Magnetometer utilizing cooled normal pickup coil and high-Tc superconducting quantum interference device picovoltmeter for nondestructive evaluation

被引：9
作者：
Yang, TQ [1 ]
Yao, K [1 ]
Yamasaki, D [1 ]
Enpuku, K [1 ]
机构：
[1] Kyushu Univ, Res Inst Supercond Sci & Syst, Higashi Ku, Fukuoka 8128581, Japan
来源：
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS | 2005年 / 44卷 / 20-23期
关键词：
high-T-c SQUID; cooled pickup coil; picovoltmeter; NDE;
D O I：
10.1143/JJAP.44.L626
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
A magnetometer utilizing a cooled normal pickup coil and a high-T-c superconducting quantum interference device (SQUID) picovoltmeter was applied to nondestructive evaluation in an unshielded environment. The pickup coil of copper wire was cooled to T = 77 K in order to decrease thermal noise from resistance. The magnetic field noise of the magnetometer was 130 pT/Hz(1/2) and 10 pT/Hz(1/2) at 100 Hz and 1 kHz, respectively, for the pickup coil with a 4.4 mm diameter. It was shown that the magnetometer could be moved in an unshielded environment without degradation of its performance. By moving the cooled pickup coil, we successfully detected a small crack on the backsurface of the Cu plate in an unshielded environment.
引用
收藏
页码：L626 / L628
页数：3
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