基于交流电磁场检测的深水无损检测探头设计 与关键参数分析.

The traditional underwater alternating current filed measurement（ACFM） does not take into account the influence of shell material on the detection signal and each parameter of the equipment in the simulation design. In order to solve this problem, an ACFM simulation model was established, the size and shape of the magnetic core were optimized and the probe size was reduced. The effects of the conductivity and permeability of the nondestructive testing（NDT） probe housing material on the detection signal were simulated and analyzed. The most suitable shell material for deep water NDT is 304 stainless steel and the best current frequency, and the parameters of the NDT probe were optimized. The results show that when the conductivity of the shell material reaches 107 S/m, the characteristic signal detects by the magnetic sensor reverses and the frequency of the current more than 7 kHz leads to serious distortion of the detection signal. The permeability of shell material attenuates seriously to the amplitude of Magnetic induction intensity Bz in z direction and magnetic induction intensity Bx in x direction. The research results are beneficial to the development and design of NDT. Reset [ABSTRACT FROM AUTHOR]