%0 Journal Article
%T Research on high-T-c SQUID based non-destructive evaluation<br>Research on high-Tc SQUID based non-destructive evaluation
%A Wang Hui-Wu
%A Kong Xiang-Yan
%A Ren Yu-Feng
%A Yu Hong-Wei
%A Ding Hong-Sheng
%A Zhao Shi-Ping
%A Chen Geng-Hu
%A Zhou Yue-Liang
%A Zhang Li-Hu
%A He Yu-Sheng
%A Yang Qian-Sheng
%A <br>王会武
%A 孔祥燕
%A 任育峰
%A 于洪伟
%A 丁红胜
%A 赵士平
%A 陈赓华
%A 周岳亮
%A 张利华
%A 何豫生
%A 杨乾声
%J 中国物理 B
%D 2004
%I 
%X 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.
%K SQUID
%K resolution
%K eddy current<br>SQUID
%K 超导量子器件
%K 临界温度
%K 激发梯度场
%K 分辨率
%K 涡流
%K 无损电磁测试
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=CD8D6A6897B9334F09D8D1648C376FB4&aid=3EB449297DA91AC3DAE6A5284C845D7F&yid=D0E58B75BFD8E51C&vid=FC0714F8D2EB605D&iid=CA4FD0336C81A37A&sid=2A8D03AD8076A2E3&eid=EA389574707BDED3&journal_id=1009-1963&journal_name=中国物理&referenced_num=0&reference_num=10