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Author : Susan Hilary Law
Publisher :
ISBN 13 :
Total Pages : 470 pages
Book Rating : 4.:/5 (22 download)
Download or read book The Application of Laser Induced Fluorescence as a Plasma Diagnostic Technique written by Susan Hilary Law and published by . This book was released on 1986 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : A. Tserepi
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (113 download)
Download or read book Nonequilibrium Plasmas written by A. Tserepi and published by . This book was released on 1996 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The two-photon laser induced fluorescence (TALIF) diagnostic has been developed and/or applied to plasma processing systems involving H, 0, and N atoms. Based upon TALIF data, models have been developed for the spatial and temporal variation of the absolute atomic concentrations in H2, 02, and N2 plasmas. The portability of the TALIF diagnostic has been demonstrated. Limitations of the technique due to stimulated emission and fluorescence quenching have been investigated and procedures developed to minimize their effects.
Author :
Publisher :
ISBN 13 :
Total Pages : 258 pages
Book Rating : 4.3/5 (91 download)
Download or read book Laser Induced Plasma Spectroscopy and Applications written by and published by . This book was released on 2002 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Orlando Auciello
Publisher : Academic Press
ISBN 13 : 1483216241
Total Pages : 470 pages
Book Rating : 4.4/5 (832 download)
Download or read book Plasma Diagnostics written by Orlando Auciello and published by Academic Press. This book was released on 2013-10-22 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plasma Diagnostics, Volume 1: Discharge Parameters and Chemistry covers seven chapters on the important diagnostic techniques for plasmas and details their use in particular applications. The book discusses optical diagnostic techniques for low pressure plasmas and plasma processing; plasma diagnostics for electrical discharge light sources; as well as Langmuir probes. The text also describes the mass spectroscopy of plasmas, microwave diagnostics, paramagnetic resonance diagnostics, and diagnostics in thermal plasma processing. Electrical engineers, nuclear engineers, microwave engineers, chemists, and technical personnel in universities, industry, and national laboratories will find the book invaluable.
Author : S. J. Davis
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book Applications of Laser-induced Fluorescence to Medical Diagnostic Problems written by S. J. Davis and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : A. Tserepi
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (858 download)
Download or read book Nonequilibrium Plasmas written by A. Tserepi and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The two-photon laser induced fluorescence (TALIF) diagnostic has been developed and/or applied to plasma processing systems involving H, 0, and N atoms. Based upon TALIF data, models have been developed for the spatial and temporal variation of the absolute atomic concentrations in H2, 02, and N2 plasmas. The portability of the TALIF diagnostic has been demonstrated. Limitations of the technique due to stimulated emission and fluorescence quenching have been investigated and procedures developed to minimize their effects.
Author : Stefan Andersson-Engels
Publisher :
ISBN 13 :
Total Pages : 324 pages
Book Rating : 4.3/5 (91 download)
Download or read book Laser-induced Fluorescence for Medical Diagnostics written by Stefan Andersson-Engels and published by . This book was released on 1989 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Warren Wright
Publisher :
ISBN 13 :
Total Pages : 584 pages
Book Rating : 4.:/5 (22 download)
Download or read book The Development and Application of Laser-induced Fluorescence for the Study of Magnetically Confined Plasmas written by Warren Wright and published by . This book was released on 1989 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Brian Ho-yin Cheung
Publisher : Stanford University
ISBN 13 :
Total Pages : 197 pages
Book Rating : 4.F/5 ( download)
Download or read book Tracer-based Planar Laser-induced Fluorescence Diagnostics written by Brian Ho-yin Cheung and published by Stanford University. This book was released on 2011 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two advances to tracer-based planar laser-induced fluorescence (PLIF) diagnostics are presented in this work. The first improvement is the development of a 3-pentanone fluorescence quantum yield (FQY) database and model for a wide range of conditions in support of quantitative PLIF diagnostics. In addition, this work presents a sensitive, time-resolved tracer-based PLIF diagnostic, accomplished by using a continuous-wave (CW) laser with the high-FQY tracer toluene. Because of its ease of use and desirable photophysical properties, PLIF diagnostics using 3-pentanone as a tracer are