Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1990-08-28
1992-04-07
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250230, 250568, G01D 534, G06K 710
Patent
active
051030900
ABSTRACT:
An optical angle measuring apparatus for measuring the angular displacement of a polygon with light reflecting facets, for use, e.g., in machine tools. The apparatus comprises an autocollimator for projecting collimated light beams onto a facet of a polygon, a matrix array detector for detecting and transducing into angle measuring data the location of the focused light reflected from the polygon facets, a processor and angle error memory unit; for computing the difference between the angles of any given facet and an adjacent facet relative to a respective angle of an ideal regular polygon, and a control unit for processing and compensating for the said angle data to yield a corrected angle measurement. The corrected angle measurement is displayed on display means. A method for measuring the angular displacement of an object relative to a reference position employing the apparatus is also disclosed.
REFERENCES:
patent: 2871706 (1959-02-01), Fischer et al.
patent: 3283408 (1966-11-01), Rothe et al.
patent: 3639766 (1972-02-01), Ogden et al.
patent: 3802779 (1974-04-01), Fletcher et al.
patent: 4914291 (1990-04-01), Kan et al.
Dror Michael
Weiner Samuel
Bradley James E.
Messinger Michael
Nelms David C.
Optrocom Systems Ltd.
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