国外电子测量技术北大中文核心期刊DOI:10.19652/j.cnki.femt.2204358高精度光纤光栅振动解调系统研究与应用*魏鹤鸣车嘉炜侯林嵩刘云启庞拂飞王廷云(上海大学特种光纤与光接入网重点实验室上海201900)摘要:为实现工程系统中对振动信号的检测,提出了一种基于衍射光栅的光纤布拉格光栅(FBG)振动解调系统。解调系统通过色散成像原理获取传感器反射光谱,由所设计的嵌入式单元进行信号处理,并通过专用的上位机解调软件完成数据处理与分析。将系统封装为解调仪器,能实际应用于振动信号的探测。所设计的系统波长解调范围为1525~1570nm,波长重复性可达±1pm,分辨率为0.5pm,可实现8通道复用测量,最高光谱解调速度可达10kHz。实验结果表明,该FBG振动解调系统能够高精度测量不同频率与幅度的振动信号,最小可探测应变约为0.319με/Hz1/2,在结构安全监测等领域具有重要的应用前景。关键词:光纤布拉格光栅;振动传感;光谱检测法;光纤传感中图分类号:TH741文献标识码:A国家标准学科分类代码:510.2Researchandapplicationofhigh-resolutionfiberBragggratingvibrationdemodulationsystemWeiHemingCheJiaweiHouLinsongLiuYunqiPangFufeiWangTingyun(KeyLaboratoryofSpecialOpticalFiberandOpticalAccessNetwork,ShanghaiUniversity,Shanghai201900,China)Abstract:Torealizethedetectionofvibrationsignalsinengineeringsystems,afiberBragggrating(FBG)vibrationdemodulationsystembasedondiffractiongratingisproposed.Thedemodulationsystemacquiresthesensorreflectionspectrumthroughthedispersionimagingprinciple,andthesignalprocessingiscarriedoutbythedesignedembeddedunit,whilethedataprocessingandanalysisarecompletedbythespecialuppercomputerdemodulationsoftware.Thesystemispackagedasademodulationinstrument,whichcanbepracticallyappliedtothedetectionofvibrationsignal.Thedesignedsensingsystemhasawavelengthdemodulationrangefrom1525to1570nm,awavelengthrepeatabilityof±1pm,aresolutionof0.5pm,8-channelmultiplexingwithamaximumspectraldemodulationspeedof10kHz.TheexperimentalresultsshowthattheproposedFBGvibrationsensingsystemcanbeusedforhigh-accuracymeasurementsofvibrationsignalsofdifferentfrequenciesandamplitudeswithaminimumdetectablestrainofabout0.319με/Hz1/2,whichhaspotentialapplicationsinthefieldofs...
