Basic working principle of laser dust particle counter
Date: 2016-08-19Read: 2
laser particle counterThe basic working principle isoptical sensorofDetecting laser passing through dust particlesAfter scattering, it is received by the photosensitive element and generates a pulse signal, which is thenOutput and amplify, then perform digital signal processing, compare with standard particle signals, and represent the comparison results with different parameters. Particles in the air scatter when exposed to light, a phenomenon known as light scattering. Light scattering is related to factors such as particle size, wavelength of light waves, refractive index of particles, and absorption characteristics of particles towards light. However, in terms of scattered light intensity and particle size, the intensity of particle scattered light increases with the increase of particle surface area. In this way, by measuring the intensity of scattered light, the size of the particles can be inferred, but the scattered light intensity generated by each particle is very weak and smallOptical pulseIt is necessary to convert light pulses into electrical pulses with larger signal amplitudes through the amplification effect of photoelectric converters, and then further amplify and distinguish them through electronic circuits to complete a large number of counting tasks. At this moment,electrical pulseThe quantity corresponds to the number of particles,electrical pulseThe amplitude corresponds to the size of the particles.