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The influence of the exciting frequency on crack detection by eddy current thermography

机译：励磁频率对涡流热像仪检测裂纹的影响

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摘要

The influence of the exciting frequency on crack detection by eddy current thermography is investigated experimentally. The performance of a coil designated C16 with exciting frequency 32 kHz in the detection of eight cracks in circular aluminium plates, at various positions and orientations, is compared with the performance of two coils (designated C8 and C15) with exciting frequency 50 Hz. Crack detection is based not only on the thermograms but also on data processing techniques. The coil C16 proved to be the most effective as it detected seven cracks out of the eight, whereas the C8 coil detected five cracks and the C15 four. Furthermore, in most cases, it gave sharper images of the crack. Elevated heating rates are induced by higher exciting frequencies, resulting in elevated values of current density and heat flow. Therefore, wider detection regions and longer detection periods may be achieved.
机译：实验研究了励磁频率对涡流热像仪检测裂纹的影响。比较了用C16励磁频率为32 kHz的线圈在圆形铝板上在不同位置和方向上检测到的八个裂纹时的性能与两个使用50 Hz励磁频率的线圈（分别为C8和C15）的性能。裂缝检测不仅基于热分析图，而且还基于数据处理技术。线圈C16被证明是最有效的，因为它检测到八个裂纹中的七个，而C8线圈检测到五个裂纹，而C15四个。此外，在大多数情况下，它给出的裂纹图像更清晰。较高的激励频率会导致加热速率升高，从而导致电流密度和热流值升高。因此，可以实现更宽的检测区域和更长的检测周期。

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