脉冲涡流检测激励参数和激励线圈参数的优化设计

Optimization design of excitation parameters and excitation coil parameters in pulsed eddy current testing

在采用脉冲涡流技术对铁磁性承压设备进行缺陷检测时,脉冲激励参数和激励线圈参数的不同会对检测结果造成较大影响。首先,利用有限元法建立了脉冲涡流检测铁磁性试件厚度的仿真模型;其次,以差分信号峰值为特征分析了脉冲激励参数和激励线圈参数对检测灵敏度和分辨率的影响,依据影响规律确定了脉冲激励参数和激励线圈参数,通过仿真试验确定了在该参数下的有效壁厚检测范围;最后,通过测试件试验,验证了仿真结果的正确性。

While using pulsed eddy current testing technology to detect the wall thickness of ferromagnetic pressure equipment,the difference between the pulsed excitation parameters and the excitation coil parameters will greatly affect the test results.Firstly,a simulation model of pulsed eddy current test for ferromagnetic specimen thickness is established by finite element method.Then,the influence of pulse excitation parameters and excitation coil parameters on the detection sensitivity and resolution is analyzed by taking the differential signal peak as the characteristic.According to the influence law,the pulse excitation parameters and excitation coil parameters are determined,the range of effective wall thickness detection under this parameter is determined by simulation experiment.Finally,the correctness of the simulation results is verified by the test results.