Reduction of Coil-Crack Angle Sensitivity Effect Using a Novel Flux Feature of ACFM Technique.
Reduction of Coil-Crack Angle Sensitivity Effect Using a Novel Flux Feature of ACFM Technique.
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DOI：
10.3390/s22010201
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发表时间：
2021-12-28
期刊：
影响因子：
--
通讯作者：
Yin W
中科院分区：
文献类型：
--
作者：
Huang R;Lu M;Chen Z;Yin W
交流磁场检测技术具有非接触性、能有效降低提离效应等优点，是无损检测领域中最有前途的技术之一。本文提出了一种新的裂纹检测方法，通过使用旋转ACFM技术来减少角裂纹（裂纹方向）的影响。传感器探头由一个激励线圈和两个接收线圈组成。两个接收线圈正交地放置在测量磁场的励磁线圈的中心。结果表明，当传感器探头绕裂纹旋转时，磁场的x分量和z分量的峰值的变化遵循正弦波形状。采用MATLAB中定制的加速有限元法求解器对所设计的传感器探头进行了性能仿真，由于裂纹扰动较小，可显著提高计算效率。并进行了实验验证。结果发现，磁场的z和x分量之间的比率在各种旋转角度下保持稳定。它显示了通过组合来自两个接收线圈的磁场（即，磁场的x和z分量）。
Alternating current field measurement (ACFM) testing is one of the promising techniques in the field of non-destructive testing with advantages of the non-contact capability and the reduction of lift-off effects. In this paper, a novel crack detection approach was proposed to reduce the effect of the angled crack (cack orientation) by using rotated ACFM techniques. The sensor probe is composed of an excitation coil and two receiving coils. Two receiving coils are orthogonally placed in the center of the excitation coil where the magnetic field is measured. It was found that the change of the x component and the peak value of the z component of the magnetic field when the sensor probe rotates around a crack followed a sine wave shape. A customized accelerated finite element method solver programmed in MATLAB was adopted to simulate the performance of the designed sensor probe which could significantly improve the computation efficiency due to the small crack perturbation. The experiments were also carried out to validate the simulations. It was found that the ratio between the z and x components of the magnetic field remained stable under various rotation angles. It showed the potential to estimate the depth of the crack from the ratio detected by combining the magnetic fields from both receiving coils (i.e., the x and z components of the magnetic field) using the rotated ACFM technique.
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