AI Article Synopsis
- Triaxial magnetic field compensation is essential for achieving a zero-field environment in optically pumped magnetometers (OPMs).
- This study introduces a two-step method using a single-beam configuration that includes pre-compensation and precise compensation to effectively neutralize ambient magnetic fields.
- Experimental results demonstrate that this approach achieves a compensation resolution of better than 1 picotesla (pT), making it suitable for high-precision applications like magnetocardiography (MCG) and magnetoencephalography (MEG).
Article Abstract
Triaxial magnetic field compensation is crucial for a zero-field optically pumped magnetometer (OPM) in pursuit of a zero-field environment. In this work, we demonstrate a triaxial magnetic field compensation method for zero-field OPM based on single-beam configuration. It consists of two procedures: (1) pre-compensation to preliminarily cancel out ambient residual magnetic field by low-frequency magnetic field modulation; and (2) precise compensation to further compensate the residual magnetic field by high-frequency magnetic field modulation. This scheme enables rapid and precise compensation of a large-scale magnetic field and supports real null-point acquisition of the triaxial residual magnetic fields with simple processes. The experimental results show that the compensation resolution on the sensitive axis is better than 1 pT and significantly less than the fluctuation of experimental environments. Our work targets on the quick generation of a zero-field environment for high precision OPM, which is especially advantageous for emerging applications including magnetocardiography (MCG) and magnetoencephalography (MEG).
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| http://dx.doi.org/10.1364/OE.464361 | DOI Listing |
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