激光粒度测试结果影响因素分析

发布时间：2018-10-15 16:59

【摘要】：针对目前市面上激光粒度仪品牌、型号众多,但激光粒度测试结果差异较大的现象,以清华大学研制的球形石英粉标准样品为测试样品,使用不同厂家的激光粒度仪,通过激光散射法,对比不同复折射率下的检测结果,探究激光粒度测试结果的影响因素。研究发现,针对同种样品、不同厂家的激光粒度仪检测结果偏差较大。折射率与吸收率对粒度检测结果有较大影响,折射率的影响比吸收率的影响大,但随着吸收率增大可以逐渐抵消折射率的变化给粒度检测结果带来的波动,使检测结果趋于稳定。通过寻找拟合残差与粒度检测结果之间的变化规律,发现残差值越小,理论散射光强与实际检测光强的偏差越小,检测结果越趋于一个较稳定的值,但对比发现目前激光粒度测试用户根据残差值判断待测样品折射率的方法并没有可靠的依据。通过比较不同样品的最小残差值,发现同种样品的不同粒度区间对应的折射率与吸收率不同,从而证明粒度检测行业内以每种物质固定的折射率和吸收率来进行粒度测试的方法缺乏实际依据。
[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.
【作者单位】：太原理工大学矿业工程学院;北京海林节能科技股份有限公司;清华大学材料学院;淄博清大粉体材料工程有限公司;
【基金】：全国标准样品技术委员会标准样品研制项目(S2014125)
【分类号】：TB302

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