【作者】 毕中广；

【导师】 熊燕玲；

【作者基本信息】 哈尔滨理工大学 ， 光学工程， 2009， 硕士

【摘要】 光纤布拉格光栅(FBG)是近几年来发展最为迅速的光纤无源器件之一,由于它的许多独特优点,在光纤通信、光纤传感领域具有广阔的应用前景。光纤光栅作为传感元件的突出优点是可以通过复用技术构成分布式传感网络,实现多点测量。因此光纤光栅的解调及复用技术成为当前国内外研究的热点。本文分析了FBG的应变及温度传感机理,概括介绍了几种常见的光纤光栅的解调及复用技术,在理论上给出了以可调谐F-P滤波技术和光频域反射(OFDR)复用技术相结合构成分布式FBG传感网络的具体方案。本文以Micron Optics研制的光纤F-P可调谐滤波器为核心元件,构建了基于可调谐F-P滤波器的解调装置,由三角波发生器、压控振荡器(VCO)、光强度调制器、乘法器以及频谱分析仪等构成了OFDR复用装置,用微动平台和电热恒温热水槽来模拟外界的应变和温度信号,进行了FBG应变和温度解调试验,完成了对3×3的FBG传感矩阵的地址查询工作,实现了FBG的分布式测量。并给出了基于OFDR复用的光纤光栅传感系统的温度补偿方案,以减小外界温度对传感系统的影响。为了提高系统的智能化程度及测量精度给出了系统的改进型方案。更多还原

【Abstract】 Fiber Bragg grating(FBG) is a new type of passive optical components which has been developed quickly in recently years. It has been greatly applied in optical fiber communication and optical sensors for its unique merit. As a sensing element, Fiber grating’s distinguished advantage is that it can realize distributed sensing by the multiplex techniques, therefore, lots of researchers are interested in fiber grating sensing demodulation and multiplex techniques.In this dissertation, we analyze the strain and temperature sensing principle of FBG, generally introduce several demodulation and multiplex techniques of fiber grating, a distributed FBG sensing network system that combines tunable F-P filter and optical frequency domain reflectometry (OFDR) is put forward.We construct a demodulator using fiber tunable F-P filter as a core element, make-up a OFDR multiplex system which is consist of triangle generator, voltage controlled oscillator(VCO), light intensity modulator, multiplier and frequency analyzer. Micro-active instrument and electric-heated thermostatic tanker are used to simulate external signal of strain and temperature, though FBG strain and temperature demodulation experiment, we inquiry the address of 3×3sensing matrix, realize the distributed FBG sensing network, due to the effect of external temperature, a temperature compensation is designed. In order to be more accuracy and smarter, a improved system is put forward.更多还原