Contactless relative movement sensor

Details Contactless relative movement sensor Contactless relative movement sensor

1983-08-04

1986-08-12

Rosenberger, R. A.

Optics: measuring and testing

By polarized light examination

With light attenuation

G01B 1114

Patent

active

046053085

ABSTRACT:
The sensor is particularly suitable to determine movement between a ground vehicle or aircraft over a ground surface, and a portion of the reference surface (10) is imaged on a grid plane (12, 30, 40) which, in accordance with the invention, is formed as a photo-sensitive transducer, for example a plurality of photo-sensitive diodes formed on a single chip and suitably connected in a grid or matrix pattern, made, for example, by a planar process by monolithic integration. Correlation-optical measurement of relative movement thus is simplified, and precise grid structures can be readily made, the output signals from the individual photo-sensitive junctions being summed and, if interdigited grid structures are used, the so summed signals can then be subtracted from each other to eliminate ambient light, or slowly varying low-frequency components and derive only a movement signal. By arranging two or more such grid structures at an angle with respect to each other, vectorial movement directions and, by using four interdigited grids with phase comparison, forward-reverse direction of movement can also be sensed. Summing can be effected by connection of individual photo junctions or by bundling light guide fibers arranged in a matrix of a grid pattern, and conducting the fibers to common electro-optical transducers.

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