基于倾斜光纤光栅的传感解调技术  

Sensing and Demodulation Technique Based on Tilted Fiber Bragg Grating

作　　者：张卫华[1] 童峥嵘[2] 苗银萍[1] 刘波[1] 董孝义[1] 

机构地区：[1]南开大学现代光学研究所教育部光电信息技术科学重点实验室,天津300071 [2]天津理工大学电子信息与通信工程学院,天津300191

出　　处：《纳米技术与精密工程》2008年第4期284-287,共4页Nanotechnology and Precision Engineering

基　　金：国家高技术研究发展计划(863)资助项目(2006AA01Z217);天津市高等学校科技发展基金资助项目(2006BA28);天津市高等科技发展基金资助项目(20060609);光电信息技术教育部重点实验室开放基金资助项目

摘　　要：该文设计了一种基于倾斜光纤光栅(tilted fiber Bragg grating,TFBG)的不受温度影响的光纤布拉格光栅(fiber Bragg grating,FBG)应变解调系统.将倾斜光纤光栅用作边沿滤波器,当周围环境温度变化时,利用倾斜光纤光栅纤芯模与包层模的温度特性与普通光纤布拉格光栅相同这一特点,无需另加温度补偿,就可以实现FBG应变传感的动态解调,消除温度噪声对应变信号的影响.由实验可知,当温度在25,℃到39,℃范围变化时,解调系统的性能基本不发生改变,解调范围达到6 nm.A fiber Bragg grating （FBG） strain demodulation system without temperature influence based on tilted fiber Bragg grating（TFBG） was designed in this paper. Since the temperature characteristics of core mode and cladding mode of TFGB are same as those of FBG and other temperature compensation is unnecessary, the system can achieve dynamical demodulation of FBG strain sensing to eliminate the effect of temperature noise on strain signal by using TFBG as edge filter when the surrounding temperature changes. The experimental results show that the performance of demodulation system does not change with a demodulation bandwidth of 6 nm when temperature changes from 25 ℃ to 39 ℃.

关 键 词：倾斜光纤光栅 边沿滤波器 线性解调 温度补偿 解调范围 

分 类 号：TP212.9[自动化与计算机技术—检测技术与自动化装置]