Optical smoke detector operating in accordance with the extinction principle and method for compensating its temperature drift
US6456379B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 14, 1999 |
| Grant date | Sep 24, 2002 |
| Priority date | — |
| Expiry date | Sep 14, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B17/113
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A detector device for detecting the presence of airborne particles such as smoke includes a light source, an optical bridge, a measurement path, a reference path, a measurement receiver and a reference receiver. The optical bridge, in addition to the light source and the measurement and reference receivers, are the only optical elements of the detector device. The optical bridge includes two circular apertures arranged downstream of the light source along the radiation path. The light source is arranged in a chamber having an air reservoir, whose surface area is substantially greater than that of the light source. A temperature drift curve is determined by heating the light source and storing the detector signal at different temperatures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.