Fire or smoke detector with high false alarm rejection performance
US7760102B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 23, 2006 |
| Grant date | Jul 20, 2010 |
| Priority date | — |
| Expiry date | Feb 28, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B17/113
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An apparatus for detecting a hazardous condition includes an optical module for measuring scattered light caused by the hazardous condition, a temperature sensor, a humidity sensor, and a processing unit coupled to receive signals from the optical module, the temperature sensor and the humidity sensor. The processing unit processes the signals to determine criteria to distinguish deceptive phenomena from a hazardous condition in order to limit false alarms. The processing unit uses the criteria for adjusting an alarm threshold value that is a function of a reference function, a function based on temperature criteria, a function based on at least one of the temperature criteria and a ratio criterion, and a function based on humidity criteria.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.