Multi-sensor doubled row direction sensitive counting and switch

Details Multi-sensor doubled row direction sensitive counting and switch Multi-sensor doubled row direction sensitive counting and switch

1992-10-14

1994-05-17

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250342, 340567, G01V 904

Patent

active

053130600

ABSTRACT:
A direction sensitive counting and switching device has an optical system which includes a convex lens and a passive infrared detector composed of sensor elements arranged in at least one double row. The detector is disposed on one side of the convex lens for detecting radiation transmitted along a beam path from persons or objects moving through a detection area of the detector located on the other side of the convex lens and producing output signals in response to the detected radiation. A preamplifier is coupled to the detector for producing amplified output signals from the output signals. An evaluation circuit is coupled to the preamplifier for processing the amplified output signals of the sensor elements and, if the amplified output signals permit a conclusion as to directional movement of a person or object in the detection area of the detector, initiates a counting or a switching process which contains information about direction of movement of the respective person or object in the detection area.

REFERENCES:
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patent: 4912748 (1990-03-01), Horii et al.
patent: 5012099 (1991-04-01), Paturel et al.
patent: 5045702 (1991-09-01), Mulleer
P. N. J. Dennis et al, "Recent Advances in Infrared Surveillance Systems", Conference Proceedings Military Microwaves 88, Jul. 5, 1988, London, pp. 93-98.

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