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干涉型光纤传感器的PGC检测方法的分析与研究.docx

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干涉型光纤传感器的PGC检测方法的分析与研究 Title:AnalysisandResearchonPGCDetectionMethodsforInterferometricFiberOpticSensors Abstract: Fiberopticsensorsbasedontheprincipleofinterferometryhavegainedsignificantattentioninvariousindustriesduetotheiraccurateandreliablemeasurementcapabilities.Amongvariousinterferometricdetectionschemes,phase-generatedcarrier(PGC)isawidelyadoptedtechniqueforitssimplicityandeffectivenessinsignaldemodulation.ThispaperaimstoanalyzeandexploredifferentPGCdetectionmethodsusedininterferometricfiberopticsensors.Theanalysisincludesprinciples,advantages,andlimitationsofeachmethod,aswellastheirapplicationscenarios.Furthermore,thepaperdiscussespotentialareasofimprovementandfuturetrendsinPGCdetectiontechniques. 1.Introduction Interferometricfiberopticsensorsutilizetheinterferencephenomenonoflightwavestomeasureavarietyofphysicalparameters.PGCdetectionmethodiscommonlyusedinthesesensorsduetoitsadvantagesofhighsensitivity,largedynamicrange,andlownoise.ThispaperpresentsacomprehensiveanalysisoffourPGCdetectionmethods:synchronousdetection,digitalcarriergeneration,frequencymodulation,andopticalinterference. 2.SynchronousDetection SynchronousdetectionisatraditionalPGCdetectionmethod,wheretheinterferometricsignalismixedwithareferencesignalatthesamefrequency.Themixedsignalisthenpassedthroughalow-passfiltertoextractthedemodulatedsignal.Thismethodissimpleandwidelyusedinpracticalapplications.However,itrequirescarefulsynchronizationbetweenthereferenceandinterferometricsignalsandmayintroducephasedelay. 3.DigitalCarrierGeneration DigitalcarriergenerationisanadvancedPGCdetectionmethodthatusesdigitalsignalprocessingtechniquestogenerateacarriersignalinthedigitaldomain.Thiseliminatestheneedforanexternalreferencesignalandprovidesaccuratecarrierdemodulation.Digitalcarriergenerationcanbeimplementedusingvariousalgorithms,suchasFouriertransform,Hilberttransform,andcomplexwavelettransform.Thismethodoffersincreasedflexibilityandaccuracybutrequiressignificantcomputationalresources. 4.FrequencyModula