2001
DOI: 10.1002/ecjb.1027.abs
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Development of SQUID sensor for nondestructive evaluation: Optimization of the integrated concentric DC‐SQUID gradiometer

Abstract: SUMMARYWe have developed concentric multiloop DC-SQUID gradiometers for nondestructive evaluation, which were integrated on a 3 u 3 mm 2 Si chip using Nb thin-film fabrication technology. In order to obtain high spatial resolution and to cancel magnetic noise, a coplanar concentric second-order derivative coil was adopted for the pick-up coil. The gradiometer has obtained a perfectly symmetrical structure by directly using the pick-coil coil as the SQUID loop. Moreover, the self-inductance of the SQUID loop wa… Show more

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