1.前言图1(略)是原来的小通量煤展示装置,也就是人们早已知道的3A 型监测器,该系统是为25年前的煤的设计的,那时的煤含量的细度却比现在低。此系统是以重力作用下掉落在转台上的粉煤的分布状态为依据的。用一叶形板保持展现给辐射粉尘测量传感器的测量床的厚度。后来加了一个用于水分测量的微波衰减 1. Introduction Figure 1 (omitted) is the original small flux coal display device, which is known as the 3A type of monitor, the system is designed for coal 25 years ago, when the fineness of the coal content It is lower than it is now. This system is based on the distribution of pulverized coal falling on the turntable under the action of gravity. The thickness of the measurement couch, which is exposed to the radiation dust measuring sensor, is maintained by a vane. Later added a microwave for moisture measurement attenuation