Research on high-T-c SQUID based non-destructive evaluation |
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| Authors: | Wang Hui-Wu Kong Xiang-Yan Ren Yu-Feng Yu Hong-Wei Ding Hong-Sheng Zhao Shi-Ping Chen Geng-Hu Zhou Yue-Liang Zhang Li-Hu He Yu-Sheng and Yang Qian-Sheng |
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| Affiliation: | Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China |
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| Abstract: | 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. |
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| Keywords: | SQUID resolution eddy current |
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