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Vacuum arc phenomena under various axial magnetic fields are observed using high speed VTRs. We use disk type contacts and axial magnetic fields generated by external coils. First, we confirmed the arc behavior and arc voltage under various axial magnetic fields. As already known, the behavior of vacuum arcs and arc voltage are stabilized by increasing the axial magnetic fields. Second, using small...
A micro Eddy Current Testing (ECT) system for planar thin specimens made of INCONEL 600 with flaws was proposed and developed. A micro ECT probe used here consists of a conventional pancake-type coil as an exciting coil and a micro magnetic sensor array as a set of pickup coils. Magnetic field perturbation due to a flaw was measured with high spatial resolution and signal-to-noise (S/N) ratio. The...
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