Optical torque sensor utilizing change in reflectance grating line spacing
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United States of America Patent
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Feb 13, 1996
Issued Date -
N/A
app pub date -
Aug 27, 1993
filing date -
May 14, 1992
priority date (Note) -
Expired
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Abstract
Torque on a rotating or stationary shaft is measured by an apparatus that includes a light source for emitting light along a light path; a reflection grating fixed to the shaft along the light path reflecting and diffracting the light; and a light detector having a plurality of light detecting elements for receiving the reflected and diffracted light. Torque on the shaft produces a change in the grating spacing of the grating, which in turn produces a change of diffraction angle of the reflected light, thereby causing a different element of the light detector to receive the light.
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