An FSM-Assisted High-Accuracy Autonomous Magnetic Compensation Optimization Method for Dual-Channel SERF Magnetometers Used in Weak Biomagnetic Signal Measurement.

Xinran Tian, Bo Bao, Ridong Wang, Dachao Li

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Article in Sensors (Basel, Switzerland), 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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5 · Who and what money

Authors and funding

4 authors.

Xinran TianState Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin 300072, China.ORCID 0009-0002-3085-5571

Bo BaoState Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin 300072, China.

Ridong WangState Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin 300072, China.ORCID 0000-0002-5449-1752

Dachao LiState Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin 300072, China.

Funding

State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University No. PILAB2407Tianjin Major Science and Technology Program No. 24ZXZSSS00010

6 · The paper itself

Abstract

Atomic magnetometers based on the spin-exchange relaxation-free (SERF) regime have broad applications in bio-magnetic measurement due to their high sensitivity and miniaturized size. In this paper, we propose a SERF-based magnetometer using 1 × 2 polarization-maintaining fiber (PMF) with single-beam parameter optimization. The impacts of temperature, pumping laser power, and modulation amplitude on the magnetometer's response signal at the SERF regime are examined. Moreover, through the simulation of zero-field resonance, the compensation accuracy is optimized. To further improve the compensation stability and accuracy, a novel finite state machine (FSM)-assisted iterative optimization magnetic field compensation algorithm is proposed. A pT-level compensation resolution with an error below 1.6% is achieved, which lays the foundation for the subsequent application of biomagnetic measurement arrays.

Indexed as

biomagnetic measurementfinite state machineiterative optimizationmagnetic field compensationSERF atomic magnetometer

Identifiers

PMID40573574

DOI10.3390/s25123690

PMCPMC12196957

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