A Performance-Enhanced Closed-Loop SERF Atomic Magnetometer

作者：Ziao Liu, Jianli Li, Xiaoyu Li, Zhongyu Wang, Jianwei Sheng, Jixi Lu · 发表于：IEEE Sensors Journal · 年份：2024 · DOI：10.1109/jsen.2024.3468009 · 被引用次数：5 · 研究领域：Atomic and Subatomic Physics Research、Magnetic Field Sensors Techniques、Diamond and Carbon-based Materials Research

The spin-exchange relaxation-free (SERF) atomic magnetometers (AMs) exhibit ultrahigh sensitivity in ultraweak magnetic field measurement, but their narrow bandwidth constrains the scope of their applications. To increase the bandwidth, magnetic field closed-loop control technology has been introduced into AMs with demonstrated efficacy. However, previous research on closed-loop AMs resulted in signal distortion problems, primarily due to imprecise closed-loop models and control parameters selection without theoretical support. This problem is specifically characterized by the unexpected amplification or reduction of signals at certain frequencies, directly leading to the degradation of the frequency performance of the closed-loop AM, making it unsuitable for applications requiring full-bandwidth measurement. In this study, we proposed a performance-enhanced closed-loop SERF AM, maximizing the bandwidth while ensuring consistent performance across the entire bandwidth. An accurate closed-loop system model was first established. Subsequently, an optimal relationship between the control parameters was proposed according to the eigenvalues of the closed-loop system, and the particle swarm optimization (PSO) algorithm was introduced to determine the optimal control parameters. The improved closed-loop system was constructed in a triaxial SERF AM, achieving an average bandwidth of 410 Hz and a sensitivity of 10 fT/Hz$^{{1}/{2}}$in three axes, while ensuring consistent performance ...