Accession Number : AD0689567

Title :   FEASIBILITY OF SLIP VELOCITY MEASUREMENT USING DOPPLER TECHNIQUE IN ARGON.

Descriptive Note : Scientific rept.,

Corporate Author : UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF AEROSPACE ENGINEERING

Personal Author(s) : Sloat,Timothy Norman ; Scott,Paul B.

Report Date : DEC 1968

Pagination or Media Count : 71

Abstract : The feasibility of measuring slip velocities by observing the Doppler shift in electron beam excited radiation is investigated. The expected Doppler shift in the 4277 A line of argon gas is 0.00276 A. Line broadening effects are dominated by Doppler broadening, which at flow conditions near the leading edge, results in a half-intensity width of 0.00146 A. Using a Fabry-Perot interferometer, the line shift and Doppler profiles are readily resolved near the leading edge. A few suggestions are made for increasing the signal level, including crossing the electron beam with an argon ion laser beam. (Author)

Descriptors :   (*NOZZLE GAS FLOW, RAREFIED GAS DYNAMICS), PITOT TUBES, DOPPLER EFFECT, ARGON, ELECTRON BEAMS, BOUNDARY LAYER

Subject Categories : Aerodynamics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE