基于电磁超声横波的管道剩余厚度检测

为实现管道剩余厚度的精确检测，设计了一种基于电磁超声横波的非接触式管道厚度检测系统。采用自研的电磁超声大功率激励源与换能器产生测厚横波，并由接收器对回波电压信号进行实时滤波和处理，得到铝制管道的精确剩余厚度。针对电磁超声回波的小信号和低信噪比对激励线圈参数进行优化，在此基础上对横波声束在圆形管道界面辐射特性进行分析。根据换能器线圈匝数、线圈宽度分别为回波信号峰峰值和信噪比的最大影响因子，设计优化后检测换能器并实现了误差小于0.2%的剩余厚度检测。 

Residual thickness detection of pipeline based on electromagnetic ultrasonic shear wave

To accurately detect the residual thickness of pipeline, a non-contact pipeline thickness detection system based on the electromagnetic ultrasonic shear wave was designed. The system adopts a self-developed electromagnetic ultrasonic high-power excitation source and a transducer to generate shear wave, and the receiver is used to filter and process the echo voltage signal in real-time to obtain the accurate residual thickness of the aluminum pipe. The excitation coil parameters were optimized to improve the small-signal and low signal-to-noise ratio of the receiving signal. On this basis, the beam radiation of shear waves propagating within the pipe was analyzed. Based on the fact that the number of turns of the coil and the width of the coil are the majority influence factors to the peak-to-peak value of the echo signal and the SNR respectively, the transducer is designed and the residual thickness detection accuracy with the error less than 0.2% is achieved.