TY - JOUR
T1 - Magnetometer utilizing cooled normal pickup coil and high-Tc superconducting quantum interference device picovoltmeter for nondestructive evaluation
AU - Yang, Tong Qing
AU - Yao, Kenichiro
AU - Yamasaki, Daisuke
AU - Enpuku, Keiji
PY - 2005/9/5
Y1 - 2005/9/5
N2 - 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 130pT/Hz1/2 and 10 pT/Hz1/2 at 100 Hz and 1 kHz, respectively, for the pickup coil with a 4.4mm 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.
AB - 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 130pT/Hz1/2 and 10 pT/Hz1/2 at 100 Hz and 1 kHz, respectively, for the pickup coil with a 4.4mm 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.
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U2 - 10.1143/JJAP.44.L626
DO - 10.1143/JJAP.44.L626
M3 - Article
AN - SCOPUS:23944503760
SN - 0021-4922
VL - 44
SP - L626-L628
JO - Japanese Journal of Applied Physics, Part 2: Letters
JF - Japanese Journal of Applied Physics, Part 2: Letters
IS - 20-23
ER -