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1、光纤Bragg光栅温度和应变传感特性的试验研究2008正第11期仪表技术与传感器InstrumentTechniqueandSensor2008No.11光纤Bragg光栅温度和应变传感特性的试验研究郑卜祥,宋永伦(1.北京工业大学机械工程与应用电子技术学院,北京,张东生,吴安,姜德生100124;2.武汉理工大学光纤传感技术中心,湖北武汉430070)摘要:在光纤Bragg光栅传感原理的理论分析基础上,采用保温装置和等强梁结构对其温度和应变传感特性进行了试验研究,并做了试验结果的误差分析.其结果表明
2、光纤光栅的Bragg波长随温度和轴向应变的变化呈现出良好的线性关系,且重复性较好.试验测得的温度灵敏系数升温时约为9.54pm/~C,降温时约为9.53pm/%,理论计算值约为9.72prrd%;应变灵敏系数加栽时约为1.006pm/p~e,卸载时约为1.005prn/&~,理论计算值约为1.O11pro/%;其试验值与理论计算值吻合得很好.同时介绍了一种简单实用的温度补偿技术,得出了考虑温度补偿后的实际应变与光栅波长的关系式,并采用焊接应力在线监测试验对其温度和应变传感特性的标定值进行了验证
3、,为光纤Bragg光栅在铝合金工程结构中进行温度和应变监测提供了理论依据和试验数据,对光纤Bragg光栅传感测量的工程应用具有借鉴作用和重要意义.关键词:光纤Bragg光栅;温度;应变;光纤传感器;温度补偿中图分类号:TN247;TP212;TN253文献标识码:A文章编号:1002—1841(2008)11—0012—04ExperimentalStudy0nTemperatureandStrainSensingCharacteristicsofFiberBraggGratingZHENGBu—xi
4、ang,SONGYong—lun',ZHANGDong—sheng,WUAn,JIANGDe—shengz(1.CollegeofMechanicalEngineeringandAppHedElectronicsTechnology,BeijingUniversityofTechnology,Beijing100124,China;2.OpticalFiberSensingTechnologyResearchCenter,WuhanUniversityofTechnology,Wuhan430070,
5、China)Abstract:OnthebasisofthetheoreticalanalysisoffiberBragggrating(FBG)sensingprinciple,temperatureandstrainsensingcharacteristicswereinvestigatedbyattemperatorandisodynamicintensitybeamstructure,andtheerroroftheexperimentalresultswereanalyzed.Theresu
6、ltsofexperimentindicatethatthereisagoodlinearvariationrelationshipbetweenthewavelengthofFBGandtemper-atureoraxialstrain,andwithagoodrepeatability.Theexperimentalvalueoftemperaturesensitivitycoefficientisabout9.54pm/~Catcalefaction,andcoolingataround9.53
7、pm/~C,thetheoreticalvalueofthatisabout9.72pm/~C.Theexperimentalvalueofstrainsen?sitivitycoefficientisabout1.006pm/t~satloadingand1.1305pm/l~eatunloading,thetheoreticalvalueofthatisabout1.011pm/p~e.Theexperimentalandtheoreticalvaluesmatchwel1.Meanwhile,a
8、simpleandpracticaltemperaturecompensationtechnologyWaSintro-duced,therelationshipbetweenthewavelengthofFBGandtheactualstrainofconsideringtemperaturecompensationWaSobtained.Andtemperatureandstrainsensingcharacteristicsofcalibratio
