Download or read book Coherent Anti Stokes Raman Spectroscopy CARS Gas Temperature Measurements in a Monodisperse Combusting Droplet Stream written by JunYong Zhu and published by . This book was released on 1991 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Coherent Raman Spectroscopy Applications And New Developments Proceedings Of The Xi European Cars Workshop written by F Castellucci and published by World Scientific. This book was released on 1993-02-09 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt: The meeting was a forum on the 'state of the art' of the fundamental aspects and the applications of Coherent Antistokes Raman Scattering (CARS) and related nonlinear optic techniques.This volume contains the works of outstanding scientists from the most distinguished research centers of universities, public and private institutions in Europe and other countries, who work on the theory and application of nonlinear laser spectroscopic techniques to the study of gas combustion kinetics, noninterfering flame temperature measurements, high temperature reactors, plasmas and the exciton and vibrational dynamics in condensed phases.

Download or read book Coherent Anti Stokes Raman Spectroscopy CARS written by and published by . This book was released on 1993 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coherent Anti-Stokes Raman Spectroscopy (CARS) has been accepted as a very useful tool in combustion diagnostics. CARS is an optical technique in which two powerful laser beams are brought to a focus over a very small region in a medium usually a flame. This produces an output laser-like beam arising from a specific interaction of the laser radiation with the molecules of the gases in the flame and the spectral characteristics of this beam contains information about the temperature and species present in the focal volume. The relevant information from the CARS spectra can be extracted only by comparing it with theoretically calculated spectra. A complex software package was developed for generating the theoretical CARS spectra and for analyzing the experimental spectra. This report describes the tasks undertaken to enhance the capabilities of the existing CARS software package with the aim of detecting species such as NO and O2.

Download or read book ASME Technical Papers written by and published by . This book was released on with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Paper written by and published by . This book was released on 1992 with total page 800 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Coherent Anti stokes Raman Spectroscopy System for Point Temperature and Major Species Concentration Measurement written by and published by . This book was released on 1993 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Coherent anti-Stokes Raman Spectroscopy system (CARS) has been developed as a laser-based, advanced, combustion-diagnostic technique to measure temperature and major species concentration. Principles of operation, description of the system and its capabilities, and operational details of this instrument are presented in this report.

Download or read book Ultrabroadband Coherent Anti Stokes Raman Scattering for Gas Temperature and Concentration Measurements written by Yang Ran and published by . This book was released on 2021* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this work was to investigate and extend the capability of the ultrabroadband CARS technique for temperature and concentration measurements for multiple species and a wide range of practical applications, especially for gasification diagnostics. Practical gasification or combustion devices mainly work under high pressures. Therefore, a sufficiently short probe pulse (~2 ps) was utilized for collision-free measurements. In order to simultaneously excite multiple gas species with Raman shifts up to ~4200 cm-1, a ~7 fs pump/Stokes beam was used. Both beams are generated by a 200 kHz BBO-based OPCPA system. Based on this configuration, the experimental methods and the theoretical framework for temperature and concentration determination were developed. The accuracy and precision of this technique was at first determined in a gas oven with controlled temperatures and gas flows. In this way, temperature measurements at temperatures from 295 K up to ~1300 K were performed with excellent accuracies within ~4%. The CO detection limit in CO2 atmosphere was extended to 0.5% at room temperature and 2% at 1073 K at a pressure of 1.4 bar. Temperature and concentration measurements were further extended to 20 bar and 10 bar, respectively. The influence of the ultrabroadband spectrum on the excitation efficiencies was investigated in detail. Subsequently, ultrabroadband CARS technique was applied for the first time for coal gasification investigations. Successful CARS analytical results were obtained even for the gasification process of a single coal particle.

