基于数字增强干涉的超高灵敏度三维光纤地震测量方法研究

项目名称： 基于数字增强干涉的超高灵敏度三维光纤地震测量方法研究

项目编号： No.61307104

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： 彭峰

作者单位： 哈尔滨工程大学

项目金额： 26万元

中文摘要： 面向地震预警和防震减灾等国家重大民生需求，面对发展新型地震监测方法与手段的核心科学问题和关键技术难题，项目拟开展新型光纤地震监测方法的研究，发展一种高灵敏度、低噪声、宽频带、大动态范围的三维光纤地震测量技术,探索光纤地震测量的灵敏度倍增新机理和新方法，提升和优化测量单元的灵敏度、体积等关键性能；发展基于码分复用的光纤干涉地震测量的解调新方法，攻克光纤光路的噪声抑制技术，提升测量的信噪比和动态范围；发展基于数字增强的新型信号后处理方法，攻克光源频率噪声的抑制技术，突破光纤地震测量的低频测量极限、扩展频带宽度；构建基于码分复用三维光纤地震测量系统，突破灵敏度、噪声、频带、动态范围等光纤地震测量关键技术性能，实现对传统地震测量方法的有效替代。本项目将极大地促进光纤地震监测方法和技术的实用化进程，为地震前兆信息的获取和地震预警、防震减灾奠定了关键技术和设备的基础，提供一种有效的监测技术手段。

中文关键词： 光纤传感；地震监测；数字增强干涉；噪声抑制；高灵敏度

英文摘要： Facing the major livelihood needs of earthquake warning and disaster reduction, and the core scientific issues and key technical problems of developing new earthquake monitoring method, the project intends to develop an new fiber-optic seismic monitoring method with the measuring technology with the characteristics of three-dimension high sensitivity, low noise, wide bandwidth and large dynamic range. The project explores the new method of increasing the sensitivity in the fiber-optic seismic measurement, enhances and optimizes the key performance of sensitivity and volume in the measuring unit; based on code division multiplexing, the project develops a new demodulation method in fiber-optic seismic measurement, which overcome the problem of noise suppression in optical path, and improve the measured signal-to-noise ratio and dynamic range; in the project, an new digitally enhanced signal processing method is developed, the problem of the light source frequency noise suppression technology is overcome, the low-frequency measurement limit and the expansion of bandwidth is broke; three-dimension fiber-optic seismic measuring system based on code division multiplexing is built, which improves the key technical performance of sensitivity, noise, frequency band, dynamic range, and realizes an effective alternative t

英文关键词： Optical fiber sensing；seismic monitor；digitally enhanced interferometry；noise suppression；high-sensitivity