Development of an effusive inlet for mass spectrometric gas analysis of hypersonic boundary layerThe use of a microchannel plate (MCP) as a mass spectrometer inlet device to allow nonintrusive sampling of flight vehicle boundary layers is investigated. Two possible configurations for mounting the inlet are studied: (1) flow coaxial with the channels; and (2) flow perpendicular to the channel axis. The test gases are pure Kr; pure Ne; and a mixture of 10 pct Kr, 10 pct Ne, and 80 pct N2. The pressure ranges studied vary from 500 to 10 microns. A mass discrimination at the quadrupole mass spectrometer is observed, indicating an enrichment in the heavier gas. Possible explanations for this enrichment are discussed. It is shown that an MCP is capable of acting as a nonintrusive sampling device. Further work that will enable quantitative determination of the species at the surface is discussed.
Document ID
19880049266
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Brown, Kenneth G. (Old Dominion Univ. Norfolk, VA, United States)
Fishel, Charles E. (Old Dominion Univ. Norfolk, VA, United States)
Brown, David R. (Old Dominion University Norfolk, VA, United States)
Lewis, Beverley W. (Old Dominion Univ. Norfolk, VA, United States)
Wood, George M., Jr. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1987
Subject Category
Instrumentation And Photography
Meeting Information
Meeting: ICIASF ''87 - International Congress on Instrumentation in Aerospace Simulation Facilities