Method and apparatus for speckle-shearing interferometric deformation analysis
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United States of America Patent
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Jul 28, 1987
Issued Date -
N/A
app pub date -
Aug 30, 1985
filing date -
Aug 13, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A nondestructive means of testing tires for subsurface defects by speckle-shearing interferometry. The tire is illuminated with a beam of coherent light. The light reflected from a surface of the tire is directed through a converging lens having one-half of one of its surfaces covered by a transparent plate having flat parallel sides such that a photographic media is exposed to a first pair of focused images of the tire displaced with respect to one another. The tire is then subjected to a stress, and a second pair of slightly displaced images is recorded on the same photographic media. The photographic media is developed to form a transparency, and then a first surface of the developed photographic media is illuminated with a collimated white light source. Interference fringes that are observed by viewing the opposite surface of the photographic media may then be analyzed.
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