非破壊計測用高性能DC-SQUIDシステム

書誌事項

タイトル別名
  • Development of high performance DC-SQUID system for nondestructive evaluation
  • ヒハカイ ケイソクヨウ コウセイノウ DC-SQUID システム

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抄録

A system for nondestructive measurement is developed using SQUID (Superconducting Quantum Interference Device) gradiometer. The system is composed of a DC-SQUID gradiometer integrated with a pickup coil, a cryostat with thin vacuum space (liquid helium container), a non-magnetic stage for sample and a computer. The pickup coil of SQUID is a coplanar concentric second order gradiometer to remove environmental and background magnetic noises, and to raise spatial resolution. The stage is driven by air pressure using a rod-less-cylinder. The thickness of the bottom of cryostat is 2.5 mm. The magnetic field radiated from a small coil (2mm in diameter and 200 turns) was measured by this system. The results agreed well with calculation results.

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