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Remote optical techniques for liquid flow and temperature measurement for Spacelab experimentsThree nonintrusive measurement techniques for Spacelab experiments are investigated. In the photochromic dye technique, a small amount of dye is dissolved in a low viscosity silicone oil and dye streaks are produced upon exposure to a UV source; the movement of the streaks reveals the flow. A laser Doppler dual-scatter system is being developed for low flow speed measurement; an accuracy of a few percent has been demonstrated for flows of a few millimeters per second. A double-grid schlieren system is being developed for temperature measurement; the optical arrangement is such that an image of a Ronchi ruling is superposed on the original ruling, giving a uniform gray field of view.
Document ID
19790051394
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Fowlis, W. W.
(NASA Marshall Space Flight Center Fluid Dynamics Laboratory, Huntsville, Ala., United States)
Date Acquired
August 9, 2013
Publication Date
June 1, 1979
Publication Information
Publication: Optical Engineering
Volume: 18
Subject Category
Astronautics (General)
Accession Number
79A35407
Funding Number(s)
CONTRACT_GRANT: NAS8-31746
Distribution Limits
Public
Copyright
Other

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