激光粒度測試結(jié)果影響因素分析
[Abstract]:In view of the fact that there are many brands and models of laser granulometer in the market at present, but the results of laser particle size measurement are quite different, the standard sample of spherical quartz powder developed by Tsinghua University is taken as the test sample, and the laser particle size meter from different manufacturers is used. The laser scattering method was used to compare the results of laser particle size measurement under different complex refractive index. It is found that the results of laser granulometer for the same sample are quite different from each other. Refractive index and absorptivity have great influence on particle size detection results, and the influence of refractive index is greater than that of absorptivity, but with the increase of absorptivity, the fluctuation of particle size detection result caused by the change of refractive index can be gradually counteracted. The test results tend to be stable. It is found that the smaller the residual value is, the smaller the deviation between the theoretical scattering light intensity and the actual measured light intensity is, and the more stable the detection result is, by searching for the variation law between the fitting residuals and the particle size detection results. However, it is found that there is no reliable basis for judging the refractive index of the sample according to the residual value of laser particle size testing users. By comparing the minimum residual values of different samples, it is found that the refractive index and absorptivity of the same sample are different in different particle size ranges. It is proved that the method of particle size measurement based on the fixed refractive index and absorptivity of each substance in the particle size detection industry is lack of practical basis.
【作者單位】: 太原理工大學礦業(yè)工程學院;北京海林節(jié)能科技股份有限公司;清華大學材料學院;淄博清大粉體材料工程有限公司;
【基金】:全國標準樣品技術(shù)委員會標準樣品研制項目(S2014125)
【分類號】:TB302
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