PARTICLE DETECTION DEVICE

摘要

A particle detection device includes a scattered light detector detecting an intensity of light scattered by a particle irradiated with a laser, an incandescent light detector detecting an intensity of incandescent light from the particle being irradiated with the laser, and a signal processor including: a first peak hold circuit holding a peak in the intensity of the light scattered by the particle; a second peak hold circuit holding a peak in the intensity of the incandescent light from the particle; and a threshold value comparison circuit comparing the peak in the first peak hold circuit to a threshold and, when the peak in the first peak hold circuit exceeds the threshold, outputs a reset signal to the second peak hold circuit immediately thereafter so the peak previously in the second peak hold circuit is reset immediately after the peak in the first peak hold circuit exceeds the threshold.

主权项

1. A particle detection device, comprising:
a scattered light detector that detects an intensity of light scattered by a particle as a result of being irradiated with a laser beam; an incandescent light detector that detects an intensity of incandescent light generated by said particle as a result of being irradiated with said laser beam; and a signal processing part that includes:
a first peak hold circuit that holds a peak value in the intensity of the light scattered by said particle detected by the scattered light detector;a second peak hold circuit that holds a peak value in the intensity of the incandescent light generated by said particle detected by the incandescent light detector; anda threshold value comparison circuit that compares the peak value held by the first peak hold circuit to a prescribed threshold value and, when the peak value held by the first peak hold circuit exceeds the prescribed threshold value, outputs a reset signal to the second peak hold circuit immediately thereafter so that the peak value previously held by the second peak hold circuit is reset immediately after the peak value held by the first peak hold circuit exceeds the prescribed threshold value.