Dust Particle Counter / Laser Dust Particle Counter Selection Guide
[Basic principle of dust particle counter]
Particles in the air scatter under the illumination of light. This phenomenon is called light scattering. Light scattering is related to particle size, wavelength of light waves, refractive index of particles, and absorption characteristics of light by particles. However, in terms of scattered light intensity and particle size, there is a basic rule that the intensity of the scattered light of the particles increases as the surface area of ​​the particles increases. Thus, as long as the intensity of the scattered light is measured, the size of the particle can be inferred, which is the basic principle of the light scattering particle counter.
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[Dust Particle Counter Main Parts]
The light source is a key component of the dust particle counter and has a large impact on the performance of the instrument. The light source requires high stability, long life and no interference. The source of the laser dust particle counter has two kinds of common light sources and laser light sources. The common light source is an iodine-tungsten lamp, which has a large volume, high heat generation and short life, and needs to be preheated after starting up. The laser light source is a laser, which has small volume, high stability and long service life. It is often integrated with the detection chamber and the photodetector to form a sensor. Common laser sources are HeNe lasers and laser diodes. The laser dust particle counter using a common light source has a low response to a particle signal of 0.3 μm or less, and its signal amplitude is almost the same as the noise amplitude of the counter itself, and the signal is difficult to detect from the noise. Such instruments, although labeled with a channel of 0.3 [mu]m, are only suitable for the determination of particles larger than 0.3 [mu]m, especially above 0.5 [mu]m. Due to the good monochromaticity of the laser and the stable and stable light energy, the laser dust particle counter using the laser source has a high signal-to-noise ratio (SNR). Some of these instruments can detect 0.1 μm particles.
[Dust particle counter classification]
1, according to the test principle: light scattered method test (white light, laser), microscopy test, weighing method test, DMA test (particle size analyzer), inertial test, diffusion test, condensation test (CNC) Wait.
2, according to the flow rate: small flow rate 0.1cfm (2.83L / min) large flow rate 1cfm (28.3L / min), the current GMP new regulations also have 50L / min flow of the instrument;
3, by shape, size: hand-held, desktop
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