Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1995-03-09
1996-12-17
Gonzalez, Frank
Optics: measuring and testing
By polarized light examination
With light attenuation
356375, 356376, 356385, 356386, 356387, G01B 1114
Patent
active
055859240
ABSTRACT:
A device for producing an electric signal which corresponds to the position of an object which is movable in translation or rotation relative to a base, wherein by optical scanning of markings which periodically recur upon a movement of the object, analog voltage signals A, A and B, B are produced by means of sensors which are spaced apart from each other by one-quarter of the scanning period. The signals are converted in an evaluation circuit with comparators into digital forms of the signals A and B (quadrature signal). In order to produce a test signal S, there is also provided in the device a summation circuit by means of which the voltage signals A, A and B, B are added and compared in a comparator with a threshold value.
REFERENCES:
patent: 4979827 (1990-12-01), Matsui
patent: 5237391 (1993-08-01), Huggins
patent: 5438416 (1995-08-01), Nater
Frey Harald
Gohring Frank
Schneider Erwin
Farber Martin A.
Gonzalez Frank
Ratliff Reginald A.
VDO Adolf Schindling AG
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