基于数字增强干涉的Phase-OTDR高灵敏度定量测量技术研究

项目针对长距离Phase-OTDR分布式振动光纤传感技术在大型公共基础设施（高速铁路、油气管线、输电线路等）监控中对微弱扰动信号的准确定量化测量的迫切应用需求，以及我们前期在分布式光纤传感技术的研究基础，拟开展基于数字增强干涉的Phase-OTDR高灵敏度定量测量技术研究。在通过优化单元器件的噪声特性提升相干探测Phase-OTDR系统性能的基础上，将现有的Phase-OTDR技术与通信领域的数字编码技术结合，对伪随机码技术及其光频分复用技术等关键技术的详细研究和探索，以期突破目前相关分布式光纤传感领域发展所面临的低信噪比、低采样速率、相位非定量检测等若干瓶颈问题和技术矛盾，获得长距离的Phase-OTDR分布式光纤传感系统在性能上质的提升，促进整个光纤传感领域及产业蓬勃的发展。

Based on the urgent requirements of long-distance distributed Phase-OTDR technology for the quantitative measurement of weak fiber backscattering signals in the field of large public infrastructures and our researched foundation in fiber sensors, a high-sensitivity quantitative measurement technology in the Phase-OTDR based on the digital enhanced interference is proposed and analyzed. Except for optimizing the noise characteristic of the unit laser device to improve the performance of the coherent detection, the contents of this project will include to combine the Phase-OTDR sensors technology with digital coding technology of communication and research pseudo random code technique and optical frequency division multiplexing in detail. some key technologies, such as low signal to noise ratio, low sampling rate and non-quantitative measurement of phase will be broken through and the performances of Phase-OTDR will be improved in essence which will boost the whole field of fiber sensors.