Interferometric torque and power sensor
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United States of America Patent
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Jul 1, 2003
Grant Date -
N/A
app pub date -
Jul 28, 1999
filing date -
Jul 28, 1999
priority date (Note) -
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Abstract
An interferometric optical torque sensor senses the torque transmitted by a rotating shaft without requiring physical contact with the shaft. A diffraction grating is provided on the shaft with its grating lines parallel to the longitudinal dimension of the shaft. A laser beam is split in two and reflected from two axially-separated points of the grating. As the shaft twists, the phase of the light in the diffracted orders of the light reflected from the grating changes. By superimposing the diffracted beams an interference pattern is created. The motion of the interference fringes in this pattern is proportional to the twist, therefore the torque, in the shaft. The power transmitted by the shaft may be computed from the torque and shaft speed.
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