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介绍了大直径锯齿形螺纹中径的在线测量原理，提出了单球单侧测量法；为了解决电感测头量程与测量范围之间的矛盾，采用了平均中径比较法；最后，介绍了基于电感传感器和单片机的大直径锯齿形螺纹中径在线测量系统。
The principle of on-line measurement of large-diameter saw-tooth thread’s middle diameter is introduced and a single-ball single-side measurement method is presented. In order to solve the contradiction between inductance probe’s measuring range and measurement range, an average median diameter comparison method is adopted. Finally, Large Diameter Zigzag Thread Diameter Measurement System with Inductor and Microcontroller.