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201-19 What is the difference between the measurement result of the fisher sub sieve sizer and the laser particle size meter and how to compare them?

201-19 What is the difference between the measurement result of the fisher sub sieve sizer and the laser particle size meter and how to compare them?

Fisher sub sieve sizer and laser particle size meter are widely used in the field of powder. Both measurement results can be expressed in microns. But the two results cannot be compared. The reason is that they work in different principles. For instrument with different working principles, there is no comparability, just like the differences before the unification of weights and measures. The average particle size meter works according to the principle of air transmission method. In essence, what it measures is not the particle itself, but the particle gap. But this kind of clearance is also determined by the size of particles, large particles, large clearance, air through more, small particles, small clearance, air through less. The working principle of laser particle size meter is the scattering phenomenon of laser particles. Large particles, small scattering angle, small particles, large scattering angle. This scattering signal is collected by detectors at different positions, so as to obtain the particle size distribution. The particle shape has a great influence on the accuracy of both measurements. The average particle size meter requires that each particle is roughly round and close to the same circle. The laser particle size meter adopts the equivalent diameter, that is, it assumes that the particle is round, but the more irregular the particle shape is, the more inaccurate the measurement results will be. As for the application scope of the two, in some specific fields, such as magnetic materials, hard alloy, powder metallurgy, pharmacy, etc., the average particle size meter is still very useful in the industry.

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