Photodetector device for detecting the front and rear ends of a

Details Photodetector device for detecting the front and rear ends of a Photodetector device for detecting the front and rear ends of a

1982-07-23

1983-11-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250223R, 250214B, G01N 2186

Patent

active

044171480

ABSTRACT:
A photodetector device for photoelectrically detecting the presence of a moving body, comprising an operational amplifier receiving as a first input an electric signal which is in proportion to variations in the quantity of light, and a delay circuit for delaying the electric signal by a predetermined period of time and applying the electric signal to the operational amplifier as a reference input with respect to the first input. The information of the presence of a moving body is obtained as an output from the operational amplifier.

REFERENCES:
patent: 3400270 (1968-09-01), Durig
patent: 3660670 (1972-05-01), Howard
patent: 3812372 (1974-05-01), Wirtz et al.
patent: 4047023 (1977-09-01), Key et al.
patent: 4120403 (1978-10-01), Stephanos

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