一种基于电光晶体材料包层的新型光纤布拉格光栅传感器
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摘要
设计了一种包层为单轴晶体LiTaO_3的新型光纤布拉格光栅传感器,将一个布拉格光栅分成两半,仅在其中的一半包层上施加电场,另一半保持不变,应用耦合模理论和电光效应原理研究了有外加电场时的传感性能.研究结果表明,由于包层材料的电光效应,布拉格反射峰将由初始的一个分裂成两个,分别对温度和电场敏感.其中无外加电场的一半光栅的温度灵敏度为14.31pm/℃,与之对应的布拉格波长漂移只与温度有关;当电场强度从0v/m增加到400×107 v/m时,有电场的一半光栅的温度灵敏度从14.31pm/℃降低到14.13pm/℃,与之对应的布拉格波长漂移不仅与温度有关,还受到电场强度的影响.因此,应用该传感器可分辨出温度和电场强度所引起的布拉格波长漂移,从而实现了温度和电场的同时测量,尤其在高电压领域具有潜在的应用价值.
A novel Bragg photo-fiber grating(FBG)sensor with cladding of uniaxial crystal LiTaO_3 was designed,where the Bragg grating was separated into two halves,and the electric field was applied to only one of them.The transducing performance under external electrical field was investigated by the coupledmode theory and the electron-optic effect principle.The results showed that due to the electron-optic effect of the cladding material,the initial single Bragg reflection peak would split into two reflection peaks which were sensitive to temperature and electric field respectively.The temperature sensitivity of one half of the transducer without electric field will be 14.31 pm/℃ and its corresponding Bragg wavelength shift would only depend on the temperature.If the electric field increased from 0 v/m to 400×107 v/m,the temperature sensitivity of the other half would drop from 14.31 pm/℃to 14.13 pm/℃and its corresponding Bragg wavelength shift would depend on not only the temperature but also the electric field strength.As a result the Bragg wavelength shift caused by temperature and electric field could be distinguished by this sensor,and the measurement of temperature and electric field could be implemented simultaneously.This work has a potential application in the field of high-voltage techniques.
A novel Bragg photo-fiber grating(FBG)sensor with cladding of uniaxial crystal LiTaO_3 was designed,where the Bragg grating was separated into two halves,and the electric field was applied to only one of them.The transducing performance under external electrical field was investigated by the coupledmode theory and the electron-optic effect principle.The results showed that due to the electron-optic effect of the cladding material,the initial single Bragg reflection peak would split into two reflection peaks which were sensitive to temperature and electric field respectively.The temperature sensitivity of one half of the transducer without electric field will be 14.31 pm/℃ and its corresponding Bragg wavelength shift would only depend on the temperature.If the electric field increased from 0 v/m to 400×107 v/m,the temperature sensitivity of the other half would drop from 14.31 pm/℃to 14.13 pm/℃and its corresponding Bragg wavelength shift would depend on not only the temperature but also the electric field strength.As a result the Bragg wavelength shift caused by temperature and electric field could be distinguished by this sensor,and the measurement of temperature and electric field could be implemented simultaneously.This work has a potential application in the field of high-voltage techniques.
引文
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[3]SHU X,ZHAO D,ZHANG L,et al.Use of dual-grating sensors formed by different types of fiber Bragg gratings for simultaneous temperature and strain measurements[J].Applied optics,2004,43(10):2006-2012.
[4]LIN G R,LIU C C,FU M Y,et al.A dual-parameter sensor based on a no-core fiber and fiber Bragg grating[J].Optical Engineering,2014,53(5):1061-1063.
[5]ZHULIN Z,ZHENKUN Y,HUIHUA W,et al.Temperature and Strain-Sensed Researches of Double Fiber Bragg Gratings[J].Journal Xi’an Jiaotong University,2004,38(6):607-610.
[6]LI K,ZHOU Z.A high sensitive fiber Bragg grating strain sensor with automatic temperature compensation[J].Chinese Optics Letters,2009,7(3):191-193.
[7]ZHAO M F,WANG N,LUO B B,et al.Simultaneous measurement of temperature and concentration of sugar solution based on hybrid fiber grating sensor[J].Chinese Optics,2014,7(3):476-482.
[8]张晓萍,谭志红.各向异性内包层对双包层光纤特性影响的分析[J].光学学报,2002,22(8):927-932.
[9]侯尚林,李鸿伯,黎锁平,等.各向异性材料包层光纤Bragg光栅的反射谱[J].量子电子学报,2008,25(5):625-629.
[10]STEVENSON J L,DYOTT R B.Optical-fibrer waveguide with a single-crystal core[J].Electronics Letters,1974,10(22):449-450.
[11]COZENS J R.Propagation in cylindrical fibres with anisotropic crystal cores[J].Electronics Letters,1976,12(16):413-415.
[12]WAKAKI M,KOMACHI Y,MACHIDA H,et al.Fiber-optic polarizer using birefringent crystal as a cladding[J].Applied optics,1996,35(15):2591-2594.
[13]LU D,ZHANG X.Theoretical study on electrooptic effect and elasto-optic effect in chirped fiber grating with uniaxial crystal cladding[J].Guangxue Xuebao(Acta Optica Sinica),2005,25(8):1025-1029.
[14]LI L J,MA H,ZHANG Y L,et al.Simulation of reflection spectrum of FBG with uniaxial anisotropic crystal cladding[J].Acta Physica Sinica,2012,61(13):165-172.
[15]侯尚林,尚云博,黎锁平,等.均匀光纤Bragg光栅的慢光特性[J].兰州理工大学学报,2011,37(5):96-99.
[16]KOGELNIK H.Theory of optical waveguides[M].Berlin Heidelberg:Springer,1988:7-88.
[17]ERDOGAN T.Fiber grating spectra[J].Journal of lightwave technology,1997,15(8):1277-1294.
[18]石顺祥.物理光学与应用光学[M].西安:西安电子科技大学出版社,2000.
[19]阿戈沃.非线性光纤光学原理及应用[M].北京:电子工业出版社,2010.
[20]李永刚.PDMS微流控芯片关键工艺技术研究[D].长春:中国科学院光学精密机械与物理研究所,2006.