PIR motion sensor utilizing sum and difference sensor signals

Details PIR motion sensor utilizing sum and difference sensor signals PIR motion sensor utilizing sum and difference sensor signals

2007-02-27

2007-02-27

Hofsass, Jeffery (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S541000, C340S545200, C250S342000, C250S349000

Reexamination Certificate

active

11097904

ABSTRACT:
A passive infrared sensor has two detector elements, each of which has a positive part and a negative part, with each detector element generating respective first and second signals. The signals are added together to render a “sum” signal and are also subtracted one from the other to render a “difference” signal, and a moving object is indicated only when the “sum” signal has a frequency different than the frequency of the “difference” signal.

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