| 摘要 |
PROBLEM TO BE SOLVED: To provide a smoke sensor wherein an error is reduced by allowing sensitivity to smoothly change before and after switching of an amplifier.SOLUTION: This smoke sensor includes: an LD unit 21; a photodiode 22; an amplifier circuit 24 amplifying an output signal of the photodiode 22; and an MPU 10 distinguishing fire occurrence based on an output of the amplifier circuit 24 and a smoke density obtained based thereon. The amplifier circuit 24 includes a plurality of stages of amplifiers connected in series, and outputs an output of each amplifier to a control circuit. The MPU 10 corrects the output of each amplifier based on a correction value obtained based on the output of the amplifier and the output of the amplifier adjacent to the preceding stage side thereof. |
