Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
February 10, 2009
Patent Application Number
11513934
Date Filed
August 31, 2006
Patent Primary Examiner
Patent 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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