Abstract

An optical method is studied which permits one to measure the angular displacement using a pair of 2-D position sensitive detectors (PSD) and a microcomputer, even if the axis of rotation inclines. From the coordinates of two light spots imaged on the PSD, which are reflected with small double mirrors pasted on the object, the angular displacement and inclination are obtained. According to the experimental results and the spherical trigonometric estimation, it is possible to measure the angle in reciprocal movement of ~200 Hz, and to speed up the procedure tenfold.

© 1984 Optical Society of America

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