WILMSHURST, T.H., ROTHBERG, S. and HALLIWELL, N.A., 1991. Laser torquemeter - a new instrument. Electronics Letters, 27 (2), pp. 186 - 187.
A noncontact torquemeter is described whose operation relies on the periodicity of the dynamic laser speckle pattern backscattered from a rotating shaft. At 1800 RPM, some 100 time-resolved torque readings per cycle are possible to an accuracy of approximately 1' of shaft twist. In addition there is inbuilt immunity to shaft speed fluctuations and whole body vibrations.
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The work is supported by the Paul Instrument Fund of The Royal Society.