Numerical Investigation on jC Measurement and Defect Detection by Inductive/Permanent-Magnet Methods
Numerical Investigation on jC Measurement and Defect Detection by Inductive/Permanent-Magnet Methods
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jC 测量和感应/永磁方法缺陷检测的数值研究
DOI：
10.1109/tasc.2013.2248872
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
A. Saito and S. Ohshima
中科院分区：
文献类型：
--
作者：
T. Takayama;S. Ikuno;A. Kamitani;K. Hattori;A. Saito and S. Ohshima
采用数值模拟的方法研究了感应法和扫描永磁法在高温超导薄膜裂纹检测中的适用性。为此，提出了一种计算含裂纹高温超导体屏蔽电流密度的数值方法。该方法通过在裂纹表面沿着施加虚拟电压，使法拉第定律的积分形式在数值上得到满足。数值代码的基础上提出的方法和裂纹的影响，这两种方法进行了数值研究。计算结果表明，在感应法中，裂纹的位置可以粗略地从估计的临界电流密度的精度下降。另一方面，在扫描永磁体方法中，可以通过在两个相反方向上扫描HTS膜来更精确地确定。
The applicability of the inductive method or the scanning permanent magnet method to the crack detection in a high-temperature superconducting (HTS) film is investigated by means of numerical simulation. To this end, a numerical method is proposed for calculating the shielding current density in an HTS containing a crack. In the method, the integral form of Faraday's law is forced to be numerically satisfied by applying the virtual voltage along the crack surface. A numerical code is developed on the basis of the proposed method and the influence of a crack on both methods is numerically investigated. The results of computations show that, in the inductive method, the crack position can be roughly detected from the accuracy degradation of the estimated critical current density. On the other hand, in the scanning permanent magnet method, it can be determined more accurately by scanning an HTS film in two opposite directions.