An angular displacement transducer
B. L. Welsh · Journal of Physics E Scientific Instruments · 1980
A miniature non-contacting displacement transducer i described, designed to measure the static and dynamic angular rotation of a shaft. The measurement techniques uses an infra-red light source, a specially constructed fibre-optic probe and a receiver. Amplitude measurements within a range of 0+or-180 degrees may be made for frequencies from 0 to 500 Hz. The transducer has continuous resolution, producing a voltage output related to instantaneous angular displacement.