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1、布里渊散射论文：外差检测BOTDR温度和应变传感技术研究【中文摘要】本文介绍了基于布里渊散射的温度和应变传感研究现状,分析了光纤中的布里渊散射特性以及对温度和应变的传感理论,建立了布里渊散射频移和强度与光纤中温度和应变的对应关系。利用布里渊散射和瑞利散射强度之比来消除光纤损耗所带来的影响,从而修正布里渊散射强度的相对变化量,为外差检测BOTDR温度和应变传感技术奠定了理论基础。对外差检测BOTDR传感系统和信号处理方案进行了研究,并对下变频子系统中频率综合器模块的控制进行了重点研究。根据频率综合器的控制要求,设计了微波频率综合器的控制软件使其能够输出所要求的频率分量。采用了将Gola
2、y互补序列应用于BOTDR光纤传感系统的方法,通过对Golay互补序列的时域和频域特性进行理论分析,设计了基于Max+plusII平台的Golay互补序列产生逻辑电路,并进行了仿真分析,设计产生了码元长度可变、码元宽度可调的高速率Golay互补序列,同时对应用Golay互补序列的BOTDR传感系统从信噪比、动态范围和测量时间上进行了分析,并对传感系统从时域和频域的角度进行了Matlab仿真,结果表明调制成Golay互补序列的光脉冲较单脉冲传感系统在系统信噪比、温度和应变分辨率等方面能够改善系统的性能。搭建了部分实验系统,完成了基于AOM光脉冲调制的前向光路时域波形测试。【英文摘要】T
3、heresearchconditionoftemperatureandstrainsensingbasedonBrillouinscatteringhasbeenintroducedinthisthesis.ThecharacteristicsandthesensingmechanismoftemperatureandstrainbasedonBrillouinscatteringinopticalfiberhavebeenanalyzed,andthetemperatureandstraindependencesofBrillouinfrequencyshiftandintensi
4、tyhavebeenfounded.TheratiooftheBrillouinscatteringlightpowerandRayleighscatteringlightpowerisusedtoeliminatetheimpactofopticallosstocompensatetheBrillouinscatteredlightpowervariation,andtoestablishthedesigntheoryofBOTDRbasedtemperatureandstrainsensorsystemusingheterodynedetection.Sensingsystema
5、ndsignalprocessingbasedonheterodynedetectionhavebeenstudied.Themicrowavefrequencysynthesizerindownconvertersubsystemhasbeenstudiedindetail.ThemethodofapplyingGolaycomplementarysequencesinBrillouinsensingsystemhasbeenused.AhighspeedGolaycomplementarycodewithavariablelengthandadjustablewidthisdes
6、ignedbasedonMax+plusIIaccordingtotheprincipleofGolaycomplementarysequences,andwaveformsimulationhasbeendone.Inthemeanwhile,theperformanceofBOTDRsensingsystemapplyingGolaycomplementarysequencesisanalyzedfromthesignaltonoiseratio,dynamicrangeandmeasurementtimeofthesensingsystem.Thesensingsystemha
7、sbeensimulatedfromtimedomainandfrequencydomain,andthesimulationresultsoftheMatlabshowthatthesignaltonoiseratio,temperatureandstrainresolutionofthesystemaregreatlyimprovedbytheemploymentofGolaycomplementarypulsemodulationandcorrela
