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1、FiberBragggratingtemperaturesensor－AreviewAbstract:Inrecentyears,considerableprogresshasbeenmadeinopticalfibersensorsusingafiberBragggrating(FBG).ThisisbecausesuchFBGsensorshavemanyadvantagesforpracticalapplications:easeofmultiplexedoperation,compactness,quasi-poin
2、tsensingcapabilityandsimplestructure.FiberBragggratings(FBG)havegeneratedmuchinterestforuseassensorsforstrain,temperature,andotherphysicalquantitiesbecauseoftheirimportantpropertiessuchasimmunitytoelectromagneticnoise,highsensitivity,compactness,andsimplicityoffabr
3、ication.OCIScodes:(060.2370)Fiberopticssensors;(230.1480)Braggreflectors.1.IntroductionFiberBragggrating(FBG)hasbeenintensivelystudiedanddevelopedasanopticalsensorforvarioussensingapplications,suchashealthmonitoringofcivilstructure,non-destructivetestingofcomposite
4、materials,smartstructure,andtraditionalstain,pressure,andtemperaturesensing[1].Torealizepracticalsensorsystemswithmultiplexingcapability,variouskindsofFBGarrayinterrogationtechniqueshavebeensuggested[2].Recently,thedemandforwarningtheabnormaltemperatureincreaseatre
5、strictedspaceshasbeenrapidlyincreasing.Inparticular,duetodifferenttolerablethresholdsrequiredatdifferentlocations,itisnecessarytoconstructthelowcostandeasyinterrogationconfiguration.Inthisletter,anovelmulti-pointtemperaturewarningsensorusingamulti-channelmatchedFBG
6、-basedmulti-wavelengthpulsedlaserisproposedanddemonstrated.Thesensorhasseveraladvantages,includingflexiblesettingofthetolerabletemperature,simplestructure,highsignal-to-noiseratio,lowsystemcostandquickresponse.2.Background（1）IntracorefiberBragggratingsforstrainmeas
7、urementinembeddedcompositestructuresTheBraggwavelengthisgivenby,(1)whereistheeffectiverefractiveindexofthefiber(modalindex)andListheBragggratingperiod.WeobtaintheBraggwavelengthshiftinthetemperaturesensorbydifferentiatingEq.(1)withrespecttotemperature:,(2)ForabareF
8、BG,withtemperaturevariation,thesecondtermontheright-handsideofEq.(2)isnegligiblebecausethethermallyinducedfiberelongationeffect()ismuchsmallertha
