基于全同超弱反射光纤光栅阵列的实用解调系统研究  

Research of practical demodulation system based on Ultra⁃Weak FBG array

作　　者：李博 李凯 江山 LI Bo;LI Kai;JIANG Shan(Wuhan Post and Telecommunications Research Institute,Wuhan 430000,China;Wuhan Fengli Optoelectronic Technology Co.,Ltd.,Wuhan 430000,China)

机构地区：[1]武汉邮电科学研究院,湖北武汉430000 [2]武汉烽理光电技术有限公司,湖北武汉430000

出　　处：《电子设计工程》2023年第7期146-150,155,共6页Electronic Design Engineering

摘　　要：基于实现长距离多测点的准分布式传感系统的需求,提出了一种应用于全同弱反射光栅阵列传感的解调算法,采用了可调谐光源扫描法和相应的寻峰算法作为系统解调算法,通过在相同温度不同光源强度下和相同光源强度不同温度下系统的稳定性和线性度实验,检验了系统的稳定性和线性度。当选择反射率小于0.01%的弱反射光栅时,解调系统可以满足8公里的测量长度,约8 000个传感测点的需求。在解调系统线性度实验中当实验温度步进为0.5℃时拟合系数可以达到0.995以上。A demodulation algorithm for isotactic weak reflection grating array sensing is proposed to meet the requirements of long⁃distance multi⁃point quasi⁃distributed sensing system.The tunable light source scanning method and the corresponding peak⁃seeking algorithm are adopted as the system dem⁃odulation algorithm.The stability and linearity of the system are tested by experiments on the stability and linearity of the system under the same temperature and different light source intensities and the same light source intensity and different temperatures.When a weak reflection grating with a reflectivity of less than 0.01%is selected,the demodulation system can meet the requirements of 8 kilometers in length and 8000 sensing points.In the linearity experiment of the demodulation system,when the experimental temperature step is 0.5℃,the fitting coefficient can reach more than 0.995.

关 键 词：光纤光栅阵列 解调系统 寻峰算法 光纤传感 

分 类 号：TN29[电子电信—物理电子学]