中国物理B ›› 2004, Vol. 13 ›› Issue (1): 19-23.doi: 10.1088/1009-1963/13/1/005

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Research on high-T-c SQUID based non-destructive evaluation

王会武, 孔祥燕, 任育峰, 于洪伟, 丁红胜, 赵士平, 陈赓华, 周岳亮, 张利华, 何豫生, 杨乾声   

  1. Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
  • 收稿日期:2003-06-06 修回日期:2003-07-23 出版日期:2004-01-22 发布日期:2007-03-22
  • 基金资助:
    Project supported by the Foundation from the Ministry of Science and Technology of China, and the National Center for R & D on Superconductivity (Grant No NKBRSF-G19990646 and 2002AA306412).

Research on high-Tc SQUID based non-destructive evaluation

Wang Hui-Wu (王会武), Kong Xiang-Yan (孔祥燕), Ren Yu-Feng (任育峰), Yu Hong-Wei (于洪伟), Ding Hong-Sheng (丁红胜), Zhao Shi-Ping (赵士平), Chen Geng-Hua (陈赓华), Zhou Yue-Liang (周岳亮), Zhang Li-Hua (张利华), He Yu-Sheng (何豫生), Yang Qian-Sheng (杨乾声)   

  1. Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2003-06-06 Revised:2003-07-23 Online:2004-01-22 Published:2007-03-22
  • Supported by:
    Project supported by the Foundation from the Ministry of Science and Technology of China, and the National Center for R & D on Superconductivity (Grant No NKBRSF-G19990646 and 2002AA306412).

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摘要： A non-destructive evaluation system based on high-T_c dc-SQUID (superconducting quantum interference device) incorporating a gradient field excitation has been built. By using this system a 1mm-diameter hole at a depth of 2mm inside an aluminium plate at room temperature can be easily detected and imaged in an unshielded environment. The relation between the spatial resolution, or the smallest detectable flaw size, and experimental parameters is briefly analysed in terms of a simple metal ring model. The result shows that the spatial resolution depends strongly on the sensor-sample separation as well as on some other parameters, such as signal-to-noise ratio of excitation, excitation frequency and material conductivity.

关键词: SQUID, resolution, eddy current

Abstract: A non-destructive evaluation system based on high-Tc dc-SQUID (superconducting quantum interference device) incorporating a gradient field excitation has been built. By using this system a 1mm-diameter hole at a depth of 2mm inside an aluminium plate at room temperature can be easily detected and imaged in an unshielded environment. The relation between the spatial resolution, or the smallest detectable flaw size, and experimental parameters is briefly analysed in terms of a simple metal ring model. The result shows that the spatial resolution depends strongly on the sensor-sample separation as well as on some other parameters, such as signal-to-noise ratio of excitation, excitation frequency and material conductivity.

Key words: SQUID, resolution, eddy current

中图分类号:  (Superconducting quantum interference devices (SQUIDs))

  • 85.25.Dq
81.70.Ex (Nondestructive testing: electromagnetic testing, eddy-current testing)