Particle detection sensor, dust sensor, smoke detector, air conditioner, and particle detection method

摘要

The detectable particle size range can be widened. A particle detection sensor (1) receives light scattered from a light projecting element (111) that projects light onto a detection area (DA) and light projection element (111) by particles (2) that pass through the detection area (DA). And a light receiving element 121 that generates an electric signal including a pulsed waveform corresponding to the particle 2. The particle detection sensor 1 also includes a signal processing unit 20 that amplifies an electrical signal and detects the particle 2 using the amplified electrical signal. When the fluid flow in the detection area DA is the first speed v1, the signal processing unit 20 amplifies the electrical signal with the first amplification factor G1, and the fluid flow has a second speed v2 different from the first speed v1. In this case, the electric signal is amplified at a second amplification factor G2 different from the first amplification factor G1. [Selection] Figure 9