Download or read book Diagnostics for Mapping a Laser induced Plasma written by Daniel Shelby and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal here, then, is to develop a unified system that can interrogate these LIP's with as many spectroscopy techniques as is possible. Each technique lends more insight into the spatial and temporal structure within the plasma. A spatially selective emission strategy alongside two laser probe methods are evaluated for the purpose of mapping the plasma's evolution in space and time. Moreover, by using a fast detector coupled with fast electronics, an attempt at the direct experimental evaluation of time-resolved collisional rate constants at several delays of plasma evolution is described. This is believed to be the first time such an attempt has been made within a LIBS plasma.
Download or read book Plasma Imaging as a Diagnostic Tool for Laser induced Breakdown Spectroscopy written by Jessica Mcnutt and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Laser-induced breakdown spectroscopy (LIBS) has been identied as a promising technique for the detection and characterization of nuclear materials and other materials relevant for nuclear forensics and international safeguards applications. LIBS is a material characterization method whereby a short-pulse, high-intensity laser is focused on the surface of a target to generate a plasma for spectral analysis to determine the elemental and potentially isotopic composition of the target. Shadowgraphic and fast-frame photographic imaging are two established techniques used to study the time-evolution and the rate of expansion of laser-produced plasmas over hundreds of nanoseconds. The modication of a LIBS experimental setup to include the capability to take photographic images and high-temporal resolution shadowgraphic images is presented. Analysis of uranium samples was performed in air and vacuum conditions. Shadowgraphic imaging was used to analyze laser produced plasma evolution in the rst 8 ns following laser-energy deposition on the surface. Algorithms were developed to measure the plasma radius as a function of time and the results of that analysis were compared to the Sedov-Taylor model.
Download or read book Laser Aided Diagnostics of Plasmas and Gases written by K Muraoka and published by CRC Press. This book was released on 2016-04-19 with total page 307 pages. Available in PDF, EPUB and Kindle. Book excerpt: Updated and expanded from the original Japanese edition, Laser-Aided Diagnostics of Gases and Plasmas takes a unique approach in treating laser-aided diagnostics. The book unifies the subject by joining applications instead of describing each application as a totally separate system. In taking this approach, it highlights the relative strengths of
Download or read book Diode Laser Diagnostics of Laser induced Plasmas and Atomic Vapor Cells written by Benoît Lauly and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Cesium atomic vapor filters or detectors have been a primary focus of this work as they demonstrate the potential to excel both in terms of spectral resolution and sensitivity. Atomic vapor detectors have a spectral resolution that is governed by the properties of the atomic vapor used as the sensing element, while maintaining the same value of the luminosity. Cesium vapor cells have been extensively investigated because of cesium's high number density at low temperature and its strong resonance transition in the near-infrared at 852nm (62S1/2 [if.then] 62P3/2). A promising fluorescence scheme for cesium has been demonstrated here that includes a single transition at 852nm and fluorescence detection at 894nm (62P1/2 [if.then] 62S1/2). For efficient detection, a rapid fine-structure mixing (62P3/2 [if & only if] 62P1/2) is required and is provided by the presence of ethane in the cell. The absorption properties of this cell are reported as well as its potential application to a selected analytical problem such as the detection of Raman photons.
Download or read book Spectral Line Broadening by Plasmas written by Hans Griem and published by Elsevier. This book was released on 2012-12-02 with total page 425 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spectral Line Broadening by Plasmas deals with spectral line broadening by plasmas and covers topics ranging from quasi-static approximation and impact approximation to intermediate approximations and correlation effects. Experimental results for hydrogen lines, lines with forbidden components, and ionized helium lines are presented. Applications such as density and temperature measurements are also considered. Comprised of four chapters, this volume begins with an overview of the effects of electric fields from electrons and ions (both acting as point charges) on spectral line shapes. The next chapter surveys theoretical work, paying particular attention to quasi-static, impact, and intermediate approximations as well as correlation effects. Stark broadening experiments are then discussed, with special emphasis on experiments capable of checking the accuracy or validity limits of the various approximations. The final chapter is devoted to applications in laboratory plasma physics and astronomy, focusing on density and temperature measurements and opacity calculations as well as the analysis of stellar atmospheres, amplitudes and spectra of plasma waves, and radio frequency lines. This book should appeal to students, practitioners, and researchers in pure and applied physics.
