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Schematic block diagram of the hand-held high-Tc rf SQUID system.
Simplified feedback circuit and the compensation circuit of SQUID.
Normalized SQUID output vs to the frequency.
SQUID output voltage spectrum measured in our laboratory when the compensation was on and off.
Experimental setup of the ECT system using the hand-held high-Tc rf SQUID.
(a) Sample of aluminum plate. (b) Detected signal of the artificial hole defect when moving the SQUID by hand.
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