| High-Tc planar SQUID gradiometer for eddy current non-destructive evaluation |
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| 引用本文： | 张鸣剑,郎佩琳,彭智慧,陈莺飞,陈 珂,郑东宁. High-Tc planar SQUID gradiometer for eddy current non-destructive evaluation[J]. 中国物理, 2006, 15(8): 1903-1908 |
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| 作者姓名： | 张鸣剑 郎佩琳 彭智慧 陈莺飞 陈 珂 郑东宁 |
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| 作者单位： | National Laboratory for Superconductivity, Institute of Physics, and National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China;National Laboratory for Superconductivity, Institute of Physics, and National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China;Department of Physics, Tsinghua University, Beijing 100084, China;National Laboratory for Superconductivity, Institute of Physics, and National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China;National Laboratory for Superconductivity, Institute of Physics, and National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China;National Laboratory for Superconductivity, Institute of Physics, and National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China;National Laboratory for Superconductivity, Institute of Physics, and National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China |
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| 基金项目： | Project supported by Ministry of Science and Technology of China(Grant Nos 2006CB601007 and 2002AA306412 ), National Nature Science Foundation of China (Grant No 10221002) and Chinese Academy of Sciences and National Center for Nanoscience and Technology, China. |
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| 摘 要： | This paper reports the fabrication and test of a high-Tc SQUID planar gradiometer which is patterned from YBCO thin film deposited on a SrTiO3 bicrystal substrate. The measurement of noise spectrum at 77K shows that the white noise at 200 Hz is about 1×10^-4 φ0/√Hz. The minimal magnetic gradient is measured and the results suggest that the minimal magnetic gradient is 94 pT/m. The planar gradiometer is used in non-destructive evaluation （NDE） experiments to detect the artifacts in conducting aluminium plates by performing eddy current testing in an unshielded environment. The effect of the exciting coil dimension on the NDE results is investigated. By mapping out the induced field distribution, flaws about 10mm below the plate surface can be clearly identified.
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| 关 键 词： | 平面重力梯度仪 SQUID NDE 涡流 非破坏性评估 理论物理 |
| 收稿时间： | 2006-02-09 |
| 修稿时间： | 2006-04-03 |
High-Tc planar SQUID gradiometer for eddy current non-destructive evaluation |
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| Zhang Ming-Jian,Lang Pei-Lin,Peng Zhi-Hui,Chen Ying-Fei,Chen Ke and Zheng Dong-Ning. High-Tc planar SQUID gradiometer for eddy current non-destructive evaluation[J]. Chinese Physics, 2006, 15(8): 1903-1908 |
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| Authors: | Zhang Ming-Jian Lang Pei-Lin Peng Zhi-Hui Chen Ying-Fei Chen Ke Zheng Dong-Ning |
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| Abstract: | This paper reports the fabrication and test of a high-Tc SQUID planargradiometer which is patterned from YBCO thin film deposited on a SrTiOxj{3}bicrystal substrate. The measurement of noise spectrum at 77K shows that the whitenoise at 200 Hz is about 1×10-4{Phi0/sqrt Hz. Theminimal magnetic gradient is measured and the results suggest that the minimalmagnetic gradient is 94 pT/m. The planar gradiometer is used in non-destructiveevaluation (NDE) experiments to detect the artifacts in conducting aluminium platesby performing eddy current testing in an unshielded environment. The effect of theexciting coil dimension on the NDE results is investigated. By mapping out theinduced field distribution, flaws about 10mm below the plate surface can be clearlyidentified. |
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| Keywords: | SQUID planar gradiometer NDE |
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