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Dual-beam skin friction interferometerA portable dual-laser beam interferometer is described that nonintrusively measures skin friction by monitoring the thickness change of an oil film at two locations while said oil film is subjected to shear stress. An interferometer flat is utilized to develop the two beams. Light detectors sense the beam reflections from the oil film and the surface thereunder. The signals from the detectors are recorded so that the number of interference fringes produced over a given time span may be counted.
Document ID
19830013678
Acquisition Source
Legacy CDMS
Document Type
Other - Patent
Authors
Monson, D. J. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
September 4, 2013
Publication Date
July 10, 1981
Subject Category
Optics
Report/Patent Number
Patent Number: NASA-CASE-ARC-11354-1
Patent Application Number: US-PATENT-APPL-SN-282192
Patent Number: US-PATENT-4,377,343
Accession Number
83N21949
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
NASA-CASE-ARC-11354-1|US-PATENT-4,377,343
Patent Application
US-PATENT-APPL-SN-282192

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