Eddy-Current-Based Nondestructive Inspection System Using Superconducting Quantum Interference Device for Thin Copper Tubes
Eddy-Current-Based Nondestructive Inspection System Using Superconducting Quantum Interference Device for Thin Copper Tubes
复制标题
基于涡流的薄铜管超导量子干涉装置无损检测系统
DOI：
10.1143/jjap.43.l1488
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发表时间：
2004
影响因子：
1.5
通讯作者：
Saburo Tanaka
中科院分区：
文献类型：
--
作者：
Y. Hatsukade;A. Kosugi;K. Mori;Saburo Tanaka
利用超导量子干涉器件(SQUID)在同轴脉冲管制冷机中冷却，建立了基于涡流的无损检测系统，利用高温超导SQUID梯度仪和类亥姆霍兹线圈感应器对铜管上的微缺陷进行了检测。利用SQUID-NDI系统对外径6.35 mm、厚度0.825 mm的铜管上几十微米深的人工缺陷进行了检测。当激励磁场为1.6µT，频率为5 kHz时，在信噪比至少为20的情况下，该系统成功地检测到了30µm深的缺陷。缺陷产生的磁信号幅度与激励频率和缺陷深度的平方成正比。考虑到系统的灵敏度，结果表明，SQUID-NDI系统可以检测到小于10微米深的缺陷。
An eddy-current-based nondestructive inspection (NDI) system using superconducting quantum interference device (SQUID) cooled using a coaxial pulse tube cryocooler was constructed for the inspection of microflaws on copper tubes employing a high-Tc SQUID gradiometer and a Helmholtz-like coil inducer. The detection of artificial flaws several tens of µm in depth on copper tubes 6.35 mm in outer diameter and 0.825 mm in thickness was demonstrated using the SQUID-NDI system. With an excitation field of 1.6 µT at 5 kHz, a 30-µm-depth flaw was successfully detected by the system at an SN ratio of at least 20. The magnetic signal amplitude due to the flaw was proportional to both excitation frequency and the square of flaw depth. With consideration of the system's sensitivity, the results indicate that sub-10-µm-depth flaws are detectable by the SQUID-NDI system.