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Making Displaced Holograms At Two WavelengthsTwo-wavelength holographic system augmented with pair of prisms to introduce small separation between holograms formed simultaneously at two wavelengths on holographic plate. Principal use in study of flows. Gradients in index of refraction of fluid caused by variations in temperature, concentration, or both. Holography at one wavelength cannot be used to distinguish between two types of variations. Difference between spacings of fringes in photographs reconstructed from holograms taken simultaneously at two different wavelengths manipulated mathematically to determine type of variation.
Document ID
Document Type
Other - NASA Tech Brief
Witherow, William K.
(NASA Marshall Space Flight Center, Huntsville, AL.)
Ecker, Andreas
(NASA Marshall Space Flight Center, Huntsville, AL.)
Date Acquired
August 14, 2013
Publication Date
April 1, 1989
Publication Information
Publication: NASA Tech Briefs
Volume: 13
Issue: 4
ISSN: 0145-319X
Subject Category
Physical Sciences
Report/Patent Number
Accession Number
Distribution Limits
Work of the US Gov. Public Use Permitted.

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