Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1992-01-07
1994-03-01
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
2503383, 250349, G08B 13191
Patent
active
052910202
ABSTRACT:
A dual pyroelectric-effect sensor having the sensing elements aligned in a motion plane permits direction determinations to be made for moving IR sources. Dual sensing-element PIR sensors provide different voltage outputs depending upon a relative direction of movement of an object and the sensing elements. By alternating the effective polarizations of the sensing elements in the PIR sensor, clear direction information is available from the PIR sensor. A direction detecting circuit working in cooperation with a switch controller employing a counter and a timer, permits independent tallying of entrances and exits. Upon the counter indicating that the number of objects that exited the area equals the number of objects that entered, the lights are immediately extinguished. The timer ensures that the lights turn off should incorrect values become recorded in the counter.
REFERENCES:
patent: 4704533 (1987-11-01), Rose et al.
patent: 4799243 (1989-01-01), Zepke
patent: 4914298 (1990-04-01), Quad et al.
patent: 4943800 (1990-07-01), Ikeda et al.
patent: 4963749 (1990-10-01), McMaster
Aronson Elliot B.
Hannaher Constantine
Intelectron Products Company
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