预览加载中，请您耐心等待几秒...

光纤光栅于地震检波器方向的应用.docx

预览
1/3
2/3
3/3

在线预览结束，喜欢就下载吧，查找使用更方便

下载提示 文本预览

如果您无法下载资料，请参考说明：

1、部分资料下载需要金币，请确保您的账户上有足够的金币

2、已购买过的文档，再次下载不重复扣费

3、资料包下载后请先用软件解压，在使用对应软件打开

光纤光栅于地震检波器方向的应用 Title:ApplicationofFiberOpticGratinginSeismicSensors Introduction: EarthquakesarenaturalphenomenaassociatedwiththeshiftingandshakingoftheEarth'scrust.Monitoringandanalyzingseismicactivityarecrucialforunderstandingthebehaviorofearthquakes,assessingstructuralvulnerabilities,anddevelopingeffectiveearlywarningsystems.Overtheyears,variousdetectiontechnologieshavebeenemployedtomeasureseismicwavesaccurately.Onesuchtechnologythathasshowngreatpotentialistheuseoffiberopticgratingsinseismicsensors.Thispaperaimstoexploretheapplicationoffiberopticgratingsinseismicsensors,itsadvantages,challenges,andpotentialfutureimprovements. 1.FiberOpticGratingTechnology: 1.1PrincipleofFiberOpticGrating: Fiberopticgratingsaredevicesconstructedbycreatingaperiodicvariationintherefractiveindexofanopticalfibercore.Therefractiveindexmodulationinteractswithincidentlight,causingreflectionortransmissioninspecificwavelengthranges,facilitatingtheanalysisoflightproperties.Thegrating'speriodicitycanbefabricatedthroughdifferenttechniqueslikeholographiclithographyorUVlaserexposure,enablingthegratingtoserveasawavelength-selectivefilter. 1.2TypesofFiberOpticGratings: (a)BraggGratings:Thesearethemostcommonlyusedfiberopticgratingsinseismicsensors.Theyreflectspecificwavelengthsoflightbasedonthegrating'speriodicity,makingthemidealformeasuringstrainorstresschangesinthefiber. (b)Long-PeriodGratings(LPGs):LPGsdiffractspecificwavelengthsoflightduetoachangeinrefractiveindexcausedbyinducingaperiodicvariationinthefiber'scorediameter.LPGsareparticularlyvaluableformeasuringtemperaturechanges. 2.ApplicationofFiberOpticGratingsinSeismicSensors: 2.1SeismicWaveDetection: Fiberopticgratingscanbeembeddedinthevicinityofstructuresorwithinthegroundforreal-timemeasurementandmonitoringofseismicwaves.Asseismicwavespassthroughthefiber,strain-inducedchangesoccur,alteringthegrating'sreflectedwavelengths.Bymeasuringtheshiftinthesewavelengths,itispossibletoanalyzetheintensity,frequency,anddirectionoftheseismicwaves,providi