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首页> 外文期刊>Physica, C. Superconductivity and its applications >Visualization of non-uniform current flow in coated conductors by scanning Hall-probe magnetic microscopy
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Visualization of non-uniform current flow in coated conductors by scanning Hall-probe magnetic microscopy

机译：通过扫描霍尔探针磁显微镜观察涂层导体中不均匀的电流

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摘要

We have visualized non-uniform current flow in RE123 coated conductors by using a scanning Hall-probe magnetic microscopy (SHPM). Newly developed SHPM system allows us to measure two-dimensional magnetic held distribution with high spatial resolution in micro-meter scale. Corresponding current density distribution can be obtained from the magnetic field image by solving inverted Biot-Savart's law. One of the most important advantages of the present system is to visualize the current density distribution in practical high transport current and also in wide scanning area. For example, the system has Current leads with large capacity LIP to 500 A, and the operating distance can be 15 cm by 15 cm with a micro-meter step distance. Using the SHPM system, we have Successfully visualized current density distributions in the coated conductor, and clarified different kinds of non-uniform current flow. Those insights are very useful to identify local defects as well as non-uniform tape quality. These results indicate that the SHPM system is a powerful diagnostic tool not only to observe spatial inhomogeneities of transport property but also to understand their reason in practical coated conductors.
机译：我们已经通过使用扫描霍尔探针磁显微镜（SHPM）可视化了RE123涂层导体中的不均匀电流流动。新开发的SHPM系统使我们能够以微米级的高空间分辨率测量二维磁性保持分布。通过求解反比奥-萨瓦特定律，可以从磁场图像中获得相应的电流密度分布。本系统最重要的优点之一是可视化实际高传输电流以及宽扫描区域中的电流密度分布。例如，该系统具有LIP至500 A的大容量电流引线，工作距离可以是15厘米x 15厘米，步长为微米。使用SHPM系统，我们可以成功地可视化涂层导体中的电流密度分布，并弄清了不同种类的非均匀电流。这些洞察力对于识别局部缺陷以及不均匀的磁带质量非常有用。这些结果表明，SHPM系统是一种强大的诊断工具，不仅可以观察运输特性的空间不均匀性，而且可以了解它们在实际涂覆导体中的原因。

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