TY - JOUR
T1 - Magnetometer based on transfer and modulation of magnetic flux using high-critical-temperature superconductor coils
AU - Enpuku, K.
AU - Matsuo, M.
AU - Yoshida, Y.
AU - Yamashita, S.
AU - Sasayama, T.
AU - Yoshida, T.
N1 - Funding Information:
This work was partly supported by Grant-in-Aid for Scientific Research (S) JP15H05764 from the Japan Society for the Promotion of Science.
Publisher Copyright:
© Published under licence by IOP Publishing Ltd.
PY - 2018/7/26
Y1 - 2018/7/26
N2 - We developed a new type of magnetometer to measure low-frequency magnetic fields with an operational principle based on magnetic flux transfer and modulation. This magnetometer consists of three coils: pickup, input and readout coils. The pickup and input coils were made from high-critical-temperature superconductor (HTS) tape and were connected with very low connection resistance to form a closed loop. The magnetic flux that is collected by the pickup coil can be transferred to the input coil even at low frequencies below 1 Hz. The magnetic flux at the input coil is then detected by the readout coil using a readout scheme based on modulation of the mutual inductance M between the input and readout coils. To modulate M over time, a magnetic wire was inserted into the readout coil and a time-varying current was supplied to the wire. Using this time-varying M, the magnetic flux is converted into an amplitude-modulated voltage across the readout coil for measurements. A prototype magnetometer was fabricated for demonstration. This magnetometer can operate at low frequencies down to f = 0.5 Hz without responsivity degradation. The magnetic field noise levels were 8 and 60 pT/Hz1/2 at 50 and 1 Hz, respectively.
AB - We developed a new type of magnetometer to measure low-frequency magnetic fields with an operational principle based on magnetic flux transfer and modulation. This magnetometer consists of three coils: pickup, input and readout coils. The pickup and input coils were made from high-critical-temperature superconductor (HTS) tape and were connected with very low connection resistance to form a closed loop. The magnetic flux that is collected by the pickup coil can be transferred to the input coil even at low frequencies below 1 Hz. The magnetic flux at the input coil is then detected by the readout coil using a readout scheme based on modulation of the mutual inductance M between the input and readout coils. To modulate M over time, a magnetic wire was inserted into the readout coil and a time-varying current was supplied to the wire. Using this time-varying M, the magnetic flux is converted into an amplitude-modulated voltage across the readout coil for measurements. A prototype magnetometer was fabricated for demonstration. This magnetometer can operate at low frequencies down to f = 0.5 Hz without responsivity degradation. The magnetic field noise levels were 8 and 60 pT/Hz1/2 at 50 and 1 Hz, respectively.
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U2 - 10.1088/1742-6596/1054/1/012058
DO - 10.1088/1742-6596/1054/1/012058
M3 - Conference article
AN - SCOPUS:85051341777
VL - 1054
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
SN - 1742-6588
IS - 1
M1 - 012058
T2 - 30th International Symposium on Superconductivity, ISS 2017
Y2 - 13 December 2017 through 15 December 2017
ER -