Accession Number : ADA255045

Title :   Hypersonic Flow Diagnostic Development.

Descriptive Note : Final rept. 3 Mar 90-30 Sep 91,

Corporate Author : DEACON RESEARCH PALO ALTO CA

Personal Author(s) : O'Keefe, Anthony

Report Date : MAY 1992

Pagination or Media Count : 88

Abstract : We have developed and demonstrated in our labs two techniques which can be used for the non-intrusive sensing of air flows in a wide range of temperature and pressures. The single levels realized in the laser induced fluorescence sensing of molecular oxygen are approximately 5 to 7 times weaker than the predicted levels, due to errors in either the published absorption cross section, the published predissociation rates, or both. The reduced signal levels will increase the difficulty in system integration into the wind tunnel environment, but do not preclude it. The much greater signals realized using the Rayleigh scatter analysis of gas density have been demonstrated in our labs and have been shown to be ideal for this type of remote analysis. We have been able 7

Descriptors :   *ABSORPTION CROSS SECTIONS, *HYPERSONIC FLOW, *LASER INDUCED FLUORESCENCE, ABSORPTION, AIR, AIR FLOW, CROSS SECTIONS, DENSITY, ENVIRONMENTS, ERRORS, FACILITIES, FLOW, FLUORESCENCE, FREE STREAM, INTEGRATION, LASERS, MEASUREMENT, MODELS, OXYGEN, PRESSURE, RATES, SIGNALS, STATICS, STREAMS, TEMPERATURE, TEST AND EVALUATION, TUNNELS, WIND, WIND TUNNELS, WORK.

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE