Photoelectric instrument for observing a viewing corrider of int

Details Photoelectric instrument for observing a viewing corrider of int Photoelectric instrument for observing a viewing corrider of int

1982-05-03

1985-02-05

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340555, G01V 904, G08B 1318

Patent

active

044980027

ABSTRACT:
A photoelectric instrument detects dissimilar variations in a viewing corridor and provides an alarm signal responsive to such changes. A lens, such as a camera lens, is mounted on a case and separate photoelectric sensors are adjustably positioned in the focal plane of the lens within the case. The photoelectric sensors are moved relative to each other to define a viewing corridor of interest. The photoelectric sensors are coupled to a differential amplification network and the inputs to the amplification network are adjusted to produce a reference signal. Deviations of the differential amplification network output from the reference signal indicate an intrusion or non-uniform alteration of the field of view, which results in an alarm signal.

REFERENCES:
patent: 3309689 (1967-03-01), Keeney
patent: 3718822 (1973-02-01), Pascue
patent: 3789384 (1974-01-01), Akers
patent: 3932746 (1976-01-01), Swanson
Field Disturbance Sensing Unit, vol. 18, No. 7, pp. 2275-2276, 12/1975, IBM Tech. Disclosure Bulletin, K. E. Powell.

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