Development of phase-locked loop high-frequency optically pumped atomic magnetometer module operating under unshielded condition

Shun Takeda; Hiroshi Kumagai; Satoru Nebuya

doi:10.1117/12.2578034

5 March 2021 Development of phase-locked loop high-frequency optically pumped atomic magnetometer module operating under unshielded condition

Shun Takeda, Hiroshi Kumagai, Satoru Nebuya

Author Affiliations +

Proceedings Volume 11700, Optical and Quantum Sensing and Precision Metrology; 1170047 (2021) https://doi.org/10.1117/12.2578034
Event: SPIE OPTO, 2021, Online Only

Conference Poster

Abstract

A new measurement method called current-induced magnetic modulation spectroscopy (CIMMS), which measures the electrical impedance in a contactless manner using a high-frequency current and an induced magnetic field, has been proposed. CIMMS is to apply high-frequency minute current to a living body, measure the induced magnetic field with a magnetic sensor to obtain impedance, and measure changes such as respiration, pulse, and inflammation/collapse of lung fields. CIMMS has many advantages such as be able to measure even with clothes on, however, it cannot be realized without a magnetic sensor with high frequency and high sensitivity. Therefore, we focused on optically pumped atomic magnetometer (OPAM) as magnetic sensor used for CIMMS. OPAM has the potential to achieve ultra-high sensitivity and broadband. However, it requires a large and complicated system such as a strict magnetic shield and vibration isolation. Therefore, we developed that small and movable OPAM system that operates under unshielded condition. We also report that we achieved sensitivity of <7.2pT/Hz1/2 at 35~225kHz by using a phase locked loop

Conference Presentation

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Shun Takeda, Hiroshi Kumagai, and Satoru Nebuya "Development of phase-locked loop high-frequency optically pumped atomic magnetometer module operating under unshielded condition", Proc. SPIE 11700, Optical and Quantum Sensing and Precision Metrology, 1170047 (5 March 2021); https://doi.org/10.1117/12.2578034

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