Download or read book Laser Diagnostics for Combustion Temperature and Species written by Alan C. Eckbreth and published by CRC Press. This book was released on 2022-01-27 with total page 630 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book examines the variety of potential laser diagnostic techniques and presents a considerable theoretical foundation elucidating physics relevant to the laser diagnostics. It explains the Raman-based approaches for major species and temperature measurements.
Download or read book Diagnostic and Analytical Studies of Laser Induced Plasmas written by Heh Young Moon and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: Since its early applications, Laser-Induced Breakdown Spectroscopy (LIBS) has been recognized as a useful tool for solid state chemical analysis due to its numerous attractive advantages as an analytical tool: e.g., simultaneous multi-element detection capability, no sample preparation, rapid or real-time analysis, and allowing in situ analysis requiring only optical access to the sample. However, the quantitative accuracy of the technique depends on the complex fundamental processes involved in laser-induced plasma formation, ablation, atomization, excitation and ion recombination. Thus, problems arising from laser target coupling, matrix effects, line interferences, fractionation in target vaporization, the main assumptions of the methods, namely the optically thin emission of spectral lines and the existence of local thermodynamic equilibrium in the plasma should be properly addressed in order to obtain reliable quantitative results [1, 2] . The general scope of this research encompasses two aspects related to the LIBS technique: one aspect is the fundamental study of the plasma characteristics and another is an improved use of the technique in quantitative analysis. The main project is to revisit and investigate some fundamental assumptions such as the existence of local.
Download or read book Topics in Plasma Diagnostics written by I. Podgornyi and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present volume is essentially a qualitative survey of modern trends in the diagnostics of high-temperature plasmas, with particular orientation toward laboratory plasmas of interest in connection with research in controlled thermonuclear fusion. Among the broad topics considered are probe diagnostics, optical methods (including the use of lasers and holography), microwave diagnostics, and diagnostics with particle beams. Having infor mation on these methods available in compact form and in one place, as is the case in the present volume, should make it pos sible to evaluate different diagnostic approaches to specific prob lems. The volume will be useful as an introduction for advanced students making their first contact with experimental plasma physics and for physicists and engineers who are entering the field and desire a rapid survey of principles and modern trends in the diagnostics of high-temperature plasmas. v Foreword to the American Edition The material in this book is based on lectures given at Mos cow State University. It is intended to acquaint the reader with the basic aspects of plasma diagnostics and contains information re quired for the experimental physicist who wishes to carry out straightforward measurements of laboratory plasmas. It will be evident that in choosing the material we have been guided pri marily by the scientific interests of the author, and the great bulk of the material is based on work carried out in the USSR.
Download or read book Industrial Applications of Laser Diagnostics written by Yoshihiro Deguchi and published by CRC Press. This book was released on 2011-12-07 with total page 305 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tighter regulations of harmful substances such as NOx, CO, heavy metals, particles, emissions from commercial plants and automobiles reflect a growing demand for lowering the anthropogenic burdens on the environment. It is equally important to monitor controlling factors to improve the operation of industrial machinery and plants. Among the many methods for doing this, laser diagnostics stands out. Taking a practical approach, Industrial Applications of Laser Diagnostics discusses how to apply laser diagnostics to engines, gas turbines, thermal and chemical plant systems, and disposal facilities. It also briefly discusses their growing application in biochemical fields. The book introduces the guidelines for industrial applications of laser diagnostics, briefly describes the main components of laser diagnostics systems, and summarizes application codes of laser diagnostics to industrial systems. The author them discusses laser induced fluorescence, laser induced breakdown spectroscopy, spontaneous Raman spectroscopy and CARS, tunable diode laser absorption spectroscopy, and time of flight mass spectroscopy. He provides theoretical explanations and complex equations, which are usually main inhibitors, in appendices or indicates them with citations. Although the diagnostics have been well documented in the scientific literature, and the techniques in journals, the applications have not. And usually these books are comprehensible only to those in this field, not researchers from other fields or from industry. Until now. Incorporating a plethora of real life industrial examples and applications, this text underscores the real potential for these techniques in industrial applications.
