Photoelectric digital measuring instrument balancing circuit

Details Photoelectric digital measuring instrument balancing circuit Photoelectric digital measuring instrument balancing circuit

1980-10-27

1983-01-18

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

362 20, 315 88, F21V 1904, H05B 3910

Patent

active

043693660

ABSTRACT:
A balancing circuit for a digital, photoelectric length or angle measuring system which includes a measuring scale, first and second light sources for illuminating the scale, and photosensitive scanning elements for measuring light modulated by the scale. The disclosed balancing circuit includes a separate balancing branch for each of the light sources. Each balancing branch is separately adjustable, and each balancing branch serves to provide an equal light signal use to compensate for the average intensity of the respective light source. Preferably, only one of the two light sources is activated at any given time, and the two balancing branches are arranged so that the balancing branch associated with the activated light source is not adversely influenced by the balancing branch associated with the non-activated light source. In this way, two or more separate, independently calibrated, balancing branches are provided to facilitate switching from one light source to another without requiring re-balancing of the measuring instrument.

REFERENCES:
patent: 2557531 (1951-06-01), Blanchet
patent: 3577173 (1971-05-01), Blomgren
patent: 3678286 (1972-07-01), Willis
patent: 4061911 (1977-12-01), Krasin
patent: 4078173 (1978-03-01), Fultz

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