用于布里渊分布式光纤传感的光学锁相技术研究
文献类型：学位论文
| 作者 | 彭交波 |
| 学位类别 | 硕士 |
| 答辩日期 | 2012 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 蔡海文 |
| 关键词 | 自发布里渊散射，光纤传感，分布式传感，光学锁相，相频检测器 |
| 其他题名 | Study of Optical Phase Locked Loop for Brillouin Distributed Optical Fiber Sensing |
| 中文摘要 | 分布式光纤传感器是目前国内外传感领域研究的热点，它具有灵敏度高，抗电磁干扰能力强，电绝缘性能好，化学稳定性好，长距离分布式探测等优点，能够用于大型基础建筑、电力电网、输油管道等领域的结构健康监测，具有广泛的应用前景。发展分布式光纤传感技术已成为国际高科技竞争的焦点和制高点，代表了未来传感技术的发展方向。基于布里渊散射效应的分布式光纤传感具有多参数感知、空间分辨率高、传感距离长、测量精度高等优点，近年来倍受关注，但宽带布里渊频移的高精度测量一直是该技术亟待解决的关键问题之一。针对这一问题，本论文研究了一种基于光学锁相的宽带移频技术，大大降低了系统探测和信号处理的难度，其主要研究内容以及研究结果如下： 1. 设计了一种用于布里渊分布式光纤传感的光学锁相系统。采用光学锁相的方法将相干探测中的本地激光器移频11GHz，实现将布里渊分布式光纤传感系统中的光学相干拍频由11GHz降低到百MHz量级，大大降低了系统探测和信号处理的难度。实验结果表明本地光和自发布里渊散射光的拍频信号的中心频率的波动为±1MHz，可以满足温度分辨精度为±1℃的要求。 2. 采用自研的单频光纤激光器作为主激光器，商用半导体DFB激光器作为从激光器进行了光学锁相实验，并测量其拍频信号的短期频率稳定性、长期频率稳定性和阿伦方差。实验结果表明，环路锁定前后，两个激光器拍频信号的频率波动从10MHz变为50Hz。 |
| 英文摘要 | Distributed optical fiber sensor attracts a lot of interests in the field of sensing. It has high sensitivity, immunity to electromagnetic interference, electrical insulation, good chemical stability, long-distance distributed detection, etc. It can be used for a variety of large-scale construction，temperature and strain monitoring of the industrial areas, has broad application prospects. The distributed fiber sensing system based on Brillouin scattering has many advantages，such as multi-parameter detection, high spatial resolution，long sensing length，high measuring precision，makes it has been paid more and more attention in the recent years，but the precise measurement of the broad band Brillouin frequency shift is a critical problem to be solved，according to this problem，the broad band frequency shift technology based on optical phase locked loop is study in this thesis，this can reduce the difficulty of system detection and signal processing, The main contents and research achievements of this dissertation are as follows: 1. Aim at effectively demodulating the high Brillouin frequency shift (11GHz) based on spontaneous Brillouin scattering distributed fiber sensing system, an optical phase-locked system is designed to decrease the optical coherent beat frequency from 11GHz to the order of 100MHz, The fluctuations of the center frequency of the beat signal between the local laser and spontaneous Brillouin scattering light is ±1MHz, which can achieve the temperature resolution of ±1℃ in the distributed fiber sensing system. 2. The optical phase-locked method is investigated and demonstrated, in which a home-made single-frequency fiber laser is used as the master laser, and a commercial semiconductor DFB laser as the slave laser, and the frequency short-term stability, the long-term frequency stability of the optical phase-locked loop and the Allan variance of the beat signal are measured. The experimental results show that while the system is locked, the frequency fluctuation of the beat signal is remarkably decreased from 10MHz to 50Hz. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16737]  |
| 专题 | 上海光学精密机械研究所_学位论文 |
| 推荐引用方式 GB/T 7714 | 彭交波. 用于布里渊分布式光纤传感的光学锁相技术研究[D]. 中国科学院上海光学精密机械研究所. 2012. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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