超電導材料特性計測技術―マッピング技術の進展を中心として―高温超伝導ＳＱＵＩＤを用いた銅製伝熱管表面の微細欠陥の非破壊検査
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概要
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A nondestructive inspection (NDI) system using an HTS SQUID for copper heat-exchanger tubes has been constructed. An eddy-current-based NDI method using an HTS SQUID gradiometer cooled using a cryocooler was employed for the detection of micro flaws in thin copper tubes 6.35 mm in diameter and 0.8 mm in thickness. With an excitation field of 1.6 μT at 5 kHz, a flaw in the tube, measuring 30 μm deep and 15 mm long, was successfully detected by the system with a high signal-noise ratio of at least 20. Numerical simulations were also conducted to determine how many sensors would be required for inspection around the circumference of an entire tube.
- 公益社団法人 低温工学・超電導学会 (旧 社団法人 低温工学協会)の論文
公益社団法人 低温工学・超電導学会 (旧 社団法人 低温工学協会) | 論文
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