Download or read book The Development of a Vacuum ultraviolet Photofragmentation laser Induced Fluorescence Sensor for Atmospheric NH3 and Other Trace Gases written by Douglas Dale Davis and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Vacuum ultraviolet Photofragmentation laser induced Florescence Trace Gases written by Douglas Dale Davis and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book UV Laser Induced Fluorescence Detection of the Atmospheric Trace Gases NO SO2 CH2O written by Douglas Dale Davis and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Studies of Vacuum Ultraviolet Laser Probing of Gas surface Interactions and Gas Phase Photodissociation Reactions written by Larry Lee Springsteen and published by . This book was released on 1998 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Vacuum Ultraviolet Photoionization and Photodissociation of Molecules and Clusters written by Cheuk-Yiu Ng and published by World Scientific. This book was released on 1991 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph reviews the recent progress in vacuum ultraviolet (VUV) photoionization and photodissociation processes. Photoionization, photoelectron, and fluorescence spectroscopic techniques have played an important role in revealing the photoionization and photodissociation dynamics of molecules in the vacuum ultraviolet region and in providing accurate energetic and spectroscopic information of ions as well as neutral molecules. The book represents the first detailed review of major experimental developments in the studies of single vacuum ultraviolet photon ionization and dissociation processes of gaseous molecules and clusters.
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.
Download or read book AMS Newsletter written by American Meteorological Society and published by . This book was released on 1983 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book New Vacuum Ultraviolet Emission Continua in the Rare Gases written by Robert E. Huffman and published by . This book was released on 1961 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several new vacuum ultraviolet-emission continua recently observed in the spectra of the rare gases helium, argon, and xenon are discussed. These spectra were produced with a windowless light source operated as a repetitive condensed discharge and equipped with a differential pumping system to separate the high pressure (up to 800 mm Hg of helium) light source from the 2-m vacuum spectrograph (pressure 1/1000 mm Hg). In helium two continua were observed at pressures above 150 mm in addition to the weaker 600 to 950 angstroms continuum. The brightest extends from about 1050 to above 4000 angstroms and seems connected with greatly enhanced lines of He(II). The other continuum is the completely broadened principal series extending from 584 to about 510 angstroms and containing broadened principal series absorption lines. With argon in a flow system or xenon isolated with a LiF window, previously observed continua were extended from their resonance lines to beyond 3000 angstroms. Details of the experimental observations and possible explanations of these continua are presented. (Author).
Download or read book Rare Gas Continuum Light Sources for Photoelectric Scanning in the Vacuum Ultraviolet written by Robert E. Huffman and published by . This book was released on 1966 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ultraviolet Spectroscopy And Uv Lasers written by Prabhakar Misra and published by CRC Press. This book was released on 2002-02-25 with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents a complete and thorough examination of advances in the instrumentation, evaluation, and implementation of UV technology for reliable and efficient data acquisition and analysis. It provides real-world applications in expanding fields such as chemical physics, plasma science, photolithography, laser spectroscopy, astronomy and atmospheric science.
Download or read book Development of a Photofragmentation laser Induced Fluorescence PF LIF Laser Sensor for Detection of 2 4 6 trinitrotolue written by Gary Michael Boudreaux and published by . This book was released on 1997 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of a Two photon laser Induced Fluorescence Sensor for the Detection of Atmospheric OH Radicals written by John David Bradshaw and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Techniques of Vacuum Ultraviolet Spectroscopy written by James A. R. Samson and published by V U V Associates. This book was released on 1967 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Study of Scattering and Fluorescence of Gases in the Vacuum Ultraviolet written by and published by . This book was released on 1970 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements of spectral absorption and photoionization cross sections of CO2, NH3, O2, COS, NO, N2, and vinyl chloride in the region 580 - 1650 A were made. A number of new Rydberg series were found and the convergence limits were compared with the photoionization values. In the study of dispersed fluorescence from molecules, particular attention was given to the emissions from CO, NH3, N2, and NO in the spectral region 1800 to 6000 A. The experimental Franck-Condon theoretical values. The excitation spectra of NO show many overlapping states. The excitation spectra of other molecules such as H2, O2, and SO2 were studied, and certain features of the emission spectra can be related to the spectral absorption. The effect of molecular collisions on the fluorescence of NO was investigated.
Download or read book Development of Fiber laser based Laser induced Fluorescence for Detection of SO2 written by and published by . This book was released on 1998 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gaining a quantitative understanding of many aspects of the earth's climate system requires development of new detection methods for key atmospheric species and their incorporation into chemical sensors with high sensitivity, specificity, and time response. The authors have initiated a research program to develop these new chemical-sensing capabilities. The species they have targeted initially are oxides of nitrogen and sulfur, specifically NO and S02 These molecules play a central role in the earth's climate, and anthropogenic activities (primarily fossil-fuel combustion) are the dominant source of both species. They are exploring the use of single-mode fiber lasers and amplifiers as compact, lightweight sources of tunable, narrow-bandwidth, deep-UV radiation. They have also begun spectroscopic studies to optimize UV laser-induced fluorescence for detection of S02 with high sensitivity and specificity.
Download or read book Strategies for Planar Laser induced Fluorescence Thermometry in Shock Tube Flows written by Ji Hyung Yoo and published by . This book was released on 2011 with total page 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.
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:
