Suppression of Nonuniform Magnetic Fields in Magnetic Shielding System for SERF Co-Magnetometer

Fu, Yang; Wang, Zhuo; Xing, Li; Fan, Wenfeng; Ruan, J.; Pang, Haoying

doi:10.1109/tim.2022.3178738

Cited by 10 publications

(5 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…x along the x-axis through the optical rotation angle, which is detected by the balanced polarimeter [41]. Hence, the high sensitivity for rotation sensing can be realized by this SERF co-magnetometer.…”

Section: Methodsmentioning

confidence: 98%

“…Yet, the strong transmission attenuation near the resonance still cannot be overcame and the stability of incident laser power is a challenge to be guaranteed [39]. Nevertheless, studies on the transverse pumping effect of the optical rotation detection system in recent years have revealed that the polarization rate error is a non-negligible term, such that the stability of transmission will also be affected by polarization fluctuation even with a linear polarized laser [40,41]. Therefore, there is an urgent need to develop a method for optics-based in situ co-magnetometer cell temperature (i.e., atomic density) measurement, which is not influenced by fluctuations in laser intensity.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

In-Situ Detection for Atomic Density in the K-Rb-21Ne Co-Magnetometer via an Optical Heterodyne Interferometry

Liu,

Wang,

Zhai

2023

Photonics

Self Cite

View full text Add to dashboard Cite

The low-frequency fluctuations of the atomic density within the cell can induce the longterm drift of the K-Rb-21Ne spin-exchange relaxation-free (SERF) co-magnetometer output, such that the accurate measurement of in situ atomic density is of great significance for improving the performance of co-magnetometer. In this paper, the complex refractive index model of the spin ensembles under the hybrid optical pumping condition is established first, according to which the relation between atomic density and its complex refractive index is revealed and an optical heterodyne-based scheme for atomic density detection is proposed. The dependence of the atomic density on the demodulated phase signal from the optical heterodyne-based scheme is provided by numerical simulations. After that, a dual acousto-optics frequency shifter (AOFS)-based optical heterodyne interferometry is constructed with a noise level below 1 mrad/Hz for frequencies > 1 Hz, and a compact SERF co-magnetometer is implemented as the testing medium, by which the atomic density detection with resolution of 0.40 K @ 473 K is reached and the experimental results agree well with theoretical simulations. Moreover, the detection scheme proposed in this paper has the properties of high detection sensitivity and immunity to laser power fluctuation, which are also proved experimentally.

show abstract

Section: Methodsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

In-Situ Detection for Atomic Density in the K-Rb-21Ne Co-Magnetometer via an Optical Heterodyne Interferometry

Liu,

Wang,

Zhai

2023

Photonics

Self Cite

View full text Add to dashboard Cite

show abstract

“…Furthermore, some researchers introduced transfer learning into different fields of study (Xu et al 2015;He et al 2022;Kuang et al 2022). In real application, researchers developed more deep neural network architecture for multiple scenarios (Zeng et al 2021;Fu et al 2022;Lin et al 2022;Peng et al 2022).…”

Section: Introductionmentioning

confidence: 99%

A Hierarchical Method for Locating the Interferometric Fringes of Celestial Sources in the Visibility Data

Ma,

Yan,

Cui

et al. 2024

Res. Astron. Astrophys.

View full text Add to dashboard Cite

In celestial source detection in Tianlai project, locating interferometric fringe in visibility data accurately will influence downstream tasks drastically, such as physical parameters estimation and weak celestial source exploration. Considering that traditional locating methods are time-consuming and supervised methods require a great quantity of expensive labeled data, in this paper, we firstly investigate characteristic of interferometric fringes in simulation and real scenario respectively, and integrate almost parameter-free unsupervised clustering method and seeding filling or eraser algorithm to propose a hierarchical plug and play method to improve locating accuracy. Then, we apply our method to locate single and multiple sources' interferometric fringes in simulation data. Next, we apply our method in real data taken from Tianlai radio telescope array. Finally, we do comparison with unsupervised methods of state of the art. These results show that our method has robustness in different scenarios and can improve locating measurement accuracy effectively.

show abstract

“…Electron precession magnetometers do not require low-temperature cooling and have developed rapidly in recent years. In particular, the sensitivity of SERF all-optical electron precession magnetometers can reach the fT or even aT level in near-zero magnetic fields [12][13][14][15]. There is significant application potential in magnetocardiography and magnetoencephalography measurements.…”

Section: Introductionmentioning

confidence: 99%

Multi-Parameter Optimization of Rubidium Laser Optically Pumped Magnetometers with Geomagnetic Field Intensity

Xu,

Ren,

Xiang

et al. 2023

Sensors

View full text Add to dashboard Cite

Rubidium laser optically pumped magnetometers (OPMs) are widely used magnetic sensors based on the Zeeman effect, laser pumping, and magnetic resonance principles. They measure the magnetic field by measuring the magnetic resonance signal passing through a rubidium atomic gas cell. The quality of the magnetic resonance signal is a necessary condition for a magnetometer to achieve high sensitivity. In this research, to obtain the best magnetic resonance signal of rubidium laser OPMs in the Earth’s magnetic field intensity, the experiment system of rubidium laser OPMs is built with a rubidium atomic gas cell as the core component. The linewidth and amplitude ratio (LAR) of magnetic resonance signals is utilized as the optimization objective function. The magnetic resonance signals of the magnetometer experiment system are experimentally measured for different laser frequencies, radio frequency (RF) intensities, laser powers, and atomic gas cell temperatures in a background magnetic field of 50,765 nT. The experimental results indicate that optimizing these parameters can reduce the LAR by one order of magnitude. This shows that the optimal parameter combination can effectively improve the sensitivity of the magnetometer. The sensitivity defined using the noise spectral density measured under optimal experimental parameters is 1.5 pT/Hz1/2@1 Hz. This work will provide key technical support for rubidium laser OPMs’ product development.

show abstract

Suppression of Nonuniform Magnetic Fields in Magnetic Shielding System for SERF Co-Magnetometer

Cited by 10 publications

References 25 publications

In-Situ Detection for Atomic Density in the K-Rb-21Ne Co-Magnetometer via an Optical Heterodyne Interferometry

In-Situ Detection for Atomic Density in the K-Rb-21Ne Co-Magnetometer via an Optical Heterodyne Interferometry

A Hierarchical Method for Locating the Interferometric Fringes of Celestial Sources in the Visibility Data

Multi-Parameter Optimization of Rubidium Laser Optically Pumped Magnetometers with Geomagnetic Field Intensity

Contact Info

Product

Resources

About