Abstract
SQUID (Super conducting Quantum interference device) has high magnetic sensitivity and high magnetic resolution. Minute magnetic fields up to 10^-8 gauss can be detected by SQUID. Therefore, Nondestructive Testing (NDT) using SQUID can detect the change in magnetic field distribution due to the small defect that cannot be detected by conventional NDT method. The measurement system using SQUID was developed and applied to detect the current path by the measured magnetic field distribution when DC current was applied. It was found that the location of current path and size of line spacing could be identified by measured magnetic field. The measurement system using SQUID could measure the change in the magnetic filed distribution due to the notch in current path. It was considered from these results that the small defect in current path could be detected and evaluated from the magnetic field distribution measured by SQUID.
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