基于光脉冲时间偏移量的分布式光纤传感机理研究

项目名称： 基于光脉冲时间偏移量的分布式光纤传感机理研究

项目编号： No.51505506

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 机械、仪表工业

项目作者： 崔陆军

作者单位： 中原工学院

项目金额： 20万元

中文摘要： 基于光强、波长、相位或频率调制的传统分布式光纤传感系统中，光脉冲时间偏移量往往被忽略而没有进行深入研究，其中所蕴含的温度、应变和压力等测量信息也未利用。针对当今分布式光纤传感系统兼备动态响应快、测量精度和分辨率高等需求，本项目通过研究光纤中的光脉冲时间偏移量，应用光脉冲相关性和差分技术建立一种新颖的分布式光纤传感机理模型，采用理论建模计算与实验测试验证相结合的方法，对基于光脉冲时间偏移量的分布式光纤传感机理进行研究，重点揭示光脉冲相关性检测中时间偏移量与光纤周围温度和应变等被测量之间的函数关系；探索消除光纤残余双折射漂移效应影响的光学补偿原理和方法；阐明区域可选择性的分布式光纤传感定位机制。本项目将为该种基于光脉冲时间偏移量的分布式光纤传感技术奠定坚实的理论基础，同时为兼备高时间分辨率、高空间分辨率、区域可选择和实时性好等优点的分布式光纤传感系统检测提供一种全新的方法和途径。

中文关键词： 光纤；光脉冲相关性；时间偏移量；分布式光纤传感

英文摘要： Optical pulse time offset was neglected and lack of researching in conventional distributed optical sensing, which was based on the intensity, wavelength, phase or frequency modulation of optical signal, and the temperature, strain and pressure which contained in optical pulse time offset were not widely detected and used. Nowadays the distributed optical fiber sensing possesses a lot of merits, such as the fast transient response, higher resolution and high detecting precision. So aiming at the requirements, a novel distributed optical fiber sensing mechanism theoretical model based on optical pulse correlation and differential technique was presented. Through the combination of numerical simulation and experimental method, it revealed the function relationships between optical pulse time offset and the measured physical quantities in the correlation detection, explored optical compensation principle for fiber residual birefringence offset effect, and expounded the distributed optical sensing location mechanism in selectable-regions detection theory. These studies offered firm theory foundation for distributed optical sensing technique based on optical pulse time offset, at the same time, it developed an novel approach that for the distributed fiber optical sensing system, which exhibited the features of the high time/space resolution, selectable regions and real-time.

英文关键词： Optical fiber;Optical pulse correlation;Time offset;Distributed optical fiber sensing