Download or read book Laser Plasma Generation and Diagnostics written by Richard F. Haglund and published by SPIE-International Society for Optical Engineering. This book was released on 2000 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Laser Induced Plasmas Optical Diagnostics written by Magesh Thiyagarajan and published by . This book was released on 2011-11 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Diagnostics for the Detection and Evaluation of Laser Induced Damage written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Laser Damage and Conditioning Group at LLNL is evaluating diagnostics which will help make damage testing more efficient and reduce the risk of damage during laser conditioning. The work to date has focused on photoacoustic and scattered light measurements on 1064-nm wavelength HfO[sub 2]/SiO[sub 2] multilayer mirror and polarizer coatings. Both the acoustic and scatter diagnostics have resolved 10[mu]m diameter damage points in these coatings. Using a scanning stage, the scatter diagnostic can map both intrinsic and laser-induced scatter. Damage threshold measurements obtained using scatter diagnostics compare within experimental error with those measured using 100x Nomarski microscopy. Scatter signals measured during laser conditioning can be used to detect damage related to nodular defects.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of Laser plasma Diagnostics Using Ultrafast Atomic scale Dynamics 96 ERD 046 Final Report written by and published by . This book was released on 1997 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultrashort laser pulse systems allow examination of intense, ultrafast laser-plasma interactions. More specifically, intense laser irradiation can induce short xuv/x-ray bursts from the surface of condensed phase targets. Ultrafast xuv/x-ray detection is needed to understand laser-plasma interactions in this dynamic regime. Support of the Stockpile Stewardship and Management Program requires this critical understanding. Our effort here has been to extend understanding of atomic-scale dynamics in such environments with the goal of developing next generation ultrafast xuv/x-ray diagnostics where the sensors will be the atoms and ions themselves and the time resolution will approach that of the induced atomic transitions ((almost equal to) a few femtoseconds). Pivotal contributions to the rapidly developing field of highly nonperturbative interactions of ultrashort pulse lasers with atoms/ions have been made at this laboratory. In the visible/infrared wavelength regions the temporal and spectral content of ultrashort laser pulses are now reliably monitored within a single pulse using frequency resolved optical gating (FROG) which is based on rapid nonlinear optical processes such as the Kerr effect. New applications of this basic concept are still being developed. Corresponding detection for the xuv/x-ray wavelengths does not exist and is urgently needed in many laboratory programs. The FROG technique cannot be applied in the xuv/x-ray region. Current x-ray streak camera technology is limited to (almost equal to)0.5 picosecond resolution.
Download or read book In Situ Laser Ablation Plasma Diagnostics in the Film Growth Regime written by and published by . This book was released on 1990 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The propagation of the laser-induced plasma formed by KrF irradiation of Y1Ba2Cu3O-- has been characterized in background pressures of oxygen and argon typically used for thin film growth. The ion current transmitted through the background gases was recorded along the normal to the irradiated pellet as a function of distance in order to measure the decreasing velocity and magnitude of the expanding plasma current due to collisional slowing and attenuation of the laser plume. The integrated ion charge delivered to a substrate at low pressures can be described by elastic scattering giving a general integral cross sections of [sigma]{sub e}(O2) = 3.2 × 10−16 cm2 and [sigma]{sub e}(Ar) = 2.7 × 10−16 cm2. At higher pressures, inelastic scattering leads to increased recombination and reactive conversion of ions indicated by increased fluorescence of all the species, which becomes dominated by fluorescence of YO and BaO. Spatially resolved fluorescence measurements indicate that the luminous boundary to the plasma follows a weak shock front which coincides with the ion flux propagation. The ion transmission is found to drop exponentially with distance and background pressure, in agreement with a simple scattering model which yields general scattering cross sections for ion-argon [sigma]{sub i-Ar} = 2.1 × 10−16 cm2 and ion-oxygen [sigma]{sub i-O{sub 2}} = 2.3 × 10−16 cm2 interactions in background pressures up to 300 mTorr. The general features of the plume deceleration are described in terms of a drag force model. 9 refs., 5 figs.
Download or read book Laser Induced Plasma Diagnostics of Pulsed Laser Ablation in a Cavity written by and published by . This book was released on 2002 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optical and Laser Diagnostics written by C Arcoumanis and published by CRC Press. This book was released on 2003-06-20 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: From the automotive industry to blood flow monitoring, optical techniques and laser diagnostics are becoming integral parts in engineering and medical instrumentation. Written by leading global experts from industry, academic groups, and laboratories, this volume provides an international perspective on both existing applications and leading-edge research. With a focus on advanced engineering applications, the book discusses the application of techniques such as laser Doppler velocimetry, particle image velocimetry, and planar laser-induced fluorescence to automotive engines, burners, and gas turbines. It also covers the flow, sprays, and combustion in direct-injection gasoline engines as well as the fundamental structure of flames as revealed by complementary laser techniques. In addition, the book explores laser diagnostic techniques used in the biomedical field and reviews novel research on the use of fiber-optic sensor techniques for structural integrity and physical condition monitoring.
