| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a particle detector which detects smoke in spatial area without sampling. <P>SOLUTION: The disclosed smoke detector (10) uses luminous flux such as laser (16) to monitor such an area as a room (12). Further it uses a camera (14) to take partial images of the room (12) (including light path of laser beam). Particles in scattered light (30) will scatter the light (30), which is photographed with the camera (14) for analysis. A processor (20) extracts data associated with the scattered light (30) to determine level of the smoke in that area. Images taken without laser are used as a reference point, and also be compared with images taken with laser-on to assist in determining level of the scattered light (30) to ambient light. Filters (24, 26) are used to reduce signals generated from background light. <P>COPYRIGHT: (C)2011,JPO&INPIT |
