一、前言随着工业的发展,需对旋转件、移动件中不易触到的部位进行测量,这常常会出现难以克服的困难,其原因主要是由于传感器和显示仪表之间不能用导线相联接。而现代测试技术中所使用的集流环,由于使用维护极不方便,安装困难,噪声大,容易磨损,虽有许多优点也不能得到满意的测试结果。美国肯普贝尔(W.R.Campbell)于1956年曾论 I. Introduction With the development of industry, it is necessary to measure hard-to-reach parts of rotating parts and moving parts, which often result in insurmountable difficulties. The main reason is that sensors and display instruments can not be connected by wires . However, the current collecting rings used in modern testing technology are not easy to use and maintain, difficult to install, loud in noise and easy to wear. Although many advantages are not obtained, satisfactory test results can not be obtained. W.R. Campbell in 1956 in the United States