Detectors
US8681012B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 2010 |
| Grant date | Mar 25, 2014 |
| Priority date | — |
| Expiry date | Sep 30, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B29/145
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A detector (101) for detecting smoke from a fire and generating an alarm has a detection chamber (105) in which a light source (111) and a light detector (113) are arranged. In normal use, the light detector (113) only receives light from the light source that has been scattered by the presence of smoke in the chamber (105). When testing the detector (101), the light detector (113) receives light from the light source (111) by presenting a reflecting surface (129a) of a rotor member (129) to reflect light from the light source (111) towards the light detector (113). In normal use, the rotor member (129) is positioned so that the reflecting surface (129a) no longer reflects light from the light source (111) towards the light detector (113).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.