Non destructive testing and other applications using retroreflective illumination
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United States of America Patent
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Mar 13, 1990
Issued Date -
N/A
app pub date -
Dec 16, 1987
filing date -
Feb 14, 1984
priority date (Note) -
Expired
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Abstract
The invention concerns optical non-destructive test of materials using surface distortions detected by light which is reflected from the surface, retroreflected back to the surface and thence to form an image containing a greatly enhanced view of local deformation. In addition, the method is usable for determining surface characteristics of membranes and the like which can be influenced by sound and other wave energy from tested members and other sources and objects.
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