用于探测极低频信号的光纤传感器相位生成载波解调方法

王林; 何俊; 李芳; 刘育梁

doi:doi:10.3788/cjl201138.0405001

中国激光, 2011, 38 (4): 0405001, 网络出版: 2011-04-02

用于探测极低频信号的光纤传感器相位生成载波解调方法

Ultra Low Frequency Phase Generated Carrier Demodulation Technique for Fiber Sensors

论文大纲

王林 ^*何俊李芳刘育梁

作者单位

中国科学院半导体研究所光电系统实验室，北京 100083

光纤光学光纤传感光纤干涉仪极低频相位生成载波 fiber optics optical fiber sensing fiber interferometer ultra low frequency phase generated carrier

摘要

提出并实现了一种用于微弱极低频信号探测的干涉式光纤传感器相位生成载波（PGC）解调方法。对PGC解调方法中微分交叉相乘(DCM)及反正切(Arctangent)两种相位抽取算法应用于极低频信号解调进行了理论分析和算法仿真，其结果表明，DCM式PGC算法解调极低频信号时，其结果中存在直流漂移，而Arctangent 式PGC算法的解调结果中不存在直流漂移问题。进而基于光纤干涉仪搭建了极低频光纤传感系统，并进行了两种PGC解调算法的对比实验，实验结果表明，Arctangent式PGC算法不存在DCM式PGC算法解调极低频信号时的直流漂移，且能够准确解调极低频信号，与理论分析的结论相符。最后采用Arctangent式PGC算法实现了极低频干涉式光纤传感系统，该系统达到的最低可探测信号频率为0.01 Hz，最小可探测信号为4×10－4 rad/Hz，动态范围为110 dB @ 1 Hz，线性相关系数为99.99 %。

Abstract

A high resolution ultra low frequency phase generated carrier(PGC) demodulation technique for interferometric fiber sensors is proposed. The differential cross multiplication(DCM) algorithm and the Arctangent algorithm of PGC technique are analyzed theoretically and simulated by computer for ultra low frequency demodulation. And the results show that an unnecessary random direct current (DC) drift is induced in the recovered signal of DCM-PGC, but it doesn′t exit in that of Arctangent-PGC. To demonstrate the conclusion, an optical fiber interferometer-based ultra low frequency sensing system is set up, and the comparable experiments of DCM-PGC and Arctangent-PGC are carried out. The experimental results show that only Arctangent-PGC can be used for ultra low frequency demodulation, for it avoids the problem of DC drift as DCM-PGC. At last the ultra low frequency demodulation system is achieved by Arctangent-PGC, and the testing results show that the system has the lowest frequency of 0.01 Hz, a minimum detectable phase shift of 4×10－4 rad/Hz, a dynamic range of 110 dB @ 1 Hz and a linearity of 99.99 %.

参考文献

[1] 刘育梁, 何俊, 王永杰等. 光纤地震波探测的研究进展［J］. 激光与光电子学进展, 2009, 46(11): 21～28

Liu Yuliang, He Jun, Wang Yongjie et al.. Progress of seismic wave detection by fiber-optic sensors［J］. Laser & Optoelectronics Progress, 2009, 46(11): 21～28

[2] . Beverini, E. Maccioni, M. Morganti et al.. Fiber laser strain sensor device[J]. J. Opt. A: Pure Appl. Opt., 2007, 9(10): 958-962.

[3] . Lam, Jong H. Chow, Conor M. Mow-Lowry et al.. A stabilized fiber laser for high-resolution low-frequency strain sensing[J]. IEEE Sensors Journal, 2009, 9(8): 983-986.

[4] 叶欣, 罗洪, 胡永明. 干涉型光纤传感器低频信号检测技术研究［J］. 红外与激光工程, 2010, 39(5): 845～848

Ye Xin, Luo Hong, Hu Yongming. Low-frequency signal detection technique of fiber-optic interferometric sensor［J］. Infrared and Laser Engineering, 2010, 39(5): 845～848

[5] 王泽锋, 罗洪, 熊水东等. 一种用于干涉型光纤传感器动态相移测量的J0-J1法［J］. 中国激光, 2007, 34(1): 105～108

Wang Zefeng, Luo Hong, Xiong Shuidong et al.. A J0-J1 method for measurement of dynamic phase changes in an interferometric fiber sensor［J］. Chinese J. Lasers, 2007, 34(1): 105～108

[6] 倪明, 胡永明, 孟洲等. 数字化PGC解调光纤水听器的动态范围［J］. 激光与光电子学进展, 2005, 42(2): 33～37

Ni Ming, Hu Yongming, Meng Zhou et al.. Dynamic range of fiber-optic hydrophone using digitized phase generated carrier［J］. Laser & Optoelectronics Progress, 2005, 42(2): 33～37

[7] 王泽锋, 胡永明. 干涉型光纤传感器相位漂移的无源解决方法［J］. 中国激光, 2007, 34(10): 1417～1421

Wang Zefeng, Hu Yongming. A passive method for resolving phase shifting of interferometric fiber-optic sensors［J］. Chinese J. Lasers, 2007, 34(10): 1417～1421

[8] 赵浙明, 吴平辉, 隋成华. 基于白光干涉的新型微纳光纤传感器［J］. 中国激光, 2010, 37(8): 2001～2004

Zhao Zheming, Wu Pinghui, Sui Chenghua. A novel microfiber sensor based on white light interferometer［J］. Chinese J. Lasers, 2010, 37(8): 2001～2004

[9] 王利威, 刘阳, 张敏等. 干涉型光纤传感器相位生成载波技术研究与改进［J］. 光子学报, 2009, 38(4): 766～769

Wang Liwei, Liu Yang, Zhang Min et al.. Analysis and improvement of the phase generator carrier method in fiber interferometer sensors［J］. Acta Photonica Sinica, 2009, 38(4): 766～769

[10] . Signal dependence of the phase-generated carrier method[J]. Opt. Engng., 2007, 46(10): 1-5.

[11] 王延, 何俊, 李芳等. 基于相位载波解调法的多通道光纤激光传感系统相位一致性研究［J］. 中国激光, 2010, 37(6): 1542～1546

Wang Yan, He Jun, Li Fang et al.. Research on phase consistency of fiber laser sensor array system based on phase generated carrier demodulation［J］. Chinese J. Lasers, 2010, 37(6): 1542～1546

[12] Liwei Wang, Min Zhang, Xianhui Mao et al.. The arctangent approach of digital PGC demodulation for optic interferometric sensors［C］. SPIE, 2006, 6292: 62921E

王林, 何俊, 李芳, 刘育梁. 用于探测极低频信号的光纤传感器相位生成载波解调方法[J]. 中国激光, 2011, 38(4): 0405001. Wang Lin, He Jun, Li Fang, Liu Yuliang. Ultra Low Frequency Phase Generated Carrier Demodulation Technique for Fiber Sensors[J]. Chinese Journal of Lasers, 2011, 38(4): 0405001.

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