Download or read book Notes on Rayleigh and Raman scattering for measurement of gas temperature and concentration written by P. Hutchinson and published by . This book was released on 1982 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Determination of Gas Temperatures from Laser Raman Scattering written by Jack A. Salzman and published by . This book was released on 1971 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation was conducted on the feasibility of using Raman scattered laser light to measure local gas temperatures. Temperature error predictions were made based on the statistics of the scattering process and Raman spectral theory. Methods were developed for the calculation of temperature measurement accuracies as a function of Raman signal for different spectral line ratio schemes. The results of these theoretical calculations were compared with experimental rotational Raman data obtained from a laboratory-constructed Raman spectrophotometer. Nitrogen was used as a gas sample for a range of controlled temperatures from 253 to 313 K and pressures from 0. 5 to 5.0 atmospheres.
Download or read book A Rotational Raman Scattering System for Measuring Temperature and Concentration Profiles in Transient Gas Flows written by James Raymond Smith and published by . This book was released on 1975 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 The Rayleigh and Raman Scattering written by George Placzek and published by . This book was released on 1959 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book On the Measurement of Rayleigh Scattering by Gases at 6328 written by Shardanand Gupta and published by . This book was released on 1973 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Note written by and published by . This book was released on 1971 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Application of Spontaneous Raman Scattering for Measurements of Thermal Non equilibrium in High speed Mixing and Combustion written by Heath Heinrich Reising and published by . This book was released on 2017 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mixing-induced vibrational non-equilibrium is studied in the turbulent shear layer between a high-speed jet and a surrounding hot-air coflow. The vibrational and rotational temperatures of N2 and O2 are determined by fitting measured spontaneous Raman scattering spectra to a model that allows for different equilibrium distributions of the vibrational and rotational states. The mixing of the jet fluid with the coflow gases occurs over microsecond time scales, which is sufficiently fast to induce vibrational non-equilibrium in the mixture of hot and cold gases. I measured the non-equilibrium on the hot side of the shear layer, but not on the cold side where the vibrational population in the first hot band is negligible. The effect of fluctuating temperatures on the time-averaged Raman measurement was quantified using single-shot Rayleigh thermometry. The Raman scattering results were found to be insensitive to fluctuations except where the flame is present intermittently. It was also found that the measured non-equilibrium increases in the shear layer when N2 is removed from the jet fluid, indicating that the measurements average two competing processes that occur simultaneously at a molecular scale: vibrationally hot N2 cooled by the fast jet fluid and vibrationally cold jet fluid heated by a hot coflow. An interesting inference is that the averaging effect is always present, regardless of the measurement resolution. No measurable vibrational non-equilibrium is found in the O2 molecules in the same non-reacting regions. This difference between species temperatures violates the two-temperature assumption often used in the modeling of high-temperature non-equilibrium flow. A new technique was developed to obtain spontaneous Raman scattering temperature measurements from a single laser pulse. This technique required the construction of a multiple-pass cell to obtain adequate scattered signal. Additionally, the pulse was stretched temporally with a system of partial reflectors and time-flight-delay ring cavities in order to reduce the peak power of the 1 J laser pulses. These measurements were found to be in agreement with the previous time-average results and allowed for measurement to be made near the fluctuating base of a lifted flame – a region where time-averaged measurements do not give meaningful results.
Download or read book Laser Raman Gas Diagnostics written by Marshall Lapp and published by Springer Science & Business Media. This book was released on 2013-03-14 with total page 387 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Laser Raman Workshop on the r"eas urement of Gas Properti es i sone of aseries of occasional meetings organized in an informal workshop format through the stimulation of Project SQUID, Office of Naval Research. This workshop is the second to be organized on gas-phase applications of Raman scattering. Both Raman workshops were supported by Project SQUID, ONR, and the Air Force Aero Propulsion Laboratory, Wright-Patterson Air Force Base. The first Raman Workshop was held at the AVCO Everett Research Laboratory, Everett, Massachusetts, with their co-sponsorship in January 1972 under the chairmanship of D. A. Leonard. The present meeting was co-sponsored by the General Electric Research and Development Center, and held at their facility in Schenectady, New York. We are grateful to Project SQUID, AFAPL, and GE for their generous financial support of this Workshop, and to Project SQUID for underwriting the publication costs of the Proceedings. As is always the case for successful meetings, many people contributed substantially to the organization and execution of this workshop. Professor Robert Goulard supported, aided, and encouraged us in the most helpful ways, and we are indebted to him. We received further valuable support and assistance from Dr. Ralph Roberts, Director, and Mr. James R. Patton, Jr., of the Power Branch, Office of Naval Research; from Dr. William H. Heiser, Chief Scientist of the Aero Propulsion Laboratory; and from Dr. James M.
Download or read book Rayleigh and Raman Scattering for Density in a Swirling Flow Combustor written by Rangasayi Narayan Halthore and published by . This book was released on 1984 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Determination of the Temperature of Gas Mixtures by Using Laser Raman Scattering written by Thom A. Coney and published by . This book was released on 1973 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: A theoretical model for the Raman rotational spectrum of air was formulated, yielding the spectral temperature dependence; and an error analysis of temperature measurement accuracies was performed. The theoretical spectra and the predicted temperature measurement error of + or - 20 K (7 percent) compared well with experimental data. These experimental data consisted of Raman spectra of air obtained for temperatures ranging from 243 to 313 K at a pressure of 1 atmosphere. The use of selected lines resulted in an experimental accuracy of + or - 13 K (-5 percent).
Download or read book Traveling Pulse Stimulted Raman Scattering written by Brian Edwin Kincaid and published by . This book was released on 1975 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Rayleigh Scattering Diagnostic for Measurement of Temperature and Velocity in Harsh Environments written by Richard G. Seasholtz and published by . This book was released on 1998 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Publications written by Great Britain. Her Majesty's Stationery Office and published by . This book was released on 1982 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Traveling Pulse Stimulated Raman Scattering written by Brian Edwin Kincaid and published by . This book was released on 1975 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gas Diagnostics Utilizing Laser Induced Raman Scattering written by Anthony A. Boiarski and published by . This book was released on 1972 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Atom written by and published by . This book was released on with total page 996 pages. Available in PDF, EPUB and Kindle. Book excerpt:
