基于双频锁定的谐振式微光陀螺背散噪声抑制
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摘要
经过十余年的发展,谐振式微光陀螺(RMOG)系统中的光学噪声依旧是制约陀螺输出精度的重要因素,其中背向散射噪声是谐振式微光陀螺系统中的主要光学噪声之一。本文首先分析了背散噪声产生机理,建立了谐振式微光陀螺系统背散噪声数学模型。其次,利用不同频率激光,将CW与CCW光路中的背散噪声与反向光信号的相干噪声信号移频至高频段并滤除,实现背散噪声抑制的方法。并利用双激光器双频锁定的方法进行了验证。实验结果显示,谐振曲线中背散噪声被有效抑制,从而使谐振式微光陀螺系统锁频精度提高了5倍,锁频精度达到6°/h。
Resonant micro optical gyro(RMOG) has been developed for more than ten years.The optical noise in gyro system has always been an important factor of restricting the accuracy of resonant optical gyro.Backscattering noise is one of the main noises in resonant micro optical gyro system.In this paper,the generation mechanism of backscattering noise is analyzed.A mathematical model is established based on the resonant micro optical gyro system.In the experiment,backscattering noise in optical paths and coherent noise signal in the reverse optical signal could been shifted to high frequency band,using two laser frequency-locking technology,and then which can been filter out easily.The experimental results show that the influence of backscattering noise is effectively eliminated in the resonance curve,and the frequency-locking accuracy of the resonant micro optical gyro system is improved about 5 times,and the frequency-locking accuracy is upgrade to 6 °/h.
Resonant micro optical gyro(RMOG) has been developed for more than ten years.The optical noise in gyro system has always been an important factor of restricting the accuracy of resonant optical gyro.Backscattering noise is one of the main noises in resonant micro optical gyro system.In this paper,the generation mechanism of backscattering noise is analyzed.A mathematical model is established based on the resonant micro optical gyro system.In the experiment,backscattering noise in optical paths and coherent noise signal in the reverse optical signal could been shifted to high frequency band,using two laser frequency-locking technology,and then which can been filter out easily.The experimental results show that the influence of backscattering noise is effectively eliminated in the resonance curve,and the frequency-locking accuracy of the resonant micro optical gyro system is improved about 5 times,and the frequency-locking accuracy is upgrade to 6 °/h.
引文
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[17] YANG Guidong,MA Huilian,ZHANG Xulin,et al.Design of high frequency lock-in amplifier applied in R-MDG[J].Chinese Journal of Sensors and Actuators,2005,18(4):863-866.(in Chinese)杨桂东,马慧莲,张旭琳,等.一种应用于谐振式微型光学陀螺的高频锁相放大器的设计[J].传感技术学报,2005,18(4):863-866.
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[19] YAN Shubin,LI Xiaofen,ZHENG Yongqiu,et al.Backscattering noise suppressed by different phase modulation waveform[J].Acta Photonica Sinica,2014,43(10):211-215.(in Chinese)闫树斌,李小枫,郑永秋,等.不同相位调制波形对背向散射噪声的抑制[J].光子学报,2014,43(10):211-215.
[2] Rosenthal A H.Regenerative circulatory multiple-beam interferometry for the study of light-propagation effects[J].Journal of the Optical Society of America,1962,52(10):1143-1147.
[3] Ezekiel S,Balsamo S R.Passive ring resonator laser gyroscope[J].Applied Physics Letters,1977,30(9):478-480.
[4] Sanders G A,Prentiss M G,Ezekiel S.Passive ring resonator method for sensitive inertial rotation measurements in geophysics and relativity[J].Optics Letters,1981,6(11):569-571.
[5] Monovoukas C.Integrated optical gyroscopes offering low cost,small size and vibration immunity[J].Proceedings of SPIE-The International Society for Optical Engineering,2000,3936:293-300.
[6] Wong E,Zhao X,Chang-Hasnain C J,et al.Rayleigh backscattering and extinction ratio study of optically injection-locked 1.55 μm VCSELs[J].Electronics Letters,2007,43(3):182-183.
[7] Salem M,Wolf E.Coherence-induced polarization changes in light beams[J].Optics Letters,2008,33(11):1180-1182.
[8] Bergh R A,Lefevre H C,Shaw H J.Compensation of the optical Kerr effect in fiber-optic gyroscopes[J].Optics Letters,1982,7(6):282-284.
[9] Yu H,Zhang C,Feng L,et al.Limitation of rotation sensing in IORG by Rayleigh backscattering noise[J].Epl,2011,95(6):64001.
[11] Ma H,He Z,Hotate K.Reduction of backscattering induced noise by carrier suppression in wave guide-type optical ring resonator gyro[J].Journal of Lightwave Technology,2011,29(1):85-90.
[12] Mao H,Ma H,Jin Z.Polarization maintaining silica waveguide resonator optic gyro using double phase modulation technique[J].Optics Express,2011,19(5):4632-4643.
[13] Kaiser T J.Experimental developments in the RFOG[J].Proceedings of SPIE-The International Society for Optical Engineering,1991,21(1):1-4.
[14] Kalli K,Jackson D A.Analysis of the dynamic response of a ring resonator to a time-varying input signal[J].Optics Letters,1993,18(6):465-467.
[15] ZHANG Xulin,MA Huilian,DING Chun,et al.Analysis on phase moducation spectroscopy of resonator fiber optic gro[J].Chinese Journal of Lasers,2005,32(11):1529-1533.(in Chinese)张旭琳,马慧莲,丁纯,等.谐振式光纤陀螺调相检测分析[J].中国激光,2005,32(11):1529-1533.
[16] ZHANG xulin,MA huilian DING chun,et al.Analysis on phase modulation spectroscopy of resonator fiber optic gyro[J].Chinese Journal of Lasers,2005,32(11):1529-1533.
[17] YANG Guidong,MA Huilian,ZHANG Xulin,et al.Design of high frequency lock-in amplifier applied in R-MDG[J].Chinese Journal of Sensors and Actuators,2005,18(4):863-866.(in Chinese)杨桂东,马慧莲,张旭琳,等.一种应用于谐振式微型光学陀螺的高频锁相放大器的设计[J].传感技术学报,2005,18(4):863-866.
[18] YANG guiding,MA huilian,ZANG xulin,et al.Design of high freqnency lock-in amplifier applied in R-MOG[J].Chinese Journal of Sensors and Actuators,2005,18(4):863-866.
[19] YAN Shubin,LI Xiaofen,ZHENG Yongqiu,et al.Backscattering noise suppressed by different phase modulation waveform[J].Acta Photonica Sinica,2014,43(10):211-215.(in Chinese)闫树斌,李小枫,郑永秋,等.不同相位调制波形对背向散射噪声的抑制[J].光子学报,2014,43(10):211-215.