Abstract
An optical non-contact probe to detect displacement, position and inclination of a work surface is presented. It uses two light beams which intersect near the surface and form spots of light on it. Images of the spots are formed on a photo-detector by a lens. Positions of the images and distance between them, which depend on the distance from the intersection to the surface, are sensed by the detector. Its output is electrically converted into a signal which represents displacement, position or inclination of the surface. An experimental probe is set up, in which laser diodes and a position-sensitive detector are used. The probe is tested on sandy, milled, lathe-turned, ground and specular surfaces and the measurements agree with predicted values.
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