be of significant interest to researchers in chemical and materials analysis within academia and industry.
Multiplexed Gas Spectroscopy Using Tunable Vcsels
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Author :
language : en
Publisher:
Release Date : 2012
Multiplexed Gas Spectroscopy Using Tunable Vcsels written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Detection and identification of gas species using tunable laser diode laser absorption spectroscopy has been performed using vertical cavity surface emitting lasers (VCSEL). Two detection methods are compared: direct absorbance and wavelength modulation spectroscopy (WMS). In the first, the output of a DC-based laser is directly monitored to detect for any quench at the targeted specie wavelength. In the latter, the emission wavelength of the laser is modulated by applying a sinusoidal component on the drive current of frequency?, and measuring the harmonics component (2?) of the photo-detected current. This method shows a better sensitivity measured as signal to noise ratio, and is less susceptible to interference effects such as scattering or fouling. Gas detection was initially performed at room temperature and atmospheric conditions using VCSELs of emission wavelength 763 nm for oxygen and 1392 nm for water, scanning over a range of approximately 10 nm, sufficient to cover 5-10 gas specific absorption lines that enable identification and quantization of gas composition. The amplitude and frequency modulation parameters were optimized for each detected gas species, by performing two dimensional sweeps for both tuning current and either amplitude or frequency, respectively. We found that the highest detected signal is observed for a wavelength modulation amplitude equal to the width of the gas absorbance lines, in good agreement with theoretical calculations, and for modulation frequencies below the time response of the lasers (
Ultrasensitive Laser Spectroscopy
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Author : David S. Kliger
language : en
Publisher:
Release Date : 1983
Ultrasensitive Laser Spectroscopy written by David S. Kliger and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with Science categories.
Ultrasensitive Laser Spectroscopy covers the experimental methods involved in various sensitive techniques to which lasers have been applied for the study of weak transitions. This book is organized into seven chapters. Each chapter discusses the theories, experiments, and application of the specific technique. A discussion on the advantages, disadvantages, and modifications made in each technique is also provided. Ultrasensitive techniques considered in this text include photoacoustic, one- and two-photon excitation, absorption, mass, and laser ionization spectroscopies. Other chapters exami ...
Laser Focus With Fiberoptic Technology
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Author :
language : en
Publisher:
Release Date : 1982
Laser Focus With Fiberoptic Technology written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Fiber optics categories.
Laser Induced Breakdown Spectrometry
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Author : Yong-Ill Lee
language : en
Publisher: Nova Publishers
Release Date : 2000
Laser Induced Breakdown Spectrometry written by Yong-Ill Lee and has been published by Nova Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Science categories.
When the output from a pulsed laser is forced onto a small spot of a sample, optically induced plasma, called laser-induced plasma (LIP) is formed at the surface. The plasma is formed when the laser power density exceeds the breakdown threshold value of the surface. The plasma can be used in sampling but is proposed as a source for atomic emission spectrometry (AES). In this case the technique is referred to as laser induced breakdown (emission) spectrometry (LIBS). The spectrally and temporally resolved detection and subsequent determination of the specific atomic emission reveals analytical information about the elemental composition of the sample, including solids, liquids and gases. This book is devoted to the analytical technique of laser-induced breakdown spectrometry. An introduction covering some basic principles of atomic emission spectrometry, analytical performance characteristics, and a comparison to more conventional techniques provides background information for the reader. The book is then conveniently divided into three parts: the first part described the instrumentation required and options available, the second part on fundamental studies of the laser plasma, and the third part on applications. Finally the future development of LIBS is presented.
Fiber Optic Laser Raman Spectroscopy Sensor
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Author :
language : en
Publisher:
Release Date : 2003
Fiber Optic Laser Raman Spectroscopy Sensor written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.
The Defense Programs Plant Directed Research and Development Program sponsored the optimization and interface of a fiber-optic Raman sensor as a complementary technique to mass spectrometry currently used in the Tritium Facility for measuring hydrogen isotopes. This sensor will provide real-time feedback while reducing the sample load for off-line gas analysis by the Tritium mass spectrometers. The compact Raman system incorporates a 488 nanometer laser system, spectrometer and detector along with a 20-foot fiber-optic probe. The analysis of gas mixtures of protium and deuterium at various compositions and total pressures ranging form 11 to 5000 torr showed good signal to noise ratios using very short integration times (15 seconds). The detection limits for protium and deuterium ranged from 0.5 percent to 0.8 percent. This probe will be demonstrated in-line in the new HT TCAP (hydrogen-tritium thermal cycling absorption process) cold runs.