高分辨率和长距离布里渊光栅型分布式光纤传感关键技术研究

项目名称： 高分辨率和长距离布里渊光栅型分布式光纤传感关键技术研究

项目编号： No.61205073

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 信息四处

项目作者： 董永康

作者单位： 哈尔滨工业大学

项目金额： 28万元

中文摘要： 基于布里渊光栅的新型分布式光纤传感器为高精度的温度和应变测量提供了一种全新的解决方案。针对目前本方向中面临的无法在保证高精度测量的同时进一步提高空间分辨率和延长传感距离这一国际难题，本项目将深入研究布里渊光栅激发和探测机制，提出采用连续泵浦光和脉冲泵浦光动态激发布里渊光栅以延长传感距离，并用脉冲对差分解析探测获得高测量精度和高空间分辨率的方案。本项目将围绕布里渊光栅的激发和探测这一中心问题，建立描述布里渊光栅激发和探测过程的五波耦合方程；研究连续泵浦光和脉冲泵浦光动态激发布里渊光栅机理和泵浦光参数的优化，以延长传感长度；研究脉冲对差分解析探测机制和脉冲参数的优化，以获得最佳的测量精度和空间分辨率。 本项目的研究将为实现高测量精度、高空间分辨率和长距离的布里渊光栅型分布式光纤传感技术提供一个新的途径，对于满足军用和民用设施的高端监测要求具有非常重要的意义和价值。

中文关键词： 受激布里渊散射；布里渊动态光栅；分布式传感；温度；应变

英文摘要： The Brillouin grating-based distributed optical fiber sensors provide a novel solution for the high-accuracy measurement of temperature and strain. To address the problem that it is difficult to improve the spatial resolution and extend the sensing range while keeping the high accuracy, this project will investigate the mechanisms of the excitation and probing of Brillouin grating in depth, and propose a scheme consisting of a CW pump and a pulsed pump to dynamically excite Brillouin grating to extend the sening range, and a differential resolving method using a probing pulse pair for high-accuracy and high-spatial-resolution. This project will focus on the issue of the excitation and probing of Brillouin grating. The five-wave coupled equations will be deduced to describe the excitation and probing of Brillouin grating; the mechanism of dynamically exciting Brillouin grating by using a CW pump and a pulsed pump will be investigated, and the pump parameters will be optimized to extend the sensing range; the mechanism of differential resolving method using a probing pulse pair will be investigated, and the pulse parameters will be optimized for a best accuracy and spatial resolution. The study of project will provide an opportunity to realize a high-accuracy, high-spatial-resolution and long-range distributed opt

英文关键词： Stimulated Brillouin scattering；Brillouin dynamic grating；distributed sensing；temperature；strain