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介绍了基于自动变频的涡流法裂纹检测系统的原理和实际电路，该系统由于用单片机进行数据采集与处理及ＬＣＤ显示，实现了检测自动化和小型化。
The principle and actual circuit of the eddy current method crack detection system based on automatic frequency conversion are introduced. The system realizes the detection automation and the miniaturization because of the data acquisition and processing and the LCD display.