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波长调制型光纤传感器及其应用.docx

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波长调制型光纤传感器及其应用 Abstract: Fiberopticsensorsarewidelyusedinavarietyofapplicationsduetotheirnumerousadvantagesoverconventionalsensors.Amongdifferenttypesoffiberopticsensors,wavelengthmodulation-basedsensorshavegainedsignificantattentionintherecentfewyearsbecauseoftheirhighsensitivity,fastresponse,andimmunitytoelectromagneticinterference.Thispaperpresentsadetaileddiscussiononthewavelengthmodulation-typefiberopticsensors,theirworkingprinciples,andapplications. Introduction: Fiberopticsensorsaretypicallydividedintotwocategories:intensitymodulation-basedandwavelengthmodulation-basedsensors.Intensitymodulation-basedsensorsrelyonthechangeinsignalintensityduetothechangeinsomeexternalparameter,whilewavelengthmodulation-basedsensorsutilizetheshiftinthewavelengthofthelightsignalduetotheperturbationscausedbythemeasurand.Wavelengthmodulation-basedfiberopticsensorsarepreferredovertheintensitymodulation-basedsensorsfortheirhighsensitivity,selectivity,fastresponse,andlowsusceptibilitytoelectromagneticinterference. WorkingPrinciples: Awavelengthmodulation-typefiberopticsensorcomprisesofalightsource,afiberopticcable,awavelengthmodulator,adetector,andsignalprocessingelectronics.Thelightsourcetypicallyemitsaspectralbandoflightthatistransmittedthroughthefiberopticcable.Thewavelengthmodulatoristypicallyadevicethatcanvarythewavelengthoflightbychangingtheopticalpathlength.Thedetectorreceivesthemodulatedlightsignalanddetectsthechangeinwavelength,whichisdirectlyproportionaltotheperturbation. Applications: Wavelengthmodulation-basedfiberopticsensorshavefoundmanyapplicationsinvariousareassuchasstructuralhealthmonitoring,temperaturesensing,strainsensing,pressuresensing,chemicalsensing,andbiomedicalsensing.Forinstance,instructuralhealthmonitoring,thesensorresponsecanbeusedtodetectthemechanicaldeformationorstructuraldamage.Similarly,intemperaturesensingapplications,thechangeintemperaturecanbedetectedbymonitoringthechangeinwavelengthofthelightsignal. Conclusion: Inconclusion,wavelengthmodulation-typ