Calculation and analysis of refractive index of laser particle size analyzer

Mie theory (MIE) is a theory that calculates the scattering intensity by considering the absorption of light by substances and various electromagnetic effects. Therefore, the refractive index is an indispensable parameter for Mie calculation. Usually in the software design, several models with different refractive indexes are calculated to be suitable for particles of different substances. Therefore, the refractive index is generated before the test, not the result of particle size measurement.

Therefore, to use a particle size analyzer to test, you first need to determine the refractive index of the sample. The average user does not know the exact parameters of the refractive index of the product to be measured. It only shows the refractive index of the substance, not the refractive index of the powder, there is a big difference between the two), so you have to choose one randomly for the calculation, and if the calculation is not satisfactory, then change the other. How accurate is such a refractive index, is it not doubtful?

In fact, the research results show that the accuracy of particle size measurement is not only related to the refractive index, but also related to the particle shape, particle surface state, and particle concentration. The influence of the latter two is not less than that of the former. For this reason, Micron Instruments not only prepares 16 models with different refractive indexes, but also provides special software for the comprehensive calibration of particle size. In order to be responsible to the user and not cause illusion to the user, Weina did not indicate the refractive index in the test report, because the refractive index does not accurately represent the characteristics of the sample. It is just a model code used in the calculation.

Some people say: The absence of refractive index in the test report is not Mie theory, this statement is not comprehensive. Some instruments use the Fraunhofer diffraction theory (such as the New Partec company in Germany), of course, no refractive index is required. Although some instrument companies use Mie theory, they are unwilling to indicate the refractive index due to the consideration of the user. Obviously Weina belongs to the latter.

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