Measurement Sensitivity Improvement of All-Optical Atomic Spin Magnetometer by Suppressing Noises

Chen, Xiyuan; Zhang, Hong; Zou, Sheng

doi:10.3390/s16060896

Cited by 5 publications

(2 citation statements)

References 23 publications

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“…The conventional demagnetization coils for a multilayer magnetic shield consider the layers as a whole [10,23,27]. In this case, the coils are wound in the toroidal direction, as illustrated in figure 1.…”

Section: Coil Configuration and Experimentsmentioning

confidence: 99%

Minimizing magnetic fields of the low-noise MnZn ferrite magnetic shield for atomic magnetometer

Yang¹,

Lu²,

Wang³

et al. 2021

J. Phys. D: Appl. Phys.

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Several modern precision measurements require a low-noise magnetic shield composed of a MnZn ferrite shield and a multilayer µ-metal shield. However, the residual magnetic field and gradient reduce the performance of the low-noise magnetic shield. An appropriate demagnetization operation is crucial for obtaining a lower residual magnetic field and gradient. This study proposes an improved demagnetization scheme in which the toroidal coil and the solenoidal coil are employed simultaneously, while the ferrite and µ-metal shield layers are wound separately. This allows for a residual field below 0.6 nT and a gradient lower than 0.5 nT cm−1 to be obtained along all three axes within ±20 mm at the center, which is significantly lower than the results published in previous studies. The low-noise magnetic shield used in this study composed of a MnZn ferrite shield with an inner diameter of 112 mm, an outer diameter of 140 mm, and a height of 225 mm, and a five-layer µ-metal shield. This study considerably improves the performance of the low-noise magnetic shields. The proposed scheme can increase the sensitivity of the spin-exchange-relaxation-free atomic magnetometer by approximately 1 fT Hz-1/2. This study can help apply the low-noise magnetic shield in various fields more conveniently, such as low-field nuclear magnetic resonance detection, atomic gyroscope, and in cutting-edge physics research.

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Section: Coil Configuration and Experimentsmentioning

confidence: 99%

Minimizing magnetic fields of the low-noise MnZn ferrite magnetic shield for atomic magnetometer

Yang¹,

Lu²,

Wang³

et al. 2021

J. Phys. D: Appl. Phys.

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show abstract

“…Hz, which worked only in near zero field condition [19]. The noise performance of typical commercial optically pumped magnetometers used in the geomagnetic field are about several hundred fT √ Hz.…”

mentioning

confidence: 99%

Noise Analysis in Pre-Amplifier Circuits Associated to Highly Sensitive Optically-Pumped Magnetometers for Geomagnetic Applications

Liu

Zhuang

et al. 2020

Applied Sciences

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This paper analyzes the noise sources in photoelectric detection circuits with several low-noise operational amplifiers cores. The fabricated circuits are low-noise pre-amplifiers that are used for optically pumped magnetometers. In the proposed circuits, the noise levels of equivalent output voltage are calculated, and the results are in accordance with measurements. With a cooperation of several operational amplifiers, we select LT1028 from linear technologies as the core for our detection circuit, which has an output signal-to-noise ratio of more than 2 × 105 up to the frequency of 100 kHz. By analyzing the individual noise sources in the detection circuit, the dominant noise source is confirmed as the photocurrent shot noise below 200 kHz. Beyond this frequency, the voltage noise source in the operational amplifier dominates. Besides, the lamp power, the radio frequency (RF) power, the temperature variations, and their influences on the sensitivity are studied and optimized. Finally, an optically pumped magnetometer with cesium head is established, showing an intrinsic sensitivity of 85 fT/√Hz. This sensitivity is realized under a geomagnetic magnetic field strength of 53 μT.

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Realization of a high-power, low-noise, 770-nm single-frequency laser by no-cavity frequency doubling scheme

Cao,

Xie,

Zhou

et al. 2025

Optics & Laser Technology

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Measurement Sensitivity Improvement of All-Optical Atomic Spin Magnetometer by Suppressing Noises

Cited by 5 publications

References 23 publications

Minimizing magnetic fields of the low-noise MnZn ferrite magnetic shield for atomic magnetometer

Minimizing magnetic fields of the low-noise MnZn ferrite magnetic shield for atomic magnetometer

Noise Analysis in Pre-Amplifier Circuits Associated to Highly Sensitive Optically-Pumped Magnetometers for Geomagnetic Applications

Realization of a high-power, low-noise, 770-nm single-frequency laser by no-cavity frequency doubling scheme

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