Method and device real time non-destructive determination of residual stresses in objects by the optical holographic interferometry technique
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United States of America Patent
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Sep 30, 2003
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N/A
app pub date -
Jun 5, 2000
filing date -
Oct 29, 1999
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Expired
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Abstract
This invention relates to a method and device for non-destructive testing of details, machine units and mechanisms, various materials, and in particular, to a method and device for non-destructive determination of residual stresses which are based on the optical holographic interferometry technique. First, a hologram of the investigation area of the object in its initial state is registered. Then the release of the residual stresses in an investigation point in the investigation area is performed by exposing the surface of the object to a high-current electric pulse with rectangular shape. Finally, an interferogram of the exact same area of the object is made, and the residual stresses at the investigation area are determined from the shape and size of the fringes in the interferogram.
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