| 摘要 |
PROBLEM TO BE SOLVED: To provide a floating fine particle sensing device and a smoke sensor which can discriminate floating fine particles from foreign substances which are not floating fine particles and sense them respectively.SOLUTION: A floating fine particle sensing device is provided with: a chamber 10 for receiving flow-in of floating fine particles from outside and blocking disturbance light from outside; a pair of first light receiving and emitting parts (11, 12) which are placed in the chamber 10 and sense floating fine particles flown in the chamber 10; and second light receiving and emitting parts (21, 22) which are placed in the chamber 10 and sense foreign substances different from floating fine particles in a second sensing region on the bottom side to a first sensing region where the floating fine particles are sensed by the first light receiving and emitting parts (11, 12). |
