通过仿真优化与试验,研制了一套用于承压类管道内壁损伤检测的系统,系统由低频电磁传感器模块、信号发生模块、功率放大模块以及信号调理模块构成。通过低频电磁传感器磁化管道并采集管道的电磁信号,由信号发生和功率放大模块完成对激励线圈的励磁,信号调理模块完成数据放大和滤波,最终实现管道内部缺陷检测。试验结果表明,该低频电磁检测系统灵敏度高,可以实现对直径为152 mm,厚度为16 mm,埋深为12. 8 mm的304不锈钢承压管道内部缺陷的有效检测,且其最佳检测频率为100 Hz~200 Hz。

Through simulation optimization and experiment, a set of inner wall damage detection system for pressure pipeline was developed, which was composed of low-frequency electromagnetic sensor module, signal generation module, power amplifier module and signal conditioning module. The pipeline is magnetized by low-frequency electromagnetic sensor and the electromagnetic signal of the pipeline is collected. The excitation coil is excited by the signal generation and power amplification module, and the data amplification and filtering were completed by the signal conditioning module. Finally, the pipeline internal defect detection is realized. The experimental results showed that the low frequency electromagnetic detection system can effectively detect the internal defects of 304 stainless steel pressure pipe with diameter of 152 mm, thickness of 16 mm and buried depth of 12.8 mm, and the optimal detection frequency was 100 Hz~200 Hz.