summary
The laser particle size analyzer based on Mie scattering principle is one of the widely used instruments in the field of particle measurement. Normally, the smaller the particle size, the larger the scattering angle, and the more outward the main peak position of the scattered light energy distribution received by the laser particle size analyzer detector array. However, for particles with a specific relative refractive index, in certain particle size ranges, the main peak position of the scattered light energy distribution will vary with the particle sizeThe abnormal movement of scattered light energy distribution occurs when the diameter decreases and moves towards the inner side of the detector array. According to the Mie scattering principle,The law of abnormal movement and the particle size range of abnormal movement under different relative refractive indices were given, and the effect of abnormal movement on particle size was analyzedAnalyzed the impact, proposed methods to reduce the impact, and tested and compared actual samples. The results indicate that this method canTo reduce the impact of abnormal movement on granularity analysis.

Keywords laser particle size analyzer; Abnormal movement of light energy distribution; Mie scattering; Main peak position