Optical method and apparatus for strain analysis
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United States of America Patent
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-
Sep 1, 1987
Grant Date -
N/A
app pub date -
Aug 19, 1985
filing date -
Aug 19, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus for measuring strains in a test object in any of a plurality of directions. The object is illuminated with coherent light so that light is reflected to a focussing lens and a shearing diffraction grating having lines extending in a plurality of directions. The various diffracted orders interfere at the focal plane of the lens and are recorded on a photographic media. The object is then stressed and a second exposure is made on the same media, resulting in interference between the fringes produced on the two exposures. The media is developed as a transparency and subjected to optical processing to detect strain in any direction.
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