A Non-Modulated Triaxial Magnetic Field Compensation Method for Spin-Exchange Relaxation-Free Magnetometer Based on Zero-Field Resonance

Zhao, Jiheng; Liu, Gang; Lu, Jixi; Yang, Ke; Ma, Danyue; Xing, Bozheng; Han, Bangcheng; Ding, M. D.

doi:10.1109/access.2019.2954103

Cited by 11 publications

(3 citation statements)

References 26 publications

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“…For better thermal insulation, the oven is placed in a vacuum environment of a few Pascal; rubber tubing is wrapped around this vacuum chamber to allow for water cooling. A set of flexible coils driven by function generators are glued to the vacuum chamber to generate a triaxial compensation magnetic field [26]. The outside of this chamber is covered with five-layer cylindrical magnetic shielding, which is made of permalloy with high relative permeability.…”

Section: Methodsmentioning

confidence: 99%

Improvement of spin polarization spatial uniformity in optically pumped atomic magnetometers based on counter-propagating pump beams and atomic diffusion

Zhao¹,

Liu²,

Lu³

et al. 2020

Meas. Sci. Technol.

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In an optically pumped alkali vapor cell with a high density of atoms, the attenuation of the pump light generates a spatially non-uniform distribution of the electronic spin polarization of alkali atoms, which is detrimental to biomagnetism applications of magnetometers as well as the hyperpolarization of noble gas atoms. Therefore, in this study, we propose a new scheme to generate a nearly uniform, unsaturated spin polarization region based on counter-propagating pump beams and atomic diffusion. A finite element method-based simulation is used to demonstrate the three-dimensional distribution of the spin polarization in a spherical cell. The effects of cell temperature and pump light power on the homogeneity of the spin polarization are studied. The distribution of spin polarization near the center of the cell is experimentally measured and a 1 cm uniform spin polarization region is achieved in the center of the cell. The uniformity of spin polarization in the center region of the cell increased by 50% compared with single beam pumping. The advantage of our proposed scheme is that it can generate an unsaturated uniform region of spin polarization in the center of a cell using a single species of alkali atoms.

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Section: Methodsmentioning

confidence: 99%

Improvement of spin polarization spatial uniformity in optically pumped atomic magnetometers based on counter-propagating pump beams and atomic diffusion

Zhao¹,

Liu²,

Lu³

et al. 2020

Meas. Sci. Technol.

Self Cite

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“…Li et al devised a parameter modulation algorithm along the pumping direction to perform magnetic compensation [25]. Zhao designed a non-modulated triaxial magnetic field compensation method based on zero-field resonance [26]. However, most algorithms use dual-beam magnetometers, which are difficult to integrate.…”

Section: Introductionmentioning

confidence: 99%

Speedy in-situ magnetic field compensation algorithm for multiple-channel single-beam SERF atomic magnetometers

et al. 2023

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The currently employed algorithms for the magnetic field compensation of single-beam spin-exchange relaxation-free atomic magnetometers are excessively slow and unstable, which limits the use and commercialization of magnetometer arrays for biological magnetic measurement. This study proposes an improved trisection algorithm to compensate for the magnetic field around the vapor cell in an attempt to resolve these limitations. Through the constantly monitoring of the intensity of light emitted from a laser, the proposed algorithm reduces the time required to compensate for magnetic fields to 0.85 s in a single magnetometer, which is 9 times faster than the traditional algorithm, and to 26 s in a 36-channel magnetoencephalography equipment, which is 15.5 times faster than the traditional algorithm. In addition, an approximately 16% increase in measuring sensitivities is achieved based on the improved trisection algorithm compared with the traditional algorithm. These improvements can promote the usage efficiency and commercialization of biological magnetic measurement instruments. Furthermore, the improved trisection algorithm is verified using an experimental setup and the mathematical analysis and comparable experimental results demonstrate the effectiveness of the proposed algorithm.

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“…An atomic magnetometer operating in the spin-exchange relaxation-free (SERF) regime has achieved the highest sensitivity in low-frequency magnetic field measurement --0.16 fT / Hz 1 / 2 [10]. The SERF magnetometer needs to work in SERF regime which requires efficient laser pumping, weak magnetic fields environment and uniform high temperature environment [11][12][13]. Laser pumping technology achieves the spin polarization of alkali metal atoms, so that the alkali metal atomic spin direction is consistent; the weak magnetic field environment is the precondition of the atomic SERF regime, while the uniform high temperature environment is for high density and even distribution of alkali metal atoms.…”

Section: Introductionmentioning

confidence: 99%

Multilayer Spindle Shaped Magnetic Shielding Device for SERF Atomic Magnetometer Application

et al. 2020

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Most of shielding devices currently used for SERF magnetometers are multilayer cylindrical magnetic shielding barrels. This paper studies a new multilayer spindle shaped magnetic shielding barrel for the spin exchange relaxation free (SERF) magnetometer shielding system and uses finite element method (FEM) to compare the analysis results. The results show that the shielding effect of the spindle shaped magnetic shielding barrel is better than the traditional cylindrical magnetic shielding barrel, while the volume is reduced by about 1/5 and the weight is reduced by about 1/4. Therefore, we expect that a smallsized, lightweight , low-cost and more efficient magnetic shielding device can be obtained.

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A Non-Modulated Triaxial Magnetic Field Compensation Method for Spin-Exchange Relaxation-Free Magnetometer Based on Zero-Field Resonance

Cited by 11 publications

References 26 publications

Improvement of spin polarization spatial uniformity in optically pumped atomic magnetometers based on counter-propagating pump beams and atomic diffusion

Improvement of spin polarization spatial uniformity in optically pumped atomic magnetometers based on counter-propagating pump beams and atomic diffusion

Speedy in-situ magnetic field compensation algorithm for multiple-channel single-beam SERF atomic magnetometers

Multilayer Spindle Shaped Magnetic Shielding Device for SERF Atomic Magnetometer Application

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