Optical torque sensor

Details Optical torque sensor Optical torque sensor

1994-08-11

1996-07-02

Chilcot, Richard

Measuring and testing

Dynamometers

Responsive to torque

73862334, G01F 100

Patent

active

055311270

ABSTRACT:
An improved torque sensor, or relative angular movement sensor, comprises an input member, an output member, LED light sources, a pair of photodetector units adapted to receive light from the LED light sources, and a signal processor, in which said signal processor is adapted to receive output signals from the photodetector units, the output signals of the photodetector units being dependent upon the light signals which they receive, and the signal processor being adapted to process the output signals from the photodetector units so as to produce a modified output signal indicative of the relative angular displacement between, or torque applied between, the input and output member, wherein the improvement lies in the arrangement of photodetectors which comprise the photodetector units. The photodetectors are arranged in such a way that any phase shift which may exist between the signals from the two photodetector units is cancelled out when the modified torque output signal is produced, in order to remove any `ripple` in this signal.

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