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Holographic thin film analyzerA system for the analysis and measurement of thin films in which the light output of a laser is split into two beams is discribed. The first beam is focused to illuminate the entire area of a photographic plate and the second beam is colummated and directed through a relatively small portion of the photographic plate onto the sample with the film to be observed. The surface of the sample is positioned at a slight angle with respect to a plane normal to the second beam and the light reflected from the sample arrives back at the photographic plate in a region other than through which the second beam originally passes. By making two successive exposures during the deposition of material on the surface of the sample, holograms are recorded on the photographic plate. The plate is then developed and interference lines of the hologram provide a measurement of the film or material deposited between exposure.
Document ID
19730021744
Acquisition Source
Legacy CDMS
Document Type
Other - Patent
Authors
Williams, J. R.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Norden, B. N.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
September 2, 2013
Publication Date
July 10, 1973
Subject Category
Masers
Accession Number
73N30476
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-PATENT-3,744,912|NASA-CASE-MFS-20823-1
Patent Application
US-PATENT-APPL-SN-175981
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