超高分辨率光纤地壳应变张量检测关键技术研究

项目名称： 超高分辨率光纤地壳应变张量检测关键技术研究

项目编号： No.61307106

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 无线电电子学、电信技术

项目作者： 刘庆文

作者单位： 上海交通大学

项目金额： 25万元

中文摘要： 本项目通过研究一种新的超高精度、超大量程、多点复用高速光纤准静态应变传感技术，提出一种测量地壳三维应变张量的方法，为地壳形变的观测乃至地震科学的研究提供了一种全新的技术手段。为克服现有地壳应变仪不能提供地壳应变张量信息的缺陷，本项目将研究光纤应变传感器的空间布设结构，以较少数量的传感器实现三维应变张量的检测；针对当前光纤应变传感技术在准静态领域内存在的应变分辨率与量程之间的矛盾，以及难以实现多点复用传感的问题，本项目提出利用F-P标准具参考源和相位-强度复合调制解调技术，实现传感器的超大量程、超高分辨率和多点复用；本项目还将研究半导体激光光源的高精度变速波长调谐技术，在实现超高应变分辨率的同时提高测量速度。 本项目的研究将为光纤地壳应变张量检测系统的实现奠定理论和技术基础，在高性能光纤传感技术领域和地球科学特别是地震研究领域都具有非常重要的意义。

中文关键词： 光纤光栅；应变传感器；超高精度；多点复用；三维应变张量

英文摘要： In this research project, we propose a crustal strain tensor measuring technique based on the development of a novel ultra-high-resolution, large measurement range, multiplexed optical fiber sensing technique, providing a new tool for the geophysical research field. This research project will investigate the structure of fiber sensor head so as to realize strain tensor measurement in three- dimensional space with a few optical fiber strain sensors, while the traditional strain gauge can only provide the horizontal strain information of the curst. To overcome the trade-off between measurement resolution and range of current optical fiber sensing technique in quasi-static domain, this project proposes a scheme consisting of a Fabry-Perot etalon and a phase-intensity dual modulation method to realize ultra-high resolution, large measurement range and the ability of multiplexed sensing. High precision variable laser wavelength tuning method will also be studied for quick sensing speed without the degradation of strain resolution. The research of this project will provide an opportunity to realize an ultra-high resolution, large measurement range, multiplexed and high speed interrogation method for optical fiber sensors in the quasi-static domain, and lay the foundation of optical fiber sensors based crustal strain

英文关键词： fiber Bragg grating；strain sensor；ultra-high resolution；multiplexed sensing；three-dimensional strain tensor