Download or read book Laser induced Fluorescence and Amplified Spontaneous Emission Detection of Hydrogen Atoms in Flames written by Christopher R. Mahon and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Laser Induced Fluorescence and Ionization Techniques for Combustion Diagnostics written by BE. Forch and published by . This book was released on 1990 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: Light atomic species such as oxygen atoms (O) and hydrogen atoms (H) are fundamentally important in a wide variety of combustion-related phenomena such as flame ignition, propagation, extinction and in chemical flame reactions. Furthermore, they are difficult to detect by conventional laser based optical methods (laser induced fluorescence) in combustion environments because the necessary resonance excitation wavelengths fall far into the vacuum ultraviolet (vuv) and the requisite tunable laser sources are not generally available. However, recent developments in nonlinear spectroscopic techniques such as multiphoton induced emission (MPE) and multiphoton ionization (MPI) have made direct detection of these light atoms possible. We have utilized a number of laser multiphoton excitation schemes for their detection using tunable lasers in the 190 to 400 nm range. Similar diagnostic techniques were attempted for the detection of carbon (C) and nitrogen (N) atoms in flames. The effects of laser induced photochemical pertubations on species detection in flames were also investigated. These nonlinear spectroscopic techniques have been demonstrated to be very useful in combustion studies but special care needs to be taken with respect to possible perturbations that may result from the use of short-wavelength lasers.

Download or read book International Aerospace Abstracts written by and published by . This book was released on 1996 with total page 970 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nonlinear Laser Diagnostics for Combustion and Plasma Processes written by and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Significant milestones for quantitative laser-based diagnostics of reacting flows were reached on two separate tasks: (1) the extension of laser-based diagnostics to shorter vacuum ultraviolet (vuv) wavelengths and (2) the development of amplified spontaneous emission (ASE) diagnostics for light atoms. For the first task, phase-matching was applied to produce significant increases in vuv laser intensities, producing over 5 mu J at Lyman alpha (121.6 nm) in a mixture of krypton and argon. Factors affecting the long-term stability of vuv powers were studied. The diagnostic potential of two-photon excited ASE of atomic hydrogen and oxygen was explored in a variety of low-pressure flames. Direct ASE gain measurements gave oxygen concentrations. A model of the ASE signal was developed, and a new understanding of both ASE and laser-induced fluorescence of two-photon excited atoms emerged from this model.

Download or read book A Numerical Model of Laser Induced Fluorescence in a Hydrogen Plasma written by Marc R. Hallada and published by . This book was released on 1990 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book 34th Aerospace Sciences Meeting Exhibit written by and published by . This book was released on 1996 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Interference Free Laser Induced Fluorescence Imaging of Atomic Hydrogen in Flames written by and published by . This book was released on 2007 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Imaging Hydrogen Flames by Two photon Laser induced Fluorescence written by R. Miles and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Laser Based Multiphoton Excitation Processes in Combustion Diagnostics written by and published by . This book was released on 1990 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: Light atomic species such as oxygen atoms (O) and hydrogen atoms (H) are fundamentally important in a wide variety of combustion related phenomena such as flame ignition, propagation, extinction, and in chemical flame reactions. Furthermore, they are difficult to detect by conventional laser based optical methods (laser induced fluorescence) in combustion environments because the necessary resonance excitation wavelengths fall far into the vacuum ultraviolet (vuv) and the requisite tunable laser sources are not generally available. However, recent developments in nonlinear spectroscopic techniques such as multiphoton induced emission (MPE) and multiphoton ionization (MPI) have made direct detection of these light atoms possible. We have utilized a number of laser multiphoton excitation schemes for their detection using tunable lasers in the 190-400 nm range. Similar diagnostic techniques were attempted for the detection of carbon (C) and nitrogen (N) atoms in flames. The effects of laser induced photochemical perturbations on species detection in flames were also investigated. Keywords: Atoms, Laser induced fluorescence, Multiphoton ionization, Optogalvanic, Flames, Fuel, Oxidizer, Laser, Dye laser.

Download or read book ARO and AFOSR Contractors Meeting in Chemical Propulsion Held in Virginia Beach Virginia on 3 6 June 1996 written by David M. Mann and published by . This book was released on 1996 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: Partial contents: Supercritical droplet behavior; Fundamentals of acoustic instabilities in liquid-propellant rockets; Modeling liquid jet atomization proceses; Liquid-propellant droplets dynamics and combustions in supercritical forced convective environments; Contributions of shear coaxial injectors to liquid rocket motor combustion instabilities; High pressure combustion studies under combustion driven oscillatory flow conditions; Droplet collision on liquid propellant combustion; Combustion and plumes; Development of a collisional radiative emission model for strongly nonequilibrium flows; Energy transfer processes in the production of excited states in reacting rocket flows; modeling nonequilibrium radiation in high altitude plumes; kinetics of plume radiation, and of HEDMs and metallic fuels combustion; Nonsteady combustion mechanisms of advanced solid propellants; Chemical mechanisms at the burning surface. p15

Download or read book The Finding Guide to AIAA Meeting Papers written by American Institute of Aeronautics and Astronautics. Technical Information Service and published by . This book was released on 1996 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Study of Laser induced Fluorescence Back scattered Amplified Stimulated Emission of Bulk Vapors written by Jeffrey B. Oleske and published by . This book was released on 2012 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: A method for the stand-off detection of vapors based on the observation of laser-induced fluorescence back-scattered amplified stimulated emission (LIF-BASE) is described. LIF-BASE generates uniaxial intensity distributions of the observed fluorescence with the majority of intensity propagating along the excitation axis in both the forward and backward directions. The detection of bulk vapor at significant stand-off distances is readily achieved. Molecules of differing vapor pressures, quantum yields of fluorescence, and fluorescence lifetimes were examined under adjustable experimental conditions. Excitation energy, laser fluence, analyte concentration, detection angle, and stand-off distance were among the factors studied in order to determine optimal parameters for ASE generation from aromatic hydrocarbon, ketone, nitrogen oxide, and nitroaromatic vapors.

Download or read book Detection of Atomic Hydrogen in a Hot filament Reactor written by Julie E. Evans and published by . This book was released on 1996 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book 205 Nm Probe Laser induced TALIF Detection in Hydrogen Flames Via SFG written by Bao Nguyen and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Detection of Excited States by Laser Induced Fluorescence written by H. Tischer and published by . This book was released on 1985 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laser absorption techniques have been developed for the measurement of densities of H2 (C 3 Pi sub u) metastable densities in H2 electrical discharges. Using this technique and a modulated discharge we have found that the metastable density is proportional to discharge current density for current densities up to 10 A/sq cm. By using a pulsed laser to destroy th metastables we have obtained preliminary measurements of the metastable lifetime as a function of H2 density. Keywords: hydrogen, electrons, radiation, excitation coefficient, fluorescence, excited states.

Download or read book Laser Induced Fluorescence Spectroscopy of OH in Flames written by Calvin Kwok-Yu Chan and published by . This book was released on 1979 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: