基于广义S变换的BOTDR信号包络解调
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摘要
基于BOTDR的布里渊散射分布式光纤传感器所检测的散射光信号非常微弱,且频带在30MHz左右,本文提出应用广义S变换对散射光信号进行幅度解调。广义S变换同时具有短时傅里叶变换和小波变换的优点。通过仿真和实验数据处理验证,基于广义S变换的解调算法可以有效提取BOTDR信号的包络信息,优于传统的Hilbert变换方法,提高了传感系统的检测性能。
The scattering optical signal based on Brillouin scattering distributed sensor is very weak and has a frequency width of about 30 MHz, so it is proposed to demodulate the scattering optical signal’s amplitude with generalized S transform. Generalized S Transform has the advantages of short time Fourier transform and wavelet transform. By simulating and processing the experiment data, it is demonstrated that the demodulation algorithm based on generalized S transform has better result than Hilbert transform and is able to improve the detect performance of sensor.
The scattering optical signal based on Brillouin scattering distributed sensor is very weak and has a frequency width of about 30 MHz, so it is proposed to demodulate the scattering optical signal’s amplitude with generalized S transform. Generalized S Transform has the advantages of short time Fourier transform and wavelet transform. By simulating and processing the experiment data, it is demonstrated that the demodulation algorithm based on generalized S transform has better result than Hilbert transform and is able to improve the detect performance of sensor.
引文
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[8]Pinnegar C R.The Generalized S-Transform and TT-Trans-form,in One and Two Di mensions[D].Ph.D.thesis,Earth Sciences Depart ment,University of Western Ontario,Lon-don,ON,Canada,2001.
[9]Pinnegar C R and Mansinha L.The Bi-Gaussian S-Transform[J].SI AMJ.SCI.COMPUT,2003,24(5):1678-1692.
[2]刘德华,宋牟平,金伟良等.应用于土木工程的布里渊散射分布式监测网络[J].传感技术学报,2003,16(3):277-281.
[3]Kurashi ma T,Tateda M,Horiguchi Tet al.Performance I m-provement of a Combined OTDR for Distributed Strain and Loss Measurement by Randomizingthe Reference Light Polari-zation State[J].IEEE Photon.Tech.Lett,1997,9(3):360-362.
[4]宋牟平,赵斌.希尔伯特变换处理的布里渊散射DOFS的研究[J].光子学报,2005,34(9):1328-1331.
[5]宋牟平,马志刚.基于经典小波变换的布里渊光时域反射计光信号处理[J].光学学报,2007,27(5):819-823.
[6]Stockwell R G,Mansinha L,Lowe R P.Localization of the Complex Spectrum:The S Transform[J].IEEE Transactions on Signal Processing,1996,44(4):998-1001.
[7]陈学华,贺振华.改进的S变换及在地震信号处理中的应用[J].数据采集与处理,2005,20(4):449-453.
[8]Pinnegar C R.The Generalized S-Transform and TT-Trans-form,in One and Two Di mensions[D].Ph.D.thesis,Earth Sciences Depart ment,University of Western Ontario,Lon-don,ON,Canada,2001.
[9]Pinnegar C R and Mansinha L.The Bi-Gaussian S-Transform[J].SI AMJ.SCI.COMPUT,2003,24(5):1678-1692.
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