Hand held phase-shifting diffraction moire interferometer
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United States of America Patent
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Sep 20, 1994
Issued Date -
N/A
app pub date -
Mar 18, 1993
filing date -
Sep 20, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An interferometer in which a coherent beam of light is generated within a remote case and transmitted to a hand held unit tethered to said remote case, said hand held unit having optical elements for directing a pair of mutually coherent collimated laser beams at a diffraction grating. Data from the secondary or diffracted beams are then transmitted to a separate video and data acquisition system for recording and analysis for load induced deformation or for identification purposes. Means are also provided for shifting the phase of one incident beam relative to the other incident beam and being controlled from within said remote case.
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