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
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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4×10-4rad/Hz,动态范围为110 dB@1 Hz,线性相关系数为99.99%。
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 %.
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 %.
引文
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8 Zhao Zheming,Wu Pinghui,Sui Chenghua.A novel microfibersensor based on white light interferometer[J].Chinese J.Lasers,2010,37(8):2001~2004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
9 Wang Liwei,Liu Yang,Zhang Minet al..Analysis andimprovement of the phase generator carrier method in fiberinterferometer sensors[J].Acta Photonica Sinica,2009,38(4):766~769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
10 Kuang Wu,Zhang Min,Yanbiao Liao.Signal dependence of thephase-generated carrier method[J].Opt.Engng.,2007,46(10):1~5
11 Wang Yan,He Jun,Li Fanget al..Research on phaseconsistency of fiber laser sensor array system based on phasegenerated carrier demodulation[J].Chinese J.Lasers,2010,37(6):1542~1546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
12 Liwei Wang,Min Zhang,Xianhui Maoet al..The arctangentapproach of digital PGC demodulation for optic interferometricsensors[C].SPIE,2006,6292:62921E
2 N.Beverini,E.Maccioni,M.Morgantiet al..Fiber laser strainsensor device[J].J.Opt.A:Pure Appl.Opt.,2007,9(10):958~962
3 Timothy T-Y.Lam,Jong H.Chow,Conor M.Mow-Lowryetal..A stabilized fiber laser for high-resolution low-frequencystrain sensing[J].IEEE Sensors Journal,2009,9(8):983~986
4 Ye Xin,Luo Hong,Hu Yongming.Low-frequency signaldetection technique of fiber-optic interferometric sensor[J].Infrared and Laser Engineering,2010,39(5):845~848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
5 Wang Zefeng,Luo Hong,Xiong Shuidonget al..A J0-J1methodfor measurement of dynamic phase changes in an interferometricfiber sensor[J].Chinese J.Lasers,2007,34(1):105~108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
6 Ni Ming,Hu Yongming,Meng Zhouet al..Dynamic range offiber-optic hydrophone using digitized phase generated carrier[J].Laser&Optoelectronics Progress,2005,42(2):33~37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
7 Wang Zefeng,Hu Yongming.A passive method for resolvingphase shifting of interferometric fiber-optic sensors[J].ChineseJ.Lasers,2007,34(10):1417~1421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
8 Zhao Zheming,Wu Pinghui,Sui Chenghua.A novel microfibersensor based on white light interferometer[J].Chinese J.Lasers,2010,37(8):2001~2004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
9 Wang Liwei,Liu Yang,Zhang Minet al..Analysis andimprovement of the phase generator carrier method in fiberinterferometer sensors[J].Acta Photonica Sinica,2009,38(4):766~769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
10 Kuang Wu,Zhang Min,Yanbiao Liao.Signal dependence of thephase-generated carrier method[J].Opt.Engng.,2007,46(10):1~5
11 Wang Yan,He Jun,Li Fanget al..Research on phaseconsistency of fiber laser sensor array system based on phasegenerated carrier demodulation[J].Chinese J.Lasers,2010,37(6):1542~1546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
12 Liwei Wang,Min Zhang,Xianhui Maoet al..The arctangentapproach of digital PGC demodulation for optic interferometricsensors[C].SPIE,2006,6292:62921E
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