Magnetometer based on transfer and modulation of magnetic flux using high-critical-temperature superconductor coils

Keiji Enpuku, M. Matsuo, Y. Yoshida, S. Yamashita, Teruyoshi Sasayama, Takashi Yoshida

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

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/Hz 1/2 at 50 and 1 Hz, respectively.

Original languageEnglish
Article number012058
JournalJournal of Physics: Conference Series
Volume1054
Issue number1
DOIs
Publication statusPublished - Jul 26 2018
Event30th International Symposium on Superconductivity, ISS 2017 - Tokyo, Japan
Duration: Dec 13 2017Dec 15 2017

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magnetometers
magnetic flux
critical temperature
coils
modulation
readout
low frequencies
sensors
wire
magnetic fields
inductance
tapes
prototypes
degradation
electric potential

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Magnetometer based on transfer and modulation of magnetic flux using high-critical-temperature superconductor coils. / Enpuku, Keiji; Matsuo, M.; Yoshida, Y.; Yamashita, S.; Sasayama, Teruyoshi; Yoshida, Takashi.

In: Journal of Physics: Conference Series, Vol. 1054, No. 1, 012058, 26.07.2018.

Research output: Contribution to journalConference article

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AU - Sasayama, Teruyoshi

AU - Yoshida, Takashi

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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/Hz 1/2 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/Hz 1/2 at 50 and 1 Hz, respectively.

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