Modern Optical Methods in Gas Dynamic Research: Proceedings of an International Symposium Held at Syracuse University, Syracuse, New York, May 25-26,

ISBN-13: 9781468419252 / Angielski / Miękka / 2013 / 295 str.

Darshan Dosanjh

Opis

This volume is based on material prepared by the contributors to the symposium on "Progress in Gas Dynamic Research by Optical Methods," held on May 25-26, 1970 in the Department of Mechanical and Aerospace Engineering at Syracuse University. The contents focus on experimental and analytical aspects of contemporary op- tical methods as applied in modern research on high speed and/or high temperature gaseous flows. State of the art, recent research results and possible research applications of spectroscopy, spectral interferometry, pulse laser holographic interferometry, laser as a diagnostic and plasma generating tool and the analysis of plasma by light scattering constitute part of the subject matter of this vol- ume. The emerging importance and impact of recent laser developments on optical diagnostics of gas dynamic and gas-physics phenomena is a recurring theme throughout the volume. Diverse applications of the shock tube to process gases to high temperature equilibrium conditions and the study of important char- acteristics of these radiating gases by contemporary spectroscopic methods are discussed in papers by Nicholls, Wurster and Wares, et al. Refractivity index measurements have long been extensively used for investigating gas dynamic and aerodynamic flows. However, the recent availability of the laser as a light source has brought sig- nificant improvements in the more conventional optical methods such as schlieren photography and interferometry as reported here in Alcock's paper. More recent laser developments have resulted in several com- pletely new optical diagnostic methods.

Spis treści

Recent Researches in Shock-Tube Spectroscopy.- Abstract.- Shock Tubes and the Spectroscopic Method.- Shock-Tube Spectroscopy of Astrophysically Important Diatomic Molecules.- Diagnostic Shock-Tube Spectra and the Kinetic Study of Collision Processes.- References.- Radiative Diagnostics Nonequilibrium Flows.- Nonequilibrium Emission Measurements.- Absorption Measurements in the Vacuum Ultraviolet.- Summary.- References.- Temperature Errors in Plasma Diagnostics and Their Possible Effects on Absolute Transition Probabilities.- Determination of Plasma Temperature from Relative gf-Values The AFCRL Shock Tube Absolute gf-Value.- Program Using Ultrasonics.- Errors in the Corliss and Bozman NBA Free-Burning ARC gf-Values.- Conclusion.- References.- Impurity Measurements in the Expansion Tube.- References.- Some Aspects of the Refractive Behavior of Gases.- Constitutive Properties and Wave Propagation in a Medium.- Lorentz Electron Theory of Dispersion.- The Dispersion Function.- Spectral Interferometry: The Hook Method.- Special Features.- References.- Interferometric Gas Diagnostics by the Hook Method.- The Experimental Setup.- Mach-Zehnder Interferometers.- Stigmatic Spectrographs, Detectors and Light Sources.- Theoretical Aspects of the Hook Method, Review of Experiments.- Summary.- References.- Hook Interferometry Using a Single Plate Interferometer.- References.- Some Optical Diagnostic Techniques Involving High Power Lasers.- Laser-Produced Plasma Studies in the Nanosecond Region.- Laser-Produced Plasma Studies with Subnanosecond Resolution.- Recent Developments.- References.- Pulse Laser Holographic Interferometry.- Principles of Holography.- Holographic Interferometry.- Cine-Interferometry.- The Analysis of Plasma by Light Scattering.- Elements of the Theory.- Experimental Procedures.- A Scattering Experiment.- References.- Laser — Generation of Rarefied Plasma Flows.- Abstract.- Apparatus.- Measurements on Laser-Produced Flows.- Study of Counter-Streaming Ionized Flows.- References.- A Summary of Recent Research on Continuous-Wave Chemical Lasers.- Four Basic Processes Influence CW Chemical Laser Operation.- Approach One: Laser Action Directly from Product Molecules in Fluid Mixing Chemical Lasers.- A Second Approach: Laser Action by Selective Energy Transfer from Produce Molecules in Fluid Mixing Chemical Lasers.- A Comparison of Approaches One and Two.- Total Population Inversion.- A Third Approach: A CW Explosion or Detonation Wave Chemical Laser.- Conclusion.- References.- Excitation of Gases Using Wavelength-Tunable Lasers.- Abstract.- Organic Dye Lasers.- Semiconductor Lasers.- Nonlinear Optical Techniques.- Resonant Interactions Between Lasers and Gases.- References.- Bibliography of Dye Laser Papers.- Production of Non-Equilibrium Atomic Populations Using Tunable Laser Excitation.- Notes.- Recent Studies of the Cs2/O2 Combustion Laser.- Abstract.- Transversely Sparked Laser.- CW Combustion Laser.- Summary and Conclusions.- References.