common, particularly for internal combustion engine (ICE) diagnostics. Thus, there is a need for 3-pentanone FQY measurements and modeling over a wide range of temperatures, pressures, and excitation wavelengths. For insight into the collisionless process in the FQY model, measurements were made in 3-pentanone vapor at low-pressures across a range of temperatures using a flowing cell. Laser excitation with 248, 266, 277, 308 nm wavelengths were utilized, and Rayleigh scattering of the laser beam was used to calibrate the optical efficiency of the collection optics and detector. This low-pressure data allows calculation of the 3-pentanone fluorescence rate and non-radiative de-excitation rate in the fluorescence model. The vibrational relaxation cascade parameter for 3-pentanone collisions was also determined. Measurements of 3-pentanone FQY were also made over a range of temperatures and pressures relevant to diagnostic applications, and, in particular, combined high-temperature and high-pressure conditions applicable to internal combustion engines (ICE). These data were collected in a custom-built optical cell capable of simultaneous high-pressure and high-temperature conditions. The behavior of the FQY in nitrogen for temperatures up to 745 K and in air up to 570 K was examined for pressures from 1 to 25 bar. These data were used to further optimize the parameters in the FQY model representing collisional processes. The large quantity of data with 308 nm excitation allowed optimization of the nitrogen quenching rate, and data in air were used to optimize the oxygen quenching rate. These data were also used to optimize the vibrational relaxation parameters for nitrogen and oxygen. The model with the updated parameters is consistent with the data collected in the current work, as well as with fluorescence measurements made in optical ICEs up to 1100 K and 28 bar. Another area of tracer-based PLIF diagnostics development is time-resolved imaging. Because PLIF diagnostics are often performed using pulsed lasers, the time resolution of measurements is limited to the pulse rate of laser. Use of a high-powered visible laser with an off-the-shelf cavity frequency doubler is shown to produce a moderate-power CW beam in the ultraviolet wavelength regime. Application of this CW source to excite toluene, a high-FQY tracer, yields a sensitive, time-resolved tracer-based PLIF diagnostic. Fluctuation detection limits for tracer mole fraction were investigated by applying the diagnostic to an atmospheric temperature and pressure nitrogen jet seeded with 4% toluene, and detection limits of better than 1% of the maximum toluene mole fraction were achieved for detection of fluorescence signal at a point, along a line, and over a plane. The diagnostic was also demonstrated on a turbulent jet for line and planar detection and demonstrated the potential for toluene time-resolved PLIF diagnostics with CW lasers.
Author : Natalia Adrienne MacDonald
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (795 download)
Download or read book Laser Induced Fluorescence Characterization of Cusped Field Plasma Thrusters written by Natalia Adrienne MacDonald and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Cusped field plasma thrusters are a recent development in electrostatic propulsion, aimed at improving operation in the low power regime. Several diagnostic techniques have been employed to characterize these discharges. The present study focuses on the use of laser induced fluorescence to map ion velocities throughout the plumes of several cusped field thruster variants. Laser induced fluorescence provides the opportunity to probe small plasma sources with high spatial resolution, and is particularly useful for studying plasma propulsion devices where hot, energetic and highly non-uniform environments can adversely affect intrusive probes. The first half of this thesis focuses on time-averaged laser induced fluorescence velocimetry for three cusped-field thrusters. While a time-averaged velocity diagnostic is adequate in determining overall performance, it cannot resolve the dynamics seen in oscillatory modes of thruster operation. The second half of this research focuses on the development of an advanced CW laser induced fluorescence diagnostic technique, capable of correlating high frequency current fluctuations to the resulting fluorescence excitation lineshapes. This method is validated using simulations and a 60 Hz xenon spectral lamp. It is then applied to an oscillatory mode of the diverging cusped field thruster. Results show that the positions of the ionization and peak acceleration regions in the thruster vary over the course of a discharge current oscillation, causing the ion velocities to fluctuate in time. This new method of time-synchronized CW laser-induced fluorescence will be invaluable for better understanding the dynamics of thruster operation as well as other quasi-periodic oscillatory discharges, in fields from combustion to materials processing, among others.
Author : Anton Nikiforov
Publisher : BoD – Books on Demand
ISBN 13 : 1838802495
Total Pages : 146 pages
Book Rating : 4.8/5 (388 download)
Download or read book Atmospheric Pressure Plasma written by Anton Nikiforov and published by BoD – Books on Demand. This book was released on 2019-04-24 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plasma as the fourth state of matter is an ionized gas consisting of both negative and positive ions, electrons, neutral atoms, radicals, and photons. In the last few decades, atmospheric-pressure plasmas have started to attract increasing attention from both scientists and industry due to a variety of potential applications. Because of increasing interest in the topic, the focus of this book is on providing engineers and scientists with a fundamental understanding of the physical and chemical properties of different atmospheric-pressure plasmas via plasma diagnostic techniques and their applications. The book has been organized into two parts. Part I focuses on the latest achievements in advanced diagnostics of different atmospheric-pressure plasmas. Part II deals with applications of different atmospheric-pressure plasmas.
Author : Ji Hyung Yoo
Publisher : Stanford University
ISBN 13 :
Total Pages : 151 pages
Book Rating : 4.F/5 ( download)
Download or read book Strategies for Planar Laser-induced Fluorescence Thermometry in Shock Tube Flows written by Ji Hyung Yoo and published by Stanford University. This book was released on 2011 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis was motivated by the need to better understand the temperature distribution in shock tube flows, especially in the near-wall flow regions. Two main ideas in planar laser-induced fluorescence (PLIF) diagnostics are explored in this thesis. The first topic is the development of a single-shot PLIF diagnostic technique for quantitative temperature distribution measurement in shock tube flow fields. PLIF is a non-intrusive, laser-based diagnostic technique capable of instantaneously imaging key flow features, such as temperature, pressure, density, and species concentration, by measuring fluorescence signal intensity from laser-excited tracer species. This study performed a comprehensive comparison of florescence tracers and excitation wavelengths to determine the optimal combination for PLIF imaging in shock tube flow applications. Excitation of toluene at 248nm wavelength was determined to be the optimal strategy due to the resulting high temperature sensitivity and fluorescence signal level, compared to other ketone and aromatic tracers at other excitation wavelengths. Sub-atmospheric toluene fluorescence yield data was measured to augment the existing photophysical data necessary for this diagnostic technique. In addition, a new imaging test section was built to allow PLIF imaging in all regions of the shock tube test section, including immediately adjacent to the side and end walls. The signal-to-noise (SNR) and spatial resolution of the PLIF images were optimized using statistical analysis. Temperature field measurements were made with the PLIF diagnostic technique across normal incident and reflected shocks in the shock tube core flow. The resulting images show uniform spatial distribution, and good agreement with conditions calculated from the normal shock jump equations. Temperature measurement uncertainty is about 3.6% at 800K. The diagnostic was also applied to image flow over a wedge. The resulting images capture all the flow features predicted by numerical simulations. The second topic is the development of a quantitative near-wall diagnostic using tracer-based PLIF imaging. Side wall thermal boundary layers and end wall thermal layers are imaged to study the temperature distribution present under constant pressure conditions. The diagnostic technique validated in the shock tube core flow region was further optimized to improve near-wall image quality. The optimization process considered various wall materials, laser sheet orientations, camera collection angles, and optical components to find the configuration that provides the best images. The resulting images have increased resolution (15[Mu]m) and are able to resolve very thin non-uniform near-wall temperature layers (down to 60[Mu]m from the surface). The temperature field and thickness measurements of near-wall shock tube flows under various shock conditions and test gases showed good agreement with boundary layer theory. To conclude this thesis, new applications and future improvements to the developed PLIF diagnostic technique are discussed. These suggested refinements can provide an even more robust and versatile PLIF imaging technique capable of measuring a wider range of flow conditions near walls.
Author : Sune Svanberg
Publisher : Springer Science & Business Media
ISBN 13 : 3642973981
Total Pages : 418 pages
Book Rating : 4.6/5 (429 download)
Download or read book Atomic and Molecular Spectroscopy written by Sune Svanberg and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt: A wide-ranging review of modern techniques in atomic and molecular spectroscopy. A brief description of atomic and molecular structure is followed by the relevant energy structure expressions. A discussion of radiative properties and the origin of spectra leads into coverage of X-ray and photoelectron spectroscopy, optical spectroscopy, and radiofrequency and microwave techniques. The treatment of laser spectroscopy investigates various tunable sources and a wide range of techniques characterized by high sensitivity and high resolution. Throughout this book, the relation between fundamental and applied aspects is shown, in particular by descriptions of applications to chemical analysis, photochemistry, surface characterisation, environmental and medical diagnostics, remote sensing and astrophysics.
