| 摘要 |
PROBLEM TO BE SOLVED: To provide a fine particle detection apparatus capable of precisely determining the amount of smaller-diameter particles of dust by means of a configuration that determines the amount of dust in the air having different-diameter particles on the basis of reflected light.SOLUTION: The fine particle detection apparatus includes: fine particle detection means 1 that outputs a detection pulse signal with a time width corresponding to the different-diameter particles of dust in the air on the basis of the strength of reflected light due to scattering of irradiation light; and determination means 2 that reads the detection signals and determines the amount of corresponding diameter particles of dust on the basis of the generation amount of signals per unit time. The determination means 2 is configured to determine the amount of smaller-diameter particles of dust on the basis of a difference between detection signals of smaller-diameter particles and detection signals of larger-diameter particles of neighboring particles in the read detection signals. When determining the amount of smaller-diameter particles of dust, since the influence by larger-diameter particles is reduced, the amount of smaller-diameter particles of dust can be precisely determined.SELECTED DRAWING: Figure 1 |
