Accession Number:

AD0730541

Title:

Direct Measurement of Density Gradient in a Rarefied Flow,

Descriptive Note:

Corporate Author:

VON KARMAN INST FOR FLUID DYNAMICS RHODE-SAINT-GENESE (BELGIUM)

Personal Author(s):

• Eberius,H.
• Wendt,J. F.

Report Date:

1971-01-01

Pagination or Media Count:

7.0

Abstract:

The local density gradient in a rarefied flow was measured by oscillating an electron beam between two well-defined spatial limits and processing the resultant A. C. photomultiplier signal with a lock-in amplifier. The D. C. output was proportional to Delta rho is the fluorescence of the beam was linearly related to density. A theory is presented to demonstrate the limitations of the technique. Measurements in a free jet flow confirm its usefulness and demonstrate its inherently high sensitivity. Author

Descriptors:

• *MOLECULAR BEAMS
• DENSITY
• ELECTRON BEAMS
• FLUORESCENCE
• FLUID DYNAMICS
• FLUID FLOW
• BELGIUM

Subject Categories:

• Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE