TY - JOUR
T1 - Magnetometer Using Inductance Modulation of High-Critical-Temperature Superconducting Coil for Low-Frequency Field Measurement in Presence of Excitation Fields
AU - Enpuku, Keiji
AU - Matsuo, Masaaki
AU - Yoshida, Yujiro
AU - Yamashita, Shigeya
AU - Sasayama, Teruyoshi
AU - Yoshida, Takashi
N1 - Funding Information:
Manuscript received October 21, 2018; accepted December 14, 2018. Date of publication January 11, 2019; date of current version January 28, 2019. This work was supported by the Grant-in-Aid for Scientific Research (S) from the Japan Society for the Promotion of Science under Grant JP15H05764. (Corresponding author: Keiji Enpuku.) The authors are with the Department of Electrical and Electronic Engineering, Kyushu University, Fukuoka 819-0395, Japan (e-mail:,enpuku@sc.kyushu-u.ac.jp).
Publisher Copyright:
© 2002-2011 IEEE.
PY - 2019
Y1 - 2019
N2 - We have developed a new type of magnetometer using a high-critical-temperature superconductor (HTS) coil. This magnetometer consists of pickup and input coils made from HTS tape. The two coils are connected with very low joint resistance, and the signal flux that is collected by the pickup coil is transferred to the input coil. The signal at the input coil is then read out using a newly developed inductance-modulation scheme. The inductance of the input coil is modulated over time using a magnetic wire that is inserted into the input coil, and the magnetic flux is converted into a signal voltage using this time-dependent inductance. It is demonstrated that this magnetometer can measure low-frequency signal fields down to 0.03 Hz without any reduction in responsivity. The noise level was measured to be 0.85 pT/Hz 1/2 at frequencies above 25 Hz and reached 11 pT/Hz 1/2 at 1 Hz when using a pickup coil with 50 turns and an average diameter of 25 mm.
AB - We have developed a new type of magnetometer using a high-critical-temperature superconductor (HTS) coil. This magnetometer consists of pickup and input coils made from HTS tape. The two coils are connected with very low joint resistance, and the signal flux that is collected by the pickup coil is transferred to the input coil. The signal at the input coil is then read out using a newly developed inductance-modulation scheme. The inductance of the input coil is modulated over time using a magnetic wire that is inserted into the input coil, and the magnetic flux is converted into a signal voltage using this time-dependent inductance. It is demonstrated that this magnetometer can measure low-frequency signal fields down to 0.03 Hz without any reduction in responsivity. The noise level was measured to be 0.85 pT/Hz 1/2 at frequencies above 25 Hz and reached 11 pT/Hz 1/2 at 1 Hz when using a pickup coil with 50 turns and an average diameter of 25 mm.
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U2 - 10.1109/TASC.2019.2892481
DO - 10.1109/TASC.2019.2892481
M3 - Article
AN - SCOPUS:85061209569
SN - 1051-8223
VL - 29
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
IS - 5
M1 - 8610294
ER -