SERF原子自旋惯性测量检测误差分析及抑制  

Error analysis and suppression of probe system for SERF atomic spin co-magnetometer

作　　者：邢力 全伟[2,3] 宋天骁 蔡庆中 叶文 XING Li;QUAN Wei;SONG Tianxiao;CAI Qingzhong;YE Wen(Division of Thermophysics and Process Measurements,National Institute of Metrology,Beijing 100029,China;Research Institute for Frontier Science,Beihang University,Beijing 100191,China;School of Instrumentation Science and Opto-electronics Engineering,Beihang University,Beijing 100191,China;Beijing Institute of Space Launch Technology,Beijing 100076,China;Division of Mechanics and Acoustic Metrology,National Institute of Metrology,Beijing 100029,China)

机构地区：[1]中国计量科学研究院热工计量科学研究所,北京100029 [2]北京航空航天大学前沿科学技术创新研究院,北京100191 [3]北京航空航天大学仪器科学与光电工程学院,北京100191 [4]北京航天发射技术研究所,北京100076 [5]中国计量科学研究院力学与声学计量科学研究所,北京100029

出　　处：《北京航空航天大学学报》2023年第9期2345-2350,共6页Journal of Beijing University of Aeronautics and Astronautics

基　　金：国家自然科学基金(61803015);中国博士后科学基金(2021M703049)。

摘　　要：在无自旋交换弛豫(SERF)原子自旋惯性测量装置中,检测系统的性能是决定输出信号灵敏度和稳定性极限的关键因素。为有效抑制SERF原子自旋惯性测量的低频随机噪声,在横向电子自旋极化率稳态解和旋光角表达式的基础上,建立检测相关的输出信号误差机理模型,明确了检测系统影响最终测量信号噪声的主要因素。研究结果表明:检测光入射气室时的初始光强作为信号背景直接引起刻度系数的波动而非作用于电子自旋,而检测光的非理想线偏振导致电子自旋产生横向抽运效果和横向光频移作用,从而引入测量误差。针对检测系统影响测量信号噪声的主要参数,设计了参数优化路径:先通过优化检测光频率,提高惯性测量刻度系数,后通过检测光功率的优化,减小横向抽运效应、横向光频移作用及检测光背景波动。实验表明:通过对比输出信号的Allan方差,优化后SERF原子自旋惯性测量的零偏不稳定性减小了1.8倍,速率斜坡噪声系数从0.124 (°)/h^(2)减小至0.041 (°)/h^(2),达到了抑制测量信号低频随机噪声的效果。The performance of the probe system is the key factor to determine the sensitivity and stability limit of the spin-exchange relaxation-free(SERF)atomic spin co-magnetometer for inertial measurement.In order to suppress the low-frequency random noise in SERF auto spin co-magnetometer,the error mechanism model for the probe system is established based on the steady-state solution of transverse electron spin polarization and optical rotation angle.The main factors affecting the output signal of the probe system are clarified.According to model analysis,the initial probe light intensity incident on the vapor cell as the signal background directly causes the fluctuation of the scale coefficient rather than the electron spins.In addition,the non-ideal linear polarization of probe light affects the electron spins in a transverse pumping manner and causes a light shift,both of which can cause measurement error.Aiming at the main parameters affecting the noise,the optimization path has been proposed.The probe light frequency has been first optimized to increase the scale coefficient of inertial measurement.Then the transverse pumping rate,light shift,and background fluctuation have been reduced by optimizing the probe light intensity.According to the analysis of Allan variance,the bias instability of SERF auto spin co-magnetometer is suppressed by 1.8 times,and the coefficients of rate ramp are reduced from 0.124(º)/h^(2) to 0.041(º)/h^(2).Therefore,the effect of reducing the low-frequency random noise in the output signal is achieved.

关 键 词：无自旋交换弛豫 惯性测量 检测系统 误差机理 横向抽运效应 横向光频移 低频随机噪声 

分 类 号：V249.3[航空宇航科学与技术—飞行器设计] TN294[电子电信—物理电子学]