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介绍一种用於采煤机滚筒自动调高的天然γ射线顶板煤厚传感器工作原理，以及单片机最小系统的组成和实验结果。
This paper introduces a working principle of natural γ ray roof coal thickness sensor which is used to automatically raise the drum of drum shearer and the composition and experiment results of the smallest system of single chip microcomputer.