1997 In-fibre Bragg grating sensors

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1、Meas.Sci.Technol.8(1997)355–375.PrintedintheUKPII:S0957-0233(97)72999-0REVIEWARTICLEIn-fibreBragggratingsensorsYun-JiangRaoAppliedOpticsGroup,PhysicsDepartment,UniversityofKentatCanterbury,KentCT27NR,UKReceived12August1996,infinalform22October1996,acceptedforpublication21November1996Abstrac

2、t.In-fibreBragggrating(FBG)sensorsareoneofthemostexcitingdevelopmentsinthefieldofopticalfibresensorsinrecentyears.Comparedwithconventionalfibre-opticsensors,FBGsensorshaveanumberofdistinguishingadvantages.Significantprogresshasbeenmadeinapplicationstostrainandtemperaturemeasurements.FBGsensors

3、provetobeoneofthemostpromisingcandidatesforfibre-opticsmartstructures.ThisarticlepresentsacomprehensiveandsystematicoverviewofFBGsensortechnologyregardingmanyaspectsincludingsensingprinciples,properties,fabrication,interrogationandmultiplexingofFBGsensors.ItisanticipatedthatFBGsensorsystem

4、swillbecommercializedandwidelyappliedinpracticeinthenearfutureduetothematurityofeconomicalproductionofFBGsandtheavailabilityofcosteffectiveinterrogationandmultiplexingtechniques.Yun-JiangRaowasbornintheinterferencepatternproducedbyoppositelypropagat-Yunnan,China.Hereceivedingmodesofargon-

5、ionlaserradiationwasfirstreportedhisMEngandPhDdegreesin1978(Hilletal1978).However,pioneeringworkatinOptoelectronicsattheUni-theUnitedTechnologyResearchCentre,whichisregardedversityofChongqing,China,asamilestoneforin-fibreBragggrating(FBG)sensors,in1986and1990.In1988hewasemployedasalecturera

6、twaspublishedelevenyearslater(Meltzetal1989).ThistheUniversityofChongqing,side-writingtechniquecreatesaBragggratingdirectlyinwhereheledaresearchthefibrecoreusingaholographicinterferometerillumi-teamtodevelopthefirstnatedwithacoherentultravioletsource.Versatilityinthefullyautomaticsingle-mod

7、efabricationofFBGshasbeengainedfromthefactthatfibrearc-fusionsplicingma-chineinChina.From1991theBraggwavelengthisindependentofthewritinglaserto1992heworkedonall-used.SubsequenttothisinitialworkinterestinFBGshasfibreoptically-addressedsil-increasedconsiderablyinrecenty