| 摘要 |
The smoke detector has a fixing socket in which a detector insert with an optical module is fitted. The module has a light source (6) and a photodetector (7) contained within a measuring chamber having a base (11). The module further has a central light stop (10) and a labyrinth system provided by plates (9) projecting inwards from the periphery of the measuring chamber. The plates reflect the light which is beamed from the source. The peripheral plates are arranged so that the incidence angle of the reflected light, before the photodetector receives it, is constant. Selection is based on reflection from the maximum number of peripheral plates. |
