A Fast and High-precision Frequency Measurement Method of Optical Pump Magnetometer Combined with Smooth Time Window-Least Square Method
TAN Chao1,XIN Liang1,ZHAI Jing-jing2,YANG Long1,SUN Qi-hao1
1.College of Electrical and Engineering and New Energy, China Three Gorges University, Yichang, Hubei 443002, China
2. No. 710 R&D Institute, CSIC, Yichang, Hubei 443003, China
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。
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.
Li H S. Improved Equal-precision Frequency Measurement Method Based on Phase Shift Technology［J］. Journal of Shanxi Datong University (Natural Science Edition). 2020, 36(2): 14-17.
Fang Y Y, Deng S. Design of Equal Precision Frequency Meter Based on FPGA［J］. Measurement & Control Technology, 2012, 31(10): 1-4.
［8］
Wang H Y, Yao Z M, Shi L Y, et al. The Study of Multi-cycle Frequency Measure System［C］//2010 Second WRI Global Congress on Intelligent Systems. Wuhan, China, 2010: 225-227.
［11］
Angrisani L, M DApuzzo, Grillo D, et al. A new time-domain method for frequency measurement of sinusoidal signals in critical noise conditions［J］. Measurement, 2014, 49: 368-381.
［13］
Dong H, Liu H, Ge J, et al. A High-Precision Frequency Measurement Algorithm for FID Signal of Proton Magnetometer［J］. IEEE Transactions on Instrumentation & Measurement, 2016, 65(4): 898-904.
Li J J, Wu J, Rong L L, et al. High-precision Method of Frequency Measurement for Optical Pumping Magnetometer Based on GPS Timing［J］. Instrument Technique and Sensor, 2018(11): 36-38.
Kirianaki N V, Yurish S Y, Shpak N O. Methods of dependent count for frequency measurements［J］. Measurement, 2001, 29(1): 31-50.
Zhang J, Ping Z, Gang Y. Method of high accuracy frequency measurement［J］. Electrical Measurement & Instrumentation, 2003, 40(6): 16-18.
He C Y, Teng Y T, Hu X X. Realization of high-precision measurement technology for frequency signal of optically pumped magnetometer［J］. Acta Seismologica Sinica, 2021, 43(2): 245-254+136.
［12］
Wang H, Wei Z, Li Z, et al. A time and frequency measurement method based on delay-chain technique［C］//2008 IEEE International Frequency Control Symposium. Honolulu, HI, 2008: 484-486.
He T, Chen X, Hong L L. High-precision frequency detection with APFFT based on FPGA［J］. Electronic Measurement Technology, 2013, 36(8): 80-83+88.
He W, Li C, Lu T. Novel Three-Point Interpolation DFT Method for Frequency Measurement of Sine-Wave［J］. IEEE Transactions on Industrial Informatics, 2017, 13(5): 2333-2338.
Wang X J, An G J, Zhang X Q. Measurement frequency algorithm of weighted phase difference and its application in engineering［J］. Journal of Hebei University of Science and Technology, 2013, 34(5): 446-450+470.
21
2-215.
［24］
Tan C, Wang J C, Li Z L. A frequency measurement method based on optimal multi-average for increasing proton magnetometer measurement precision［J］. Measurement, 2019, 135: 418-423.
［2］
Li J, Quan W, Zhou B, et al. SERF Atomic Magnetometer Recent Advances and Applications: A Review［J］. IEEE sensors journal, 2018, 18(20): 8198-8207.
［9］
Du B Q, Shi L L, Chen Y M, et al. Phase group synchronization between any signals and its physical characteristics［J］. Science China(Physics, Mechanics & Astronomy), 2014, 57(4): 674-679.
Liang Z G. The Four-parameter Sinusoidal Curve-fit Method by Using Combination Methods［J］. Acta Measurement Signal, 2021, 42(12): 1559-1566.
Li Y F, Chen Z J, Zhu W J, et al. Echo Frequency Estimation of Surface Acoustic Wave Resonator Based on Phase Information in Frequency Domain［J］. Acta Measurement Signal, 2020, 41(7): 848-851.
Bao J J, Jiang Z D, Liu W Y. Research on a Time-frequency Measurement Algorithm for Underwater Acoustic Velocity［J］. Acta Measurement Signal, 2022, 43(03): 405-411.
［19］
Reza M S, Ciobotaru M, Agelidis V G. Power System Frequency Estimation by Using a Newton-Type Technique for Smart Meters［J］. IEEE Transactions on Instrumentation & Measurement, 2015, 64(3): 615-624.
Tan C, Zhu B X. The High Precision Frequency Measurement Method for Low SNR Sinusoidal Signal［J］. Acta Measurement Signal, 2015, 36(2):
［23］
Tan C, Yue Z M, Wang J C. Frequency measurement approach based on linear model for increasing low SNR sinusoidal signal frequency measurement precision［J］. Science, Measurement & Technology, IET, 2019, 13(9): 1268-1276.
2023, Vol. 44 
