| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a smoke sensor which can maintain detection sensitivity constantly even if dirt is in a sensor assembly. <P>SOLUTION: A smoke sensor 100 comprises: a characteristics storage part 24 that variation characteristics indicating relations of an output variation based on output of an initial state of a photo detector 12 in a state without smoke and a sensitivity variation based on the sensitivity of the initial state of the photo detector 12 are stored; an output acquisition part 21 to acquire current output of the photo detector 12 in the state without smoke; an output variation calculation part 22 to calculate a variation of the current output of the photo detector 12 to the output of the photo detector 12 of the initial state; a sensitivity variation calculation part 23 to calculate a variation of sensitivity from the variation characteristics on the basis of the calculated variation of output; and a sensitivity correction part 26 to correct current sensitivity of the photo detector 12 on the basis of the calculated variation of sensitivity. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
