两层镀膜长周期光纤光栅传感器的特性研究-豆柴文库

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两层镀膜长周期光纤光栅传感器的特性研究
Abstract:
Fiberopticgratingsensorshavegarneredsignificantattentioninvariousfieldsduetotheirhighsensitivity,compactsize,andimmunitytoelectromagneticinterference.Inthisstudy,weinvestigatethecharacteristicsofatwo-layer-coatedlong-periodfibergratingsensor.Thedouble-layercoatingapproachenhancesthesensor'sperformanceandimprovesitssensitivity.Weexperimentallydemonstratedtheenhancedsensitivityandstabilityofthesensoranddiscusseditspotentialapplicationsinvarioussensingdomains.
1.Introduction:
Fiberopticgratingsensorshavebecomeavitaltoolinthefieldofsensingduetotheiruniqueadvantagessuchasremotesensing,highsensitivity,immunitytoelectromagneticinterference,andcompactsize.Thelong-periodfibergrating(LPFG)isoneofthemostcommonlyusedfibergratingsensors.Itexhibitsastrongcouplingefficiencybetweentheforwardpropagatingcoremodeandbackwardpropagatingcladdingmodesataspecificcouplingwavelength.Bymeasuringtheshiftinthecouplingwavelength,variousmeasurandssuchastemperature,strain,pressure,andrefractiveindexcanbedetected.
2.Two-LayerCoatingApproach:
TheconventionalLPFGsensorsaretypicallyfabricatedwithoutanyadditionalcoatingonthefibersurface.However,theadditionofathinfilmorlayercansignificantlyimprovethesensor'sperformance.Inthisstudy,weinvestigateatwo-layercoatedLPFGsensor.Thedouble-layercoatingconsistsofahigh-refractive-indexouterlayerfollowedbyalowrefractive-indexinnerlayer.Thisconfigurationprovidesenhancedsensingproperties,includinghighersensitivity,increasedstability,andimprovedselectivity.
3.ExperimentalSetup:
TheexperimentalsetupinvolvesthefabricationoftheLPFGsensorusingaCO2laser-inducedperiodicheatingtechnique.ThefabricatedLPFGsensoristhencoatedwiththedouble-layercoatingusingadepositionprocess.Theouterhigh-refractive-indexlayerischosenbasedonitscompatibilitywiththemeasurandtomaximizethecouplingefficiency.Theinnerlow-refractive-indexlayeractsasaprotectivelayerandensuresstabilityandselectivity.
4.CharacterizationofTwo-LayerCoatedLPFGSensor:
Thefabricatedsensorischaracteri