High-resolution geomagnetic observation system using HTS-SQUID

Katori, Yuta; Isogami, Shinji; Hato, Tsunehiro; Tsukamoto, Akira; Tanabe, K.; Ohnishi, Nobuhito; Furukawa, Chikara; Okubo, Kan

doi:10.1587/comex.2017xbl0168

Cited by 3 publications

(1 citation statement)

References 8 publications

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“…Besides the applications in oil/gas and mineral exploration as well as geotechnical tasks, R&D on EM phenomena of the Earth's magnetic field using SQUIDs in magnetic observatories and investigation sites especially at very low frequencies [209,210] is still of great interest. Examples are the study of piezo-magnetic and electric effects [211], ionospheric signals [212], seismo-magnetic effects [213] or of the ALF [214].…”

Section: Magnetotelluric Methodsmentioning

confidence: 99%

Superconducting sensors and methods in geophysical applications

Stolz

Schmelz

Zakosarenko³

et al. 2021

Supercond. Sci. Technol.

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More than 50 years ago superconducting quantum interference devices (SQUIDs) were invented. Since then many applications opened up. Already in a 1980 workshop (Weinstock and Overton 1981 SQUID Applications to Geophysics (Society of Exploration Geophysicists)) the application of SQUIDs in geosciences was reviewed. The fabrication and cooling technologies, electronics and other SQUID system components underwent significant improvement within the past years. Thus, SQUIDs are today better suited, more sensitive and effective as well as robust and reliable in operation for geophysical measurements. Many successful application examples, demonstrations and discoveries of mineral resources have been made using them in laboratory devices for investigation of magnetic properties, magnetic exploration, transient electromagnetics and for superconducting gravimeters as well as gravity gradiometers. Therefore, this article intends to review the past, present, and some future aspects of SQUIDs in geo-scientific applications such as e.g. mineral exploration. Since this field is still very active and quite a number of developments are ongoing, this review cannot be comprehensive.

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Section: Magnetotelluric Methodsmentioning

confidence: 99%

Superconducting sensors and methods in geophysical applications

Stolz

Schmelz

Zakosarenko³

et al. 2021

Supercond. Sci. Technol.

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Observation of Geomagnetic Fields Using Superconducting Interference Device Magnetometer

KAWAI

2024

TEION KOGAKU

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Synopsis:We developed the Low-Tc Superconducting Quantum Interference Device (LTS SQUID) magnetometer system to observe geomagnetic fields with high sensitivity. The system is comprised of a three-axis SQUID magnetometer housed in a glass fiber reinforced plastic (GFRP) cryostat, low-drift readout electronics with flux locked loop (FLL) , and a 27-bit data logger with a global positioning system (GPS) and telemetry function. All components operate with batteries. The SQUID magnetometers were electromagnetically shielded in liquid helium, using a cylindrical, copper shield. The system noise was approximately 25 fT/ Hz in the 0.5 -100 Hz frequency range, and the temperature drift of the system was ~1 pT/°C. The liquid helium boil-off rate of the system was 1.2 L/d, and the system could operate for 4 weeks. The system could detect weak geomagnetic signals, such as the Schumann resonance with eighth harmonics, and the Ionospheric Alfvén Resonance appearing at night. Installing two SQUID magnetometer systems at different places around 150 km apart, we performed comparative measurements of the geomagnetic fields successfully. We confirmed that the SQUID magnetometer system was useful for detecting the natural electromagnetic signals with high sensitivity in the extremely low frequency (ELF) range.

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Long-term outdoor observation of geomagnetic fields using tunneling magnetoresistance-based magnetometer and detection of long-period oscillations of geomagnetic pulsations: prospects for earthquake disaster prevention

Isogami

Oishi

Furukawa³

et al. 2021

Appl. Phys. Express

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We investigated the appropriateness of a tunneling magnetoresistance (TMR)-based magnetometer for detecting geomagnetic fields with long-period oscillations through observation of the geomagnetic pulsation (Pi). Pi was not sufficiently observed in the raw outputs due to thermal noise; a bandwidth-limitation treatment helped extract Pi without data stacking. The detectable intensity was reduced to 1 nT with a period of 30 s, but detection was impossible for 100 s. The frequency characteristics revealed that reducing the cutoff frequency of a TMR magnetometer is a promising approach for detecting field oscillations occurring over long periods, such as 100 s.

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High-resolution geomagnetic observation system using HTS-SQUID

Cited by 3 publications

References 8 publications

Superconducting sensors and methods in geophysical applications

Superconducting sensors and methods in geophysical applications

Observation of Geomagnetic Fields Using Superconducting Interference Device Magnetometer

Long-term outdoor observation of geomagnetic fields using tunneling magnetoresistance-based magnetometer and detection of long-period oscillations of geomagnetic pulsations: prospects for earthquake disaster prevention

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