Abstract
Magnetic field mapping measurements were performed using commercial high- T c superconducting quantum interference device (SQUID) sensors. The sensors are incorporated in a fully computerized scanning system and were found to be operative only when encased inside a double-layer mu-metal shield. This allowed us to measure signals of the order of 0.5 nT. In all cases, the field map obtained was consistent with the theoretically expected images. In measurements with two samples, the relative orientation and center-to-center separation of the samples could be easily deduced from the field map. Surface flaw detection of unglazed ceramic tiles under an externally applied magnetic field is also discussed.
Published Version
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