| 摘要 |
PCT No. PCT/AU97/00270 Sec. 371 Date Oct. 28, 1998 Sec. 102(e) Date Oct. 28, 1998 PCT Filed May 6, 1997 PCT Pub. No. WO97/42487 PCT Pub. Date Nov. 13, 1997A method and system for monitoring integrity of a filter (25) of a smoke or fire detector system. The system has a detector chamber (14) into which light is passed from a light source incorporated into a light source control circuit (10). Scattered light is detected by a light scatter detector (12). Controller circuit (16) receives signal from the detector (12) and makes a cumulative count over time of the number of dust particles detected.
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