Optically pumped magnetometer with dynamic common mode magnetic field compensation

Wang, Yang; Niu, Yaqiong; Ye, Chaofeng

doi:10.1016/j.sna.2021.113195

Cited by 7 publications

(5 citation statements)

References 22 publications

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“…Joonas Iivanainen et al have proposed an array of optically pumped magnetometers for magnetoencephalography, with static and dynamic noise signals measured with reference sensors and fed back to an active three-axis magnetic compensation system [36]. Besides the real-time problem of using the least squares method with separate magnetometers, Yang Wang et al pointed out that the strong common-mode magnetic field limits the gain of amplifiers in the signal condition circuit and wastes most of the effective digits of the analog-to-digital (ADC) converter [37]. Closed-loop compensation can solve this problem.…”

Section: Gradiometer Using Feedback Methodsmentioning

confidence: 99%

“…This idea is similar to that in reference [33], i.e., using the output of one vapor cell to compensate for the field around both vapor cells. The result would be that the field around one Besides the real-time problem of using the least squares method with separate magnetometers, Yang Wang et al pointed out that the strong common-mode magnetic field limits the gain of amplifiers in the signal condition circuit and wastes most of the effective digits of the analog-to-digital (ADC) converter [37]. Closed-loop compensation can solve this problem.…”

Section: Gradiometer Using Feedback Methodsmentioning

confidence: 99%

“…The dichroic mirror was also used as the reflector of the 1550 nm light. Feedback method using single-beam perpendicular modulation to detect a field [37].…”

Section: Gradiometer Using Feedback Methodsmentioning

confidence: 99%

“…Besides the real-time problem of using the least squares method with separate magnetometers, Yang Wang et al pointed out that the strong common-mode magnetic field limits the gain of amplifiers in the signal condition circuit and wastes most of the effective digits of the analog-to-digital (ADC) converter [ 37 ]. Closed-loop compensation can solve this problem.…”

Section: Optically Pumped Gradiometer Under Near-zero Fieldmentioning

confidence: 99%

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Recent Developments in Fabrication Methods and Measurement Schemes for Optically Pumped Magnetic Gradiometers: A Comprehensive Review

Dong,

Ye,

et al. 2023

Micromachines

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Optically pumped gradiometers have long been utilized in measurement in the International Geomagnetic Reference Field (IGRF). With advancements in technologies such as laser diodes and microfabrication, integrated gradiometers with compact sizes have become available, enabling improvements in magnetoencephalography and fetal magnetocardiography within shielded spaces. Moreover, there is a growing interest in the potential of achieving biomagnetic source detection without shielding. This review focuses on recent developments in optically pumped magnetic field gradiometers, including various fabrication methods and measurement schemes. The strengths and weaknesses of different types of optically pumped gradiometers are also analyzed.

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Section: Gradiometer Using Feedback Methodsmentioning

confidence: 99%

Section: Gradiometer Using Feedback Methodsmentioning

confidence: 99%

“…The dichroic mirror was also used as the reflector of the 1550 nm light. Feedback method using single-beam perpendicular modulation to detect a field [37].…”

Section: Gradiometer Using Feedback Methodsmentioning

confidence: 99%

Section: Optically Pumped Gradiometer Under Near-zero Fieldmentioning

confidence: 99%

See 2 more Smart Citations

Recent Developments in Fabrication Methods and Measurement Schemes for Optically Pumped Magnetic Gradiometers: A Comprehensive Review

Dong,

Ye,

et al. 2023

Micromachines

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“…Passive magnetic shields can attenuate the magnetic field of the environment and make their internal magnetic field close to zero, which is widely used in biological magnetic measurement [ 1 , 2 , 3 ], frontier scientific experiments [ 4 , 5 ], and ultra-high precision physical measurement [ 6 , 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Analysis and Measurement of Differential-Mode Magnetic Noise in Mn-Zn Soft Ferrite Shield for Ultra-Sensitive Sensors

Fang

et al. 2022

Materials

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The magnetic noise generated by the ferrite magnetic shield affects the performance of ultra-sensitive atomic sensors. Differential measurement can effectively suppress the influence of common-mode (CM) magnetic noise, but the limit of suppression capability is not clear at present. In this paper, a finite element analysis model using power loss to calculate differential-mode (DM) magnetic noise under a ferrite magnetic shield is proposed. The experimental results confirm the feasibility of the model. An ultrahigh-sensitive magnetometer was built, the single channel magnetic noise measured and the differential-mode (DM) magnetic noise are 0.70 fT/Hz1/2 and 0.10 fT/Hz1/2 @30 Hz. The DM magnetic noise calculated by the proposed model is less than 5% different from the actual measured value. To effectively reduce DM magnetic noise, we analyze and optimize the structure parameters of the shield on the DM magnetic noise. When the outer diameter is fixed, the model is used to analyze the influence of the ratio of ferrite magnetic shielding thickness to outer diameter, the ratio of length to outer diameter, and the air gap between magnetic annuli on DM magnetic noise. The results show that the axial DM magnetic noise and radial DM magnetic noise reach the optimal values when the thickness to outer diameter ratio is 0.08 and 0.1. The ratio of length to outer diameter is negatively correlated with DM magnetic noise, and the air gap (0.1–1 mm) is independent of DM magnetic noise. The axial DM magnetic noise is less than that of radial DM magnetic noise. These results are useful for suppressing magnetic noise and breaking through the sensitivity of the magnetometer.

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Parameter optimisation of miniaturised SERF magnetometer below relaxation rate saturation region

Liu

et al. 2023

Measurement

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Optically pumped magnetometer with dynamic common mode magnetic field compensation

Cited by 7 publications

References 22 publications

Recent Developments in Fabrication Methods and Measurement Schemes for Optically Pumped Magnetic Gradiometers: A Comprehensive Review

Recent Developments in Fabrication Methods and Measurement Schemes for Optically Pumped Magnetic Gradiometers: A Comprehensive Review

Analysis and Measurement of Differential-Mode Magnetic Noise in Mn-Zn Soft Ferrite Shield for Ultra-Sensitive Sensors

Parameter optimisation of miniaturised SERF magnetometer below relaxation rate saturation region

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