This work highlights the possibility of structural defect characterization in 2G multilayer high temperature superconducting (HTS) tapes, using eddy current thermography (ECT) at room temperature. A 2D magnetothermal modeling approach is developed, where an integral model is used for the eddy currents modeling in the different layers of the HTS tape, in the frequency domain, and at room temperature, associated to a thermal modeling in the time domain by using the finite difference method. The tape being a very thin multilayer structure presenting multiscale dimensions, a homogenization approach is proposed to reduce the computing time. Thermal mappings allow to verify the detectability of defects which are introduced in the different layers of the tape cross-section. The obtained results are compared with finite element analysis for validation purposes.

这项工作强调了在室温下使用涡流热成像 (ECT) 在 2G 多层高温超导 (HTS) 胶带中表征结构缺陷的可能性。开发了一种二维磁热建模方法，其中积分模型用于在频域和室温下对 HTS 带的不同层中的涡流建模，通过使用与时域中的热建模相关联有限差分法。磁带是一种非常薄的多层结构，呈现多尺度尺寸，提出了一种均质化方法来减少计算时间。热映射允许验证在胶带横截面的不同层中引入的缺陷的可检测性。