双光栅π相位差温度不敏感加速度传感技术研究
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摘要
提出了一种基于π相位温度不敏感的双光纤布拉格光栅加速度传感技术,并设计了双光栅加速度传感器,对该传感器的温度特性和加速度对中心波长的响应进行了研究。给出了该传感器的结构及封装方法。从理论上分析了基于π相位温度不敏感的双光纤布拉格光栅加速度传感原理,分析了温度和加速度对波长的响应关系,推导了该光栅加速度传感器的响应灵敏度的解析表达式。通过实验分析双光栅的加速度响应和平坦区。实验结果表明,在温度比较宽的范围内,可实现温度不敏感加速度的准确测量,加速度响应灵敏度为15.52 pm/(m.s-2),实验值与理论值的相对误差为3.06%,加速度与波长具有较好的线性关系,线性度为99.8%,在小于共振频率的低频段具有较好的平坦区。表明该双光纤布拉格光栅加速度传感器具有温度不敏感特性,能实现低频加速度的准确测量。
A novel temperature-independent technology based on π phase of double fiber Bragg grating(FBG) acceleration is proposed.The double fiber Bragg grating accelerometer is designed.The temperature response and acceleration response of the sensor versus wavelength are researched.The configuration and coating of the accelerometer are designed.The temperature-independent principle based on π phase of double fiber Bragg grating accelerometer is analyzed.The temperature response of FBGs and the acceleration response versus wavelength are analyzed.And the analytical formula of acceleration sensitivity is also deduced.Acceleration response and flat range of the accelerometer are analyzed by experiment.Experimental results indicate that precise measurement can be realized in the large range of temperature,and the sensitivity is 15.52 pm/(m·s-2),relative error is 3.06%.The sensor demonstrates extremely linear response,and linear fitting is 99.8%.There is a good flat response at frequencies less than the mechanical resonance frequency,which indicates that the accelerometer has good temperature-independent characteristic and can realize precise measurement.
A novel temperature-independent technology based on π phase of double fiber Bragg grating(FBG) acceleration is proposed.The double fiber Bragg grating accelerometer is designed.The temperature response and acceleration response of the sensor versus wavelength are researched.The configuration and coating of the accelerometer are designed.The temperature-independent principle based on π phase of double fiber Bragg grating accelerometer is analyzed.The temperature response of FBGs and the acceleration response versus wavelength are analyzed.And the analytical formula of acceleration sensitivity is also deduced.Acceleration response and flat range of the accelerometer are analyzed by experiment.Experimental results indicate that precise measurement can be realized in the large range of temperature,and the sensitivity is 15.52 pm/(m·s-2),relative error is 3.06%.The sensor demonstrates extremely linear response,and linear fitting is 99.8%.There is a good flat response at frequencies less than the mechanical resonance frequency,which indicates that the accelerometer has good temperature-independent characteristic and can realize precise measurement.
引文
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2 Yu Dakuan,Qiao Xueguang,Jia Zhen′anet al..The fiber Bragggrating temperature and pressure sensing system applied in oilpipeline[J].Laser Technology,2007,31(1):12~14禹大宽,乔学光,贾振安等.应用在油气管线的光纤光栅温度压力传感系统[J].激光技术,2007,31(1):12~14
3 Wang Yubao,Lan Haijun.Study of fiber Bragg grating sensorsystem based on wavelength-division multiplexing/time-divisionmultiplexing[J].Acta Optica Sinica,2010,30(8):2196~2201王玉宝,兰海军.基于光纤布拉格光栅波/时分复用传感网络研究[J].光学学报,2010,30(8):2196~2201
4 Wang Jing,Feng Dejun,Sui Qingmeiet al..Study of optical-fiber Bragg grating seepage pressure sensor based on draw-barstructure[J].Acta Optica Sinica,2010,30(3):686~691王静,冯德军,隋青美等.基于拉杆结构的光纤布拉格光栅渗压传感器研究[J].光学学报,2010,30(3):686~691
5 Y.N.Zhu,P.Shum,C.Luet al..Temperature-insensitivefiber Bragg grating accelerometer[J].IEEE Photon.Technol.Lett.,2003,15(10):1437~1439
6 R.Romero,O.Fraz o,D.A.Pereiraet al..Intensity-referenced and temperature-in dependent curvature-sensingconcept based on chirped fiber Bragg gratings[J].Appl.Opt.,2005,44(18):3821~3826
7 T.K.Gangopadhyay.Prospects for fiber Bragg gratings andFabry-Perot interferometers in fiber-optic vibration sensing[J].Sens.Actuators A.Phys.,2004,113(1):20~38
8 A.Fender,W.N.Macpherson,R.R.J.Maieret al..Two-axis temperature-insensitive accelerometer based on multicorefiber Bragg gratings[J].IEEE Sens.,2008,8(7):1292~1298
9 T.Guo,L.Shao,H.Tamet al..Tilted fiber gratingaccelerometer incorporating an abrupt biconical taper for claddingto core recouping[J].Opt.Express.,2009,17(9):20651~20660
10 Qiao Xueguang,Ding Feng,Jia Zhen′anet al..High precisionoptical fiber Bragg grating demodulation system based on thesource filtering for seismic detection[J].Acta Optica Sinica,2010,30(8):2219~2223乔学光,丁锋,贾振安等.基于光源滤波的高精度光纤光栅地震检波解调系统[J].光学学报,2010,30(8):2219~2223
11 Guo Tuan,Zhao Qida,Liu Lihuiet al..Light intensity referredand temperature insensitive fiber Bragg grating dynamic pressuresensor[J].Acta Optica Sinica,2007,27(2):207~211郭团,赵启大,刘丽辉等.光强检测型光纤光栅温变不敏感动态压力传感研究[J].光学学报,2007,27(2):207~211
12 Lan Li,Xinyong Dong,Wenjun Zhouet al..Temperature-independent accelerometer with a strain-chirped fiber Bragggrating[C].OSA/ACP.2009,TUEFF7
13 Guo Tuan,Liu Bo,Zhang Weiganget al..Research on opticalfiber grating chirp-sensing technology[J].Acta Optica Sinica,2008,28(5):828~834郭团,刘波,张伟刚等.光纤光栅啁啾化传感研究[J].光学学报,2008,28(5):828~834
14 S.R.K.Morikawa,A.S.Ribeiro,R.D.Regazziet al..Triaxial Bragg grating accelerometer[C].Optical Fiber SensorsConference Technical Digestions,2002,11(15):95~98
15 Cai Haichong,Min Xing.Mechanics of Materials[M].Xi′an:Xi′an Jiaotong University Press,2004.7~296蔡怀崇,闵行.材料力学[M].西安:西安交通大学出版社,2004.7~296
16 W.W.Morey,G.Meltz,W.H.Glenn.Fiber optic Bragggrating sensors[C].SPIE,1989,1169:98~107
17 A.D.Kersey,M.A.Davis,H.J.Patricket al..Fiber gratingsensors[J].J.Lightwave Technol.,1997,15(8):1442~1463
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