Download or read book Development and Application of a Photofragmentation laser induced Fluorescence Detection System for Atmospheric Nitrous Acid written by Michael Owen Rodgers and published by . This book was released on 1987 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Photofragmentation laser induced Fluorescence Detection NO2 and NO written by John David Bradshaw and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Curricula in the Atmospheric Oceanic and Related Sciences written by and published by . This book was released on 1988 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dissertation Abstracts International written by and published by . This book was released on 1987 with total page 644 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Development and Application of Photofragmentation Laser induced Fluorescence for Visualization of Hydrogen Peroxides written by Olof Johansson and published by . This book was released on 2011 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Development of a Two Photon laser Induced Fluorescence Technique 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 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.

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 Technique for the Detection of Atmospheric OH Radicals written by John Bradshaw and published by . This book was released on 1990 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Rethinking the Ozone Problem in Urban and Regional Air Pollution written by National Research Council (U.S.). Committee on Tropospheric Ozone Formation and Measurement and published by . This book was released on 1991 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Development and Applications of Laser Enhanced Ionization Laser Induced Fluorescence and Photoionization Detection Systems for Trace Detection of Elements and Compounds of Environmental and Biological Significance written by Seth Aaron Elwood and published by . This book was released on 2001 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Development of a Laser induced Fluorescence Instrument for the in Situ Atmospheric Measurements of Iodine Monoxide written by Dick Tung Pall Co and published by . This book was released on 2007 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: Finally, the first rotationally resolved ultraviolet absorption cross sections for the 200410 vibrational band of the A1A2-X1A 1 electronic transition of formaldehyde (HCHO) are reported. Accurate rotationally resolved cross sections are of significant importance for the development of in situ HCHO LIF instruments and for atmospheric monitoring. HCHO is a prime tracer for convective events, and in situ measurements of HCHO will be complementary to the observational database of IO.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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:

Download or read book Development and Application of Infrared and Tracer based Planar Laser induced Fluorescence Imaging Diagnostics written by David A. Rothamer and published by . This book was released on 2007 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: IR-PLIF measurements of temperature and pressure are a new application of the technique. Initial IR-PLIF measurements focused on species concentrations of CO and CO2. The strong dependence of IR-PLIF signals on temperature and pressure indicated that IR-PLIF measurements of those quantities are possible.