结合平滑时窗-最小二乘法的光泵磁力仪快速高精度频率测量方法

doi:10.3969/j.issn.1000-1158.2023.10.10

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摘要为了提高光泵磁力仪频率测量的精度和速度,提出了一种结合平滑时窗-最小二乘法的光泵磁力仪快速高精度频率测量方法。首先,根据光泵磁力仪频率信号的特点,分析了该方法的测量原理和实现方法。然后,推导了频率测量的公式,分析了影响频率测量精度的因素。最后,设计频率测量实验和室外磁场测量实验对提出的方法进行验证。实验结果证明,该方法明显优于多周期同步测频法,在80~350kHz频率段内均方差均小于2.2×10^-3Hz,在磁场测量实验中,采样频率为200Hz时,噪声功率谱密度为0.001nTHz@1Hz。

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	谭超
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	翟晶晶
	杨隆
	孙其浩

关键词 ：计量学, 光泵磁力仪, 频率测量, 平滑时窗, 最小二乘法

Abstract：In order to improve the precision and speed of frequency measurement of optical pump magnetometer, a fast and high precision frequency measurement method of optical pump magnetometer combined with smooth time window-least square method is proposed. Firstly, according to the characteristics of the frequency signal of optical pump magnetometer, the measurement principle and realization method of the method are analyzed. Then, the formula of frequency measurement is deduced, and the factors that affect the precision of frequency measurement are analyzed. Finally, experiment and an outdoor magnetic field measurement experiment are designed to verify the proposed method. The experimental results show that the method is obviously better than the multi-period synchronous frequency measurement method, and the mean square error in the frequency range of 80~350kHz is less than 2.2×10^-3Hz. In the magnetic field measurement experiment, when the sampling frequency is 200Hz, the noise power spectral density is 0.001nTHz@1Hz。

Key words： metrology;optical pump magnetometer;frequency measurement;smooth time window least square method

收稿日期: 2022-05-17 发布日期: 2023-10-10

PACS:	TB972
	TB939

基金资助:国家自然科学基金(62273200)

作者简介: 谭超(1982-),男,湖北利川人,三峡大学副教授,主要研究方向为电磁场传感器与测量﹑微弱信号检测﹑智能化仪表设计电力电子技术。Email: ctgutc@ctgu.edu.cn

引用本文:

谭超,辛亮,翟晶晶,杨隆,孙其浩. 结合平滑时窗-最小二乘法的光泵磁力仪快速高精度频率测量方法[J]. 计量学报, 2023, 44(10): 1550-1556.
TAN Chao,XIN Liang,ZHAI Jing-jing,YANG Long,SUN Qi-hao. A Fast and High-precision Frequency Measurement Method of Optical Pump Magnetometer Combined with Smooth Time Window-Least Square Method. Acta Metrologica Sinica, 2023, 44(10): 1550-1556.

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http://jlxb.china-csm.org:81/Jwk_jlxb/CN/10.3969/j.issn.1000-1158.2023.10.10 或 http://jlxb.china-csm.org:81/Jwk_jlxb/CN/Y2023/V44/I10/1550

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