Phase-sensitive optical time domain reflectometry (Ф-OTDR) is an effective way to detect vibrations and acoustic waves with high sensitivity, by interrogating coherent Rayleigh backscattering light in sensing fiber. In particular, fiber-optic distributed acoustic sensing (DAS) based on the Ф-OTDR with phase demodulation has been extensively studied and widely used in intrusion detection, borehole seismic acquisition, structure health monitoring, etc., in recent years, with superior advantages such as long sensing range, fast response speed, wide sensing bandwidth, low operation cost and long service lifetime. Significant advances in research and development (R&D) of Ф-OTDR have been made since 2014. In this review, we present a historical review of Ф-OTDR and then summarize the recent progress of Ф-OTDR in the Fiber Optics Research Center (FORC) at University of Electronic Science and Technology of China (UESTC), which is the first group to carry out R&D of Ф-OTDR and invent ultra-sensitive DAS (uDAS) seismometer in China which is elected as one of the ten most significant technology advances of PetroChina in 2019. It can be seen that the Ф-OTDR/DAS technology is currently under its rapid development stage and would reach its climax in the next 5 years.
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机译：相敏光学时域反射测量仪（Ф-OTDR）是通过在感测光纤中询问相干瑞利反向散射光而检测具有高灵敏度的振动和声波的有效方法。特别地，基于Ф-OTDR的光纤分布式声学传感（DAS）已经广泛研究并广泛用于入侵检测，钻孔地震采集，结构健康监测等，近年来具有卓越的优势如感测范围长，响应速度快，灵感带宽广，操作成本低，服务寿命长。自2014年以来已经制定了Ф-OTDR的研究和开发（R＆D）的重大进展。在本次审查中，我们对Ф-OTDR的历史审查综述，然后总结了Ф-OTDR在光纤研究中心的最近进展（Forc ) at University of Electronic Science and Technology of China (UESTC), which is the first group to carry out R&D of Ф-OTDR and invent ultra-sensitive DAS (uDAS) seismometer in China which is elected as one of the ten most significant technology 2019年中石油的进展。可以看出，Ф-oTDR / DAS技术目前在其快速发展阶段，并将在未来5年内达到高潮。
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