分布式光纤拉曼测温系统中解调算法的优化
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摘要
针对分布式光纤拉曼测温系统传统的温度解调算法进行了优化,提出了补偿光纤色散以及光纤损耗两种算法。通过重合处理补偿因反斯托克斯光与斯托克斯光信号的衰减速度不同而造成的温度解调误差;通过色散补偿算法对斯托克斯散射信号的位置进行修正,弥补因两束光的传播速度不同造成的测量误差,提高了系统的测温精度和定位精度。
The traditional temperature demodulation method of the distributed fiber Raman temperature measurement system had been optimized.New compensation methods for fiber loss and fiber dispersion are proposed.The temperature demodulation error caused by the different attenuation speed between stokes and anti-stokes scattering signals is compensated by the coincidence processing.The position of stokes backscattering signal is corrected by the compensation method for fiber dispersion,which compensated the measurement error caused by the different speed of two beams,and improved the accuracy of temperature measurement and position location.
The traditional temperature demodulation method of the distributed fiber Raman temperature measurement system had been optimized.New compensation methods for fiber loss and fiber dispersion are proposed.The temperature demodulation error caused by the different attenuation speed between stokes and anti-stokes scattering signals is compensated by the coincidence processing.The position of stokes backscattering signal is corrected by the compensation method for fiber dispersion,which compensated the measurement error caused by the different speed of two beams,and improved the accuracy of temperature measurement and position location.
引文
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[2]Saxena M K,Raju S J,Arya R,et al.Empirical mode decomposition-based detection of bend-induced error and its Correction in a Raman optical fiber distributed temperature sensor[J].IEEESensors Journal,2016,16(5):1243-1252.
[3]Soto M A,Nannipieri T,Signorini A,et a.Raman-based distributed temperature sensor with 1m spatial resolution Over26km SMF using low-repetition-rate cyclic pulse coding[J].Optics Letters,2011,36(13):2557-2559.
[4]Luo S,Chang J,Zhang S S,et al.Reliability analysis and comparison of demodulation methods for Raman distributed temperature sensor[J].Optical&Quantum Electronics,2014,46(12):1595-1608.
[5]侯培国.分布式光纤温度传感系统的理论与实验研究[D].燕山大学,2003.Hou Peiguo.Theory and experiment research on fiber optic distributed temperature sensor system[D].Yanshan University,2003.
[6]刘扬,侯思祖.基于拉曼散射的分布式光纤测温系统的分析研究[J].电子设计工程,2009,17(1):23-25.Liu Yang,Hou Sizu.Analysis and study of the distributed fiber temperature detecting system based on raman scattering[J].E-lectronic Design Engineering,2009,17(1):23-25.
[7]张明江,李健,刘毅,等.面向分布式光纤拉曼测温的新型温度解调方法[J].中国激光,2017(3):213-220.Zhang Mingjiang,Li Jian,Liu Yi,et al.Temperature demodulation method for distributed fiber raman temperature measurement[J].Chinese Journal of Laser,2017(03):219-226.
[8]Wang Z L,Zhang S S,Chang J,et al.Attenuation auto-correction method in Raman distributed temperature measurement system[J].Optical&Quantum Electronics,2013,45(10):1087-1094.
[9]金祁平.基于拉曼散射的光纤测温系统设计与研究[D].大连海事大学,2017.Jin Qiping,Design and research of fiber temperature measurement system based on raman scattering[D].Dalian Maritime U-niversity,2017.
[10]王伟杰.基于拉曼散射的分布式光纤测温系统设计及优化[D].山东大学,2013.Wang Weijie,Design and optimization of distributed fiber temperature sensor based on raman scattering[D].Shandong University,2013.
[11]王宗良.分布式光纤拉曼温度传感系统信号处理及性能提升[D].山东大学,2015.Wang Zongliang.Signal processing and performance improvement for distributed fiber raman temperature sensor[D].Shandong University,2015.
[12]Wang W,Chang J,Lv G,et al.Wavelength dispersion analysis on fiber-optic Raman distributed temperature sensor system[J].光子传感器:英文版,2013,3(3):256-261.
[13]朱海鹏.基于拉曼散射效应的分布式光纤测温系统研究[D].重庆大学,2015.Zhu Haipeng.A study on distributed optical fiber temperature measurement system based on raman scattering[D].Chongqing University,2015.