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斜面透镜光纤在反射式光纤位移传感器中的应用（英文）.docx

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斜面透镜光纤在反射式光纤位移传感器中的应用（英文） ApplicationofInclined-PlaneLensFiberOpticsinReflectiveFiberOpticDisplacementSensors Introduction Fiberopticdisplacementsensorsarewidelyusedinthefieldsofautomation,robotics,andstructuralhealthmonitoringduetotheirhighsensitivity,smallsize,andimmunitytoelectromagneticinterference.Amongvarioustypesofopticalfiberssensors,reflectivefiberopticdisplacementsensorshavegainedincreasinginterestbecauseoftheirsimplestructure,highprecision,andsuitabilityforharshenvironments.Thekeycomponentofareflectivefiberopticdisplacementsensoristheinclined-planelensfiberoptics,whichplaysanimportantroleinthemeasurementaccuracyandstability.Inthispaper,wereviewtheprinciple,design,andapplicationsofinclined-planelensfiberopticsinreflectivefiberopticdisplacementsensors. PrincipleofInclined-PlaneLensFiberOptics Theinclined-planelensfiberoptics(IPLFO)isakindofopticalpathbendingdevice,whichcantransferthelightbeambetweentwofiberswithacertainangledeviation.Theangledeviationisintroducedbyatiltedflatsurface,whichformsaninclinedplanethatintersectswiththefibers'axes.TheIPLFOisbasedontheprincipleofrefractionandreflectionoflight.WhenalightbeamenterstheIPLFO,itisrefractedandreflectedattheinclinedplane,resultinginachangeinthebeamdirectionandashiftinthebeam'sfocus.Byadjustingtheinclinationangleoftheflatsurface,thedeviationangleandthefocallengthoftheIPLFOcanbeoptimizedtoachievemaximumlighttransmissionefficiencyanddesirableopticalpathlength. DesignofInclined-PlaneLensFiberOptics ThedesignofIPLFOdependsonthespecificapplicationrequirements.TherearetwotypicaldesignsofIPLFO,namely,axialandlateralIPLFOs.TheaxialIPLFOisasimplestructure,whichisformedbydirectlypolishingtheendfaceofasingle-modefiberataninclinedangle.ThelateralIPLFOisamorecomplicatedstructure,whichconsistsoftwofibers,athinfilmcoating,andaprism.ThelateralIPLFOcanachievelargerangledeviationandlongerfocallengththantheaxialIPLFO.Besides,thelateralIPLFOcanbedesignedwithdifferentconfigurations,suchassymmetricalandanti-symmetric,tomeetdiffe