PIR motion sensor

Details PIR motion sensor PIR motion sensor

2007-09-11

2009-08-25

Porta, David P (Department: 2884)

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

Reexamination Certificate

active

07579595

ABSTRACT:
A passive infrared sensor has two or more element arrays, each consisting of positive polarity and negative polarity elements. The signals from the arrays are both summed together and subtracted from each other, and if either the sum or difference signal exceeds a threshold, detection is indicated.

REFERENCES:
patent: 5461231 (1995-10-01), Sugimoto et al.
patent: 2005/0184869 (2005-08-01), Micko
patent: 2007/0040672 (2007-02-01), Chinigo

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