Strain measurement method and device
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United States of America Patent
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Feb 10, 2009
Grant Date -
Mar 1, 2007
app pub date -
Aug 31, 2006
filing date -
Sep 1, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A non-contacting strain measurement method and system employs a laser light source for irradiating a test piece to provide a spectral pattern in spaced relationship from the test piece. The pattern is viewed while the test piece is placed under tension by a plurality of video cameras. The CCD video cameras are coupled to signal processing circuits which calculate the Poisson ratio according to the formula:
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