High-Tc planar SQUID gradiometer for eddy current non-destructive evaluation
Zhang Ming-Jian(张鸣剑)a), Lang Pei-Lin(郎佩琳)a)b), Peng Zhi-Hui(彭智慧)a), Chen Ying-Fei(陈莺飞)a), Chen Ke(陈珂)a), and Zheng Dong-Ning(郑东宁)a)†
a National Laboratory for Superconductivity, Institute of Physics, and National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China; b Department of Physics, Tsinghua University, Beijing 100084, China
Abstract 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$\varPhi_0/\sqrt{\rm Hz}$. 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.
Received: 09 February 2006
Revised: 03 April 2006
Accepted manuscript online:
Fund: 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.
Cite this article:
Zhang Ming-Jian(张鸣剑), Lang Pei-Lin(郎佩琳), Peng Zhi-Hui(彭智慧), Chen Ying-Fei(陈莺飞), Chen Ke(陈珂), and Zheng Dong-Ning(郑东宁) High-Tc planar SQUID gradiometer for eddy current non-destructive evaluation 2006 Chinese Physics 15 1903
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