Download or read book Coherent Raman Spectroscopy written by Emilio M. Castellucci and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Gas Diagnostic Measurements by Coherent Anti Stokes Raman Spectroscopy written by R. L. St. Peters and published by . This book was released on 1980 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coherent anti-Stokes spectroscopy (CARS) can be considerably simpler than is suggested by literature analyses based on interactions of monochromatic waves. The simplification arises when the optical properties of real lasers are incorporated into the analysis. To incorporate these properties, it is necessary to recognize that the underlying nonlinear optical interaction has a previously ignored complexity and is dependent on the coherence properties of the fields as well as on their spectra. The coherence of the interaction, as described by the CARS linewidth parameter, is degraded by the imperfect coherence of the laser sources. The occurrence of the nonlinear interaction depends on the small size of laser mode widths, or more fundamentally, on the statistical degeneration of each incident field into a small number of independent fields, a property possessed only by optical fields from lasers. If the lasers' contributions to the linewidth parameter are made dominant, the degree of coherence becomes a fixed property of the apparatus, simplifying interpretation of CARS spectra and extending the range of usefulness of CARS well beyond what would otherwise be expected. Available numerical values plus considerations of effects such as mode frequency chirp suggest that domination of the coherence by the apparatus can be arranged or at least approached in most cases.

Download or read book Application of Coherent Anti Stokes Raman Scattering to Combustion Media written by Larry P. Goss and published by . This book was released on 1981 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: A laboratory-based system utilizing the Nd:YAG laser has been developed to investigate the Coherent Anti-Stokes Raman Scattering (CARS) of molecular gases in combustion. Single-shot and simultaneous experimental measurements of species concentration and temperature of combustion media are reported and compared with other optical techniques and theoretical predictions. The adverse effects of beam propagation through turbulence are investigated and discussed. A transportable hardened CARS system, constructed to operate in adverse environments, has been used to conduct a series of investigations in a practical combustion tunnel. Temperature and number-density measurements made as a function of fuel-air flow, position in the combustion tunnel, and fuel variation--including both gaseous and liquid fuels--are reported. (Author).

Download or read book Accurate Measurements of Combustion Species Concentrations Using CARS Coherent Antistokes Raman Scattering written by R. L. Farrow and published by . This book was released on 1986 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present results of research at the Combustion Research Facility, Sandia National Lab., on improving the capabilities of coherent anti-Stokes Raman spectroscopy (CARS) for species concentration measurements in combustion gases. Scanning CARS experiments based on single- and multi-mode Nd:YAG lasers, and on pulse-amplified and conventional pulsed dye lasers have been used to evaluate an in situ normalization technique, to measure Raman linewidths in flames, and to determine nonresonant electronic susceptibilities. We discuss experimental and theoretical considerations affecting concentration measurement accuracy.

Download or read book Time resolved Coherent Anti Stokes Raman Spectroscopy CARS and the Measurement of Vibrational Spectra in Shock compressed Molecular Materials written by and published by . This book was released on 1990 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present the use of coherent anti-Stokes Raman scattering (CARS) in conjunction with a two-stage light-gas gun to obtain vibrational spectra of shock-compressed liquid N2, O2, CO, and their mixtures. The experimental spectra are compared to spectra calculated using a semiclassical model for CARS intensities to obtain vibrational frequencies, peak Raman susceptibilities, and linewidths. The derived spectroscopic parameters suggest thermal equilibrium of the vibrational populations is established in less than a few nanoseconds after shock passage. Vibrational temperatures obtained are compared to those derived from equation-of-state calculations. Shifts in the vibrational frequencies reflect the influence of increased density and temperature on the intramolecular motion. 11 refs., 5 figs.

Download or read book Analysis of Lean Premixed Turbulent Combustion Using Coherent Anti stokes Raman Spectroscopy Temperature Measurements written by Daniel V. Flores and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Previews of Heat and Mass Transfer written by and published by . This book was released on 1993 with total page 630 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Study of Temperature Measurement Using Coherent Anti Stokes Raman Spectroscopy written by F. M. Porter and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Coherent Raman Spectroscopy written by Emilio M. Castellucci and published by World Scientific Publishing Company Incorporated. This book was released on 1993-01-01 with total page 267 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Single Beam Coherent Anti Stokes Raman Scattering Spectroscopy of N2 Using a Shaped 7 Fs Laser Pulse written by and published by . This book was released on 2009 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The feasibility is explored by single-beam coherent anti-Stokes Raman scattering CARS spectroscopy of gas-phase diatomic molecules related to combusting flows, with implications for gas-phase thermometry. We demonstrate CARS of gas-phase N2 using a shaped 7 fs laser pulse, investigate the dependence of the CARS signal on the total pressure of the probed environment, both in pure N2 and in mixtures with Ar, discuss the observed signal-to-noise ratio, and suggest improvements to be considered for reliable single-shot measurements at flame temperatures.