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Improvements in electromagnetic-thermal non-destructive inspection by data processing

机译：通过数据处理改进电磁热非破坏性检查

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摘要

Numerical experiment results are processed by various techniques and the improvements in electromagnetic-thermal non-destructive inspection are investigated. The performances of image subtraction, depiction of the norm of the spatial derivatives of temperature and the Fourier transform are evaluated. Compared to the other methods, the cases for which the results are improved by image subtraction are relatively small. The depiction of the norm of the spatial derivatives is more effective, with the 2nd derivative giving better results than the 1st one. The most effective technique is the Fourier transform, which gives satisfactory results even for very distant cracks. The phase images are sharper than the amplitude ones only in cases where the crack is perpendicular to the current flow. Otherwise, the amplitude images are sharper.
机译：通过各种技术对数值实验结果进行处理，并对电磁热非破坏性检查的改进进行了研究。评估了图像相减的性能，温度空间导数范数的描述以及傅立叶变换的性能。与其他方法相比，通过图像减法改善结果的情况相对较小。对空间导数范数的描述更为有效，其中二阶导数的结果要优于一阶导数。最有效的技术是傅立叶变换，即使在很远的裂纹处也能获得令人满意的结果。仅在裂纹垂直于电流的情况下，相位图像才比振幅图像清晰。否则，振幅图像会更清晰。

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