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Record Details

Record 27 of 18916
Air-mass flux measurement system using Doppler-shifted filtered Rayleigh scattering
Author and Affiliation:
Shirley, John A.(NASA Lewis Research Center, Cleveland, OH, United States)
Winter, Michael(United Technologies Research Center, East Hartford, CT, United States)
Abstract: An optical system has been investigated to measure mass flux distributions in the inlet of a high speed air-breathing propulsion system. Rayleigh scattered light from air is proportional to the number density of molecules and hence can be used to ascertain the gas density in a calibrated system. Velocity field measurements are achieved by spectrally filtering the elastically-scattered Doppler-shifted light with an absorbing molecular filter. A novel anamorphic optical collection system is used which allows optical rays from different scattering angles, that have different Doppler shifts, to be recorded separately. This is shown to obviate the need to tune the laser through the absorption to determine velocities, while retaining the ability to make spatially-resolved measurements along a line. By properly selecting the laser tuning and filter parameters, simultaneous density measurements can be made. These properties are discussed in the paper and experiments demonstrating the velocimetry capability are described.
Publication Date: Jan 01, 1993
Document ID:
19930039263
(Acquired Dec 28, 1995)
Accession Number: 93A23260
Subject Category: INSTRUMENTATION AND PHOTOGRAPHY
Report/Patent Number: AIAA PAPER 93-0513
Document Type: Preprint
Publication Information: 10 p.
Publisher Information: United States
Meeting Information: AIAA, Aerospace Sciences Meeting and Exhibit; 31st; Jan. 11-14, 1993; Reno, NV; United States
Meeting Sponsor: AIAA
Financial Sponsor: NASA; United States
Organization Source: NASA Lewis Research Center; Cleveland, OH, United States
Description: 10p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: AIR BREATHING ENGINES; ENGINE MONITORING INSTRUMENTS; MASS FLOW; RAYLEIGH SCATTERING; DOPPLER EFFECT; FLOW VELOCITY; LASER APPLICATIONS
Imprint And Other Notes: AIAA, Aerospace Sciences Meeting and Exhibit, 31st, Reno, NV, Jan. 11-14, 1993
Miscellaneous Notes: Research supported by NASA
Availability Source: Other Sources
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