Performance measurements of a superconductive microprobe for eddy current evaluation of subsurface flaws
Performance measurements of a superconductive microprobe for eddy current evaluation of subsurface flaws
复制标题
用于涡流评估地下缺陷的超导微探针的性能测量
DOI：
10.1109/77.233587
复制
发表时间：
1993
影响因子：
1.8
通讯作者：
W. Podney
中科院分区：
文献类型：
--
作者：
W. Podney
首先对超导微探头的性能进行了测试，结果表明其景深和分辨率远远优于传统的涡流探头。结果表明，该超导微探头可以检测2024铝中毫米级的缺陷，深度可达5 mm。它还可以很容易地检测到由于两块2.29毫米厚的7075铝板粘合线的腐蚀而造成的1.4%的材料损失。腐蚀斑块直径为15.9 mm。该样机显示了三个主要限制：距离、反馈电路中的电子噪声以及扫描测试表面时倾斜波动的干扰。减小拾取器环路和源线圈的大小可以减小对准距离和倾斜干扰。使用数字电路可以抑制反馈电路的噪声。
First measurements of the performance of the superconductive microprobe show that its depth of field and resolution are far superior to those of conventional eddy-current probes. It is shown that the superconductive microprobe can detect millimeter-size flaws to depths of 5 mm in 2024 aluminum. It also easily detects a 1.4% loss in material owing to corrosion at the bond line of two 2.29-mm-thick, 7075 aluminum plates. The corrosion patch is 15.9 mm in diameter. The prototype shows three main limitations: standoff distance, electronic noise in the feedback circuitry, and interference from fluctuations in tilt while scanning a test surface. Decreasing the size of the pickup loops and source coil can decrease both the standoff distance and interference from tilt. Using digital circuitry can suppress the noise of feedback circuitry.<<ETX>>