A high-T c SQUID-based non-destructive evaluation (NDE) system has been set up in our laboratory. The SQUID was made on a 24 • bicystal SrTiO 3 substrate. A novel quadruple excitation coil was proposed for the first time and applied in the artificial holes in the aluminium multilayer structure in a noisy unshielded environment. The experimental data shows that it has good balance and is very effective at detecting small hole defects.
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