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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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

Received: 17 May 2022 Published: 10 October 2023

PACS:	TB972
	TB939

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	Articles by authors
	TAN Chao
	XIN Liang
	ZHAI Jing-jing
	YANG Long
	SUN Qi-hao

Cite this article:

TAN Chao,XIN Liang,ZHAI Jing-jing, et al. A Fast and High-precision Frequency Measurement Method of Optical Pump Magnetometer Combined with Smooth Time Window-Least Square Method[J]. Acta Metrologica Sinica, 2023, 44(10): 1550-1556.

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

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