Photoelectrical sensor with multistaged, filtered amplifier circ

Details Photoelectrical sensor with multistaged, filtered amplifier circ Photoelectrical sensor with multistaged, filtered amplifier circ

1990-12-28

1992-05-12

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

330107, H01J 4014

Patent

active

051130688

ABSTRACT:
A photoelectrical sensor (10) provided with a multistaged, filtered amplifier circuit (16) for amplifying voltage pulses from a phototransducer (12) and a filtering I/V converter (14) includes three voltage amplifier stages (28, 30, 32) and three respectively associated band pass filters (34, 36 and 38) for cascade connecting the amplifier stages (28, 30, 32) between the phototransducer (12) and the detector circuit (18) and accumulating attenuation of response to signals at a frequency equal to the frequency of full wave rectified AC line voltage to maximize desensitization of the photoelectrical sensor (10) to AC powered ambient light fluctuations while broadening the pass band at the low frequency end for maximum response to the desired signal. A gain control circuit (40) is associated with the first stage amplifier (28), while a temperature compensation circuit (42) adjusts the gain of a second stage amplifier stage (30) to correct for temperature variations.

REFERENCES:
patent: 3970846 (1976-07-01), Schofield, Jr. et al.
patent: 4207466 (1980-06-01), Drage et al.
patent: 4381446 (1983-04-01), Fukuyama et al.
patent: 4485301 (1984-11-01), Gontowski, Jr. et al.
patent: 4591710 (1986-05-01), Komadina et al.
patent: 4749853 (1988-06-01), Salim
patent: 4939475 (1990-07-01), Prasse et al.

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