Strain gauge with resonant light modulator
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United States of America Patent
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-
Dec 3, 2002
Grant Date -
Aug 8, 2002
app pub date -
Dec 18, 2000
filing date -
Dec 18, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A strain gauge for measuring strain in a structural member, including: a light modulator adapted to be attached to the structural member, further including: a plurality of deformable elements, each of said deformable elements having a reflective surface and a resonant frequency that varies as a function of strain on the element; means for exerting a force to the deformable elements to cause them to deform at their resonant frequency between first and second operating states, an optical system for directing incident light onto the light modulator, and directing modulated light from the light modulator to a sensor that provides an output signal that varies as a function of the resonate frequency of said deformable elements; and means for generating a representation of the strain in the structural member from said output signal.
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