Dual sensor intruder alarm
US7126476B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 12, 2002 |
| Grant date | Oct 24, 2006 |
| Priority date | — |
| Expiry date | Dec 10, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/2494
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A dual sensor intruder alarm (DSIA) for detecting an intruder in a security zone monitored by the DSIA comprising: a PIR sensor; an additional sensor, and a controller that determines an operating difference between the ambient temperature and a normative surface temperature of an intruder in the security zone; wherein if the operating difference is equal to or greater than a predetermined threshold difference, the controller determines whether an intruder is present in the security zone using signals from both the PIR sensor and the additional sensor and if the operating difference is less than the predetermined threshold difference, the controller uses signals from the additional sensor but not from the PIR sensor to determine presence of an intruder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.