Light detector and signal processing circuit

Details Light detector and signal processing circuit Light detector and signal processing circuit

1987-07-22

1988-07-05

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

324 96, 356368, 250206, 250225, G01R 3100, G01J 400

Patent

active

047556650

ABSTRACT:
A light detector measures the intensity of two different light beams, computes a ratio of an AC to a DC component for each light beam, and computes a quotient by dividing a first of the above ratios by a second of the above ratios. A light detector has a first photodetector, means, responsive to the first photodetector, for computing a first ratio of an AC component to a DC component of the intensity of a first light detected by the first photodetector, means for producing a first average value of the first ratio, a second photodetector, means, responsive to the second photodetector, for computing a second ratio of an AC component to a DC component of the intensity of the second light detected by the second photodetector, means for producing a second average value of the second ratio, and means for computing a quotient by dividing the first average value of the first ratio by the second average value of the second ratio.

REFERENCES:
patent: 3930733 (1976-01-01), Holly
patent: 4329054 (1982-05-01), Bachalo
patent: 4539521 (1985-09-01), Matsumoto
patent: 4547729 (1985-10-01), Adolfsson et al.
patent: 4581579 (1986-04-01), Nagatsuma et al.
patent: 4584470 (1986-04-01), Iizuka et al.
patent: 4724393 (1988-02-01), Kumada et al.
patent: 4730931 (1988-03-01), Watson

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