PIR motion sensor system
US8314390B2 · kind B2 · utility
16Cited by
19References
22Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 30, 2009 |
| Grant date | Nov 20, 2012 |
| Priority date | — |
| Expiry date | Sep 20, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B29/188
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A passive infrared sensor has two or more detector 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.