摘要
The nondestructive evaluation (NDE) for the crack inside a graphite slab was investigated by using the high-T(c) SQUID NDE system in unshielded environment. The crack-depth dependence of the crack signal was explored with the excitation frequency varied from 2 to 20 kHz. It was found that the phase of the crack signal is a linear function of the crack depth for various excitation frequencies. In addition, forlinear phase depth relation scaled in an empirical equation with the skin depth as the only variable. The empirical equation was useful in determining the proper excitation frequency for the eddy-current NDE of conductive samples.
原文 | 英語 |
---|---|
頁(從 - 到) | 174-177 |
頁數 | 4 |
期刊 | Physica C: Superconductivity and its applications |
卷 | 372-376 |
發行號 | PART 1 |
DOIs | |
出版狀態 | 已發佈 - 2002 8月 |
對外發佈 | 是 |
ASJC Scopus subject areas
- 電子、光磁材料
- 凝聚態物理學
- 能源工程與電力技術
- 電氣與電子工程