Numerical Investigation on Crack Detection in HTS Film: Accuracy of Scanning Permanent Magnet Method
Numerical Investigation on Crack Detection in HTS Film: Accuracy of Scanning Permanent Magnet Method
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DOI：
10.1109/tasc.2013.2290711
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发表时间：
2014-06
影响因子：
1.8
通讯作者：
T. Takayama;A. Kamitani
中科院分区：
文献类型：
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作者：
T. Takayama;A. Kamitani
通过模拟两种非接触式临界电流密度测量方法，研究了高温超导薄膜裂纹检测的分辨率。为此，已经开发了一个数值程序，用于分析高温超导薄膜中的屏蔽电流密度与裂纹。利用该代码，对扫描永磁法和感应法进行了数值模拟。计算结果表明，扫描永磁法对裂纹的检测精度较差。如果将感应法应用于通过扫描法获得的区域，则裂纹的检测精度显著提高。将感应法和扫描法相结合，可以实现裂纹的快速、高精度检测。
By simulating two types of the contactless methods for measuring the critical current density, the resolution of the crack detection in a high-temperature superconducting (HTS) film has been investigated. To this end, a numerical code has been developed for analyzing the shielding current density in an HTS film with a crack. By using the code, the scanning permanent magnet method and the inductive one have been reproduced numerically. The results of computations show that the scanning permanent magnet method shows a relatively poor accuracy for the crack detection. If the inductive method is applied to the region obtained by the scanning method, the detection accuracy of the crack is drastically improved. The crack can be detected with high speed and high accuracy by combining the inductive method and the scanning method.