Intrusion detection system and a method therefor
US4882567A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 29, 1988 |
| Grant date | Nov 21, 1989 |
| Priority date | — |
| Expiry date | Sep 29, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/2494
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A dual sensing intrusion detection system includes a passive infrared radiation detection sensor that generates a first output signal in response to the detection of an intruder in the volume of space. A second detection sensor is directed to the same volume of space and generates a second output signal in response to detection of the intruder. A switch activates the second detection sensor in response to the detection of the intruder by the infrared radiation detector. Logic circuit receives the first and second output signals and produces an alarm signal in response thereto to indicate the detection of the presence of the intruder in the volume of space.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.