Detection of the Cracks using High-Tc SQUID

NDE of coated-conductor using HTS SQUID array

“…1 shows the principle of our system to detect defects in striated conductors. We employed a conventional eddy current NDE technique with SQUIDs as sensitive magnetic detectors [10][11][12]. A 5-channel HTS SQUID gradiometer array were placed above the coated conductor with a lift-off of about 1.5 mm, and detected the vertical element of magnetic field gradient induced around defects by an eddy current.…”