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A laser particle counter with light scattering method works by using a laser beam to illuminate particles in a sample, and then measuring the scattered light to determine the size and number of particles present. The scattered light is collected by a detector, which then sends the signal to a computer for analysis.

The amount of light scattered by a particle is directly proportional to its size, so the larger the particle, the more light it will scatter. By analyzing the scattered light, the particle counter can determine the size distribution of the particles in the sample.

Additionally, the scattered light can be directed into different detectors for counting the number of particles in the sample. This method is widely used for measuring particle size and concentration in liquids, gases, and aerosols.