改善布里渊光时域反射技术空间分辨率研究进展

在布里渊光时域反射（BOTDR）技