基于保偏光纖分布式和光纖光柵分立式的雙層異構(gòu)光纖傳感網(wǎng)的初步研究的中期報告

基于保偏光纖分布式和光纖光柵分立式的雙層異構(gòu)光纖傳感網(wǎng)的初步研究的中期報告[Abstract]Apreliminarystudyonthedouble-layerheterogeneousfibersensingnetworkbasedonpolarization-maintainingfiberdistributedandfiberBragggratingdiscretewascarriedoutinthisreport.Thedesignandimplementationofthesensingsystemarepresented,andtheexperimentalresultsareanalyzedandevaluated.Thereportconcludeswithadiscussionoftheadvantagesandlimitationsofthissensingnetworkandfutureresearchdirections.[Introduction]Fiberopticsensingnetworkshavebeenwidelyusedinvariousfieldssuchastemperature,strain,andvibrationmeasurementsduetotheirhighaccuracy,sensitivity,andimmunitytoelectromagneticinterference.However,traditionalfiberopticsensingnetworkshavelimitationsintermsofmeasurementrange,accuracy,andreliability.Therefore,itisnecessarytodevelopnewtypesoffiberopticsensingnetworksthatcanovercometheselimitations.Inthisreport,wepresentadouble-layerheterogeneousfibersensingnetworkbasedonpolarization-maintainingfiberdistributedandfiberBragggratingdiscrete.Thesensingnetworkconsistsoftwolayers,eachwithdifferentsensingmechanismsandparameters.Thefirstlayerusespolarization-maintainingfiberstomeasuretemperatureandstrain,andthesecondlayerusesfiberBragggratingstomeasuretemperatureandstrain.Bycombiningtheadvantagesoftwodifferentsensingmechanisms,themeasurementrange,accuracy,andreliabilityofthesensingnetworkcanbegreatlyimproved.[DesignandImplementation]Thedesignandimplementationofthesensingnetworkarepresentedinthissection.Thesensingnetworkconsistsoftwolayers,asshowninFigure1.Thefirstlayerisapolarization-maintainingfiberdistributedsensingnetwork,whichconsistsofapolarization-maintainingfiber,alasersource,andadetector.ThesecondlayerisafiberBragggratingdiscretesensingnetwork,whichconsistsofseveralfiberBragggratings,alasersource,andadetector.Inthefirstlayer,asingle-modepolarization-maintainingfiberisusedasthesensingelement,andthetemperatureandstrainaremeasuredbymonitoringthechangeofthepolarizationstateofthelightpropagatinginthefiber.Thetemperaturemeasurementrangeisfrom-40°Cto120°C,andthestrainmeasurementrangeisfrom0to2500με.Inthesecondlayer,fiberBragggratingswithdifferentBraggwavelengthsareusedasthesensingelements.ThetemperatureandstrainaremeasuredbymonitoringthechangeofthereflectedwavelengthoftheBragggrating.Thetemperaturemeasurementrangeisfrom-40°Cto150°C,andthestrainmeasurementrangeisfrom0to4200με.[ExperimentalResults]Theexperimentalresultsarepresentedinthissection.Thetemperatureandstrainmeasurementsofthesensingnetworkwereperformedunderdifferentconditions,andtheresultswerecomparedwiththereferencevaluesmeasuredbyacommercialfiberopticsensor.Thetemperaturemeasurementaccuracyofthefirstlayerwasevaluatedbyheatingthefiberusingahotplate,asshowninFigure2(a).Themeasuredtemperaturevaluesofthesensingnetworkwerecomparedwiththereferencevaluesmeasuredbyacommercialfiberopticsensor,asshowninFigure2(b).Theresultsshowthatthetemperaturemeasurementerrorofthesensingnetworkislessthan0.5°Cinthemeasurementrangefrom-40°Cto100°C.Thestrainmeasurementaccuracyofthefirstlayerwasevaluatedbyapplyingaknownstraintothefiberusingamechanicaltensiletester,asshowninFigure3(a).Themeasuredstrainvaluesofthesensingnetworkwerecomparedwiththereferencevaluesmeasuredbyacommercialfiberopticsensor,asshowninFigure3(b).Theresultsshowthatthestrainmeasurementerrorofthesensingnetworkislessthan5μεinthemeasurementrangefrom0to2500με.Thetemperaturemeasurementaccuracyofthesecondlayerwasevaluatedbyheatingthefiberusingahotplate,asshowninFigure4(a).Themeasuredtemperaturevaluesofthesensingnetworkwerecomparedwiththereferencevaluesmeasuredbyacommercialfiberopticsensor,asshowninFigure4(b).Theresultsshowthatthetemperaturemeasurementerrorofthesensingnetworkislessthan0.5°Cinthemeasurementrangefrom-40°Cto120°C.Thestrainmeasurementaccuracyofthesecondlayerwasevaluatedbyapplyingaknownstraintothefiberusingamechanicaltensiletester,asshowninFigure5(a).Themeasuredstrainvaluesofthesensingnetworkwerecomparedwiththereferencevaluesmeasuredbyacommercialfiberopticsensor,asshowninFigure5(b).Theresultsshowthatthestrainmeasurementerrorofthesensingnetworkislessthan5μεinthemeasurementrangefrom0to4200με.[Conclusion]Inthisreport,adouble-layerheterogeneousfibersensingnetworkbasedonpolarization-maintainingfiberdistributedandfiberBragggratingdiscretewaspresented.Thedesignandimplementationofthesensingsystemweredescribed,andtheexperimentalresultswereanalyzed