| 摘要 |
PROBLEM TO BE SOLVED: To provide an extinction type smoke sensor provided with a concrete means for avoiding the effect by contamination of a reflector, having a simple device structure, and further free from the effect by contamination of a light source. SOLUTION: This extinction type smoke sensor comprises a light emitting part 1, a beam splitter 3, a translucent reflector 5, a first light receiving part 7 for receiving the light transmitted by the translucent reflector 5, and a second light receiving part 9 for receiving the light reflected by the beam splitter 3 of the light reflected by the translucent reflector 5. The smoke concentration is calculated on the basis of the ratio of the light receiving quantity by the first light receiving part 7 to the light receiving quantity by the second light receiving part 9. COPYRIGHT: (C)2004,JPO
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