光纤光栅空分光复用传感系统的研究
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摘要
介绍了一种光纤光栅空分复用传感系统,并将光纤光栅的传感特性应用于结构健康检测系统中。宽带光源发出的光波进入光栅阵列时,利用光开关选通不同光路实现FBG空分复用传感系统。系统采用等腰三角形悬臂梁调谐装置对FBG进行挠度加载,利用非平衡M-Z干涉技术对传感信息进行解调,将包含被测应变信息的FBG波长信号转变成相位信号,从而得到被测应变的大小,成功地实现了空分复用传感。该系统可用于静态应变和动态应变的检测,具有高分辨力、大测量范围的特点,其传感分辨率为7.3 nε,灵敏度的实验值为0.82°/με。
Controlled by an optical switch,a fiber Bragg grating sensing system based on spatial division multiplexing is developed under a broad-band source illumination.With an isosceles triangle cantilever beam to realize linear tuning of Bragg wavelength of fiber grating without chirping,the system employs an unbalanced Mach-Zehnder interferometer to translate the FBG wavelength signal into phase signal.The strain can be recovered by measuring the phase change with signal processing circuit.With a high resolution characteristic and wide measurement range,this sensor system has the capability of measuring static strain as well as dynamic strain.Experiment demonstrates that the sensing sensitivity of this system is resolution of 7.3/με,and experimental sensitivity of 0.82°/με.
Controlled by an optical switch,a fiber Bragg grating sensing system based on spatial division multiplexing is developed under a broad-band source illumination.With an isosceles triangle cantilever beam to realize linear tuning of Bragg wavelength of fiber grating without chirping,the system employs an unbalanced Mach-Zehnder interferometer to translate the FBG wavelength signal into phase signal.The strain can be recovered by measuring the phase change with signal processing circuit.With a high resolution characteristic and wide measurement range,this sensor system has the capability of measuring static strain as well as dynamic strain.Experiment demonstrates that the sensing sensitivity of this system is resolution of 7.3/με,and experimental sensitivity of 0.82°/με.
引文
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[3]钱晋武,孙流川,沈林勇,等.非开挖地下管线探测中的弯曲变形检测装置研究[J].光学精密工程,2005,13(2):179-184.QIAN J W,SUN L CH,SHEN L Y,et al..On sensing apparatus for bending deformation in trenchless undergroundpipeline detection[J].Opt.Precision Eng.,2005,13(2):179-184.(in Chinese)
[4]桑新柱,余重秀,颜玢玢,等.基于光纤布拉格光栅的化学传感器[J].光学精密工程,2006,14(5):771-774.SANG X ZH,YU CH X,YAN B B,et al..Chemical sensor based on a fiber Bragg grating[J].Opt.PrecisionEng.,2006,14(5):771-774.(in Chinese)
[5]RAO Y J,KALLI K,BRADY G,et al..Spatially-multiplexed fiber-optic Bragg grating strain and temperature sen-sor system based on interferometric wavelength-shift detection[J].Electron.Lett.,1995,31:1009.
[6]余永龙,谭华耀.有源波、空分复用光纤光栅传感网络[J].中国激光.2002,29(2):131-134.YU Y L,TAN H Y.Active spatial/wavelength-division multiplexed fiber Bragg grating[J].Chin.J.Laser,2002,29(2):131-134.(in Chinese)
[7]张燕君,陈才和,吴波,等.硅微光机械加速度地震检波器中M-Z光波导干涉仪结构设计[J].光学精密工程,2006,14(1):77-82.ZHANG Y J,CH C H,WU B,et al..Structure design of Mach-Zehnder interferometer in electrooptic integrated ac-celeration seismic geophone[J].Opt.Precision Eng.,2006,14(1):77-82.(in Chinese)
[8]江毅,陈伟民,杨礼成,等.光纤光栅用于应变/温度传感初探[J].传感技术学报,1997,9(3):43-47.JIANG Y,CHEN W M,YANG L C,et al..The investigation on strain/temperature sensor based on optic-fibregrating[J].Chin.J.Sensor Actuator.1997,9(3):43-47.(in Chinese)
[9]KERSEY A D.A review of recent developments in optic sensor technology[J].Opt.Fiber Technol.,1996,2:291-317.
[10]CHANG L W,LEE C T.Displacement measurement by synthesized light source based on fiber Bragg gratings[J].Opt.Commu.,1998,154:261-267.
[11]HO H L,JIN W,CHAN C.A fiber Bragg grating sensor for static and dynamic measurement[J].Sensor ActuatorA,2002,96:21-24.
[12]张涛,孙立宁,蔡鹤皋.压电陶瓷基本特性研究[J].光学精密工程,1998,6(5):26-32.ZHANG T,SUN L N,CAI H G.Study on the fundamental characteristics of piezoelectric element[J].Opt.Preci-sion Eng.,1998,6(5):26-32.(in Chinese)
[13]余永龙,谭华耀,锺永康.基于干涉解调技术的光纤光栅传感系统[J].光学学报.2001,21(8):987-989.YU Y L,TAN H Y,CHUNG Y H.A fiber Bragg grating sensor system with interferometric demodulation tech-nique[J].Acta Optica Sinica,2001,21(8):987-989.(in Chinese)
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