Hybrid double-D sheet-inducer for SQUID-based NDT

We have developed a High Temperature Superconducting Quantum Interference Device (HTS SQUID)-based eddy current probe that incorporates a Hybrid Double-D (KDD) sheet-inducer coil design for the nondestructive evaluation of conducting materials. Cylindrical high-T/sub c/ superconducting shields assist the device's operation in magnetically noisy environments. Experimental results are presented comparing the flaw response, at various depths, obtained with a conventional sheet inducer with that from the HDD sheet-inducer.