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文中详细介绍了利用光透过率法测量煤粉颗粒比表面积平均直径的原理和测量装置，给出了实际测量数据，取得了与筛分法一致的结果，使用普通的光电测量装置，本法测量极限误差一般可小于２％ 。
In this paper, the principle and measurement device for measuring the average specific surface area of pulverized coal powder by light transmittance method are introduced in detail. The actual measurement data are obtained and the results consistent with the screening method are obtained. Using ordinary photoelectric measuring device, Measurement limit error can generally be less than 2%.