Author : Irving P. Herman
Publisher : Elsevier
ISBN 13 : 0080538088
Total Pages : 815 pages
Book Rating : 4.0/5 (85 download)
Download or read book Optical Diagnostics for Thin Film Processing written by Irving P. Herman and published by Elsevier. This book was released on 1996-10-23 with total page 815 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume describes the increasing role of in situ optical diagnostics in thin film processing for applications ranging from fundamental science studies to process development to control during manufacturing. The key advantage of optical diagnostics in these applications is that they are usually noninvasive and nonintrusive. Optical probes of the surface, film, wafer, and gas above the wafer are described for many processes, including plasma etching, MBE, MOCVD, and rapid thermal processing. For each optical technique, the underlying principles are presented, modes of experimental implementation are described, and applications of the diagnostic in thin film processing are analyzed, with examples drawn from microelectronics and optoelectronics. Special attention is paid to real-time probing of the surface, to the noninvasive measurement of temperature, and to the use of optical probes for process control. Optical Diagnostics for Thin Film Processing is unique. No other volume explores the real-time application of optical techniques in all modes of thin film processing. The text can be used by students and those new to the topic as an introduction and review of the subject. It also serves as a comprehensive resource for engineers, technicians, researchers, and scientists already working in the field. The only volume that comprehensively explores in situ, real-time, optical probes for all types of thin film processing Useful as an introduction to the subject or as a resource handbook Covers a wide range of thin film processes including plasma etching, MBE, MOCVD, and rapid thermal processing Examples emphasize applications in microelectronics and optoelectronics Introductory chapter serves as a guide to all optical diagnostics and their applications Each chapter presents the underlying principles, experimental implementation, and applications for a specific optical diagnostic
Author : M. Sassi
Publisher :
ISBN 13 :
Total Pages : 19 pages
Book Rating : 4.:/5 (227 download)
Download or read book Doppler Shift Methods for Plasma Diagnostics written by M. Sassi and published by . This book was released on 1987 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: Work to develop novel advanced laser spectroscopy plasma diagnostic methods is described. The methods are based on observing the doppler shift in the absorption liners of ionic species. Two methods under study are Velocity Modulated Laser Spectroscopy and Two Beam Doppler Shift Laser Spectroscopy. The theoretical basis of the methods is described and preliminary experimental results presented. Keywords: Laser diagnostics, Plasmas, Laser induced fluorescence, Doppler shift spectroscopy.
Author : A. B. Wedding
Publisher :
ISBN 13 :
Total Pages : 63 pages
Book Rating : 4.:/5 (227 download)
Download or read book Detection of Excited States by Laser-Induced Fluorescence and Analysis of Energy Transfer written by A. B. Wedding and published by . This book was released on 1988 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this research is to develop diagnostics and models required for measurement and prediction of the properties of electrical discharges in molecular gases. Discharges in molecular gases are important in Air Force technology because of their use in devices such as plasma processors, high power switches, and negative ion sources and because of their role in phenomena such as corona and lightning. The research program includes; a) the development and application of laser fluorescence and absorption techniques to the measurement of excited state densities in electric discharges, b) the measurement of the properties of the excited states of importance in molecular discharges of current interest, c) the application of various diagnostic techniques to the determination of the characteristics of moderate current density, transient electrical discharges, and d) the quantitative comparison of these results with appropriate discharge models. Keywords: Hydrogen, Nitrogen, Metastables, Electrons, Radiation, Excitation coefficient, Excited states. (MJM).
Author : C. Fotakis
Publisher : Springer Science & Business Media
ISBN 13 : 364256965X
Total Pages : 365 pages
Book Rating : 4.6/5 (425 download)
Download or read book Optics and Lasers in Biomedicine and Culture written by C. Fotakis and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 365 pages. Available in PDF, EPUB and Kindle. Book excerpt: Following the previous OWLS conferences devoted to optics in life sciences, the 5th Conference focused on recent achievements in applying lasers and optics in biomedicine and in the preservation of our cultural heritage. Particular attention is thus paid to laser diagnostics in medicine, interaction of laser radiation with biological tissue, and the development of new systems for these studies. The contributors to this volume cover such international research activities as photon migration in tissue, fibre optics, lasers in dermatology, ENT, cardiology, and in art conservation, imaging techniques in archaeology, laser technologies in contemporary art, and new laser and opto-electronic systems for biomedical and art-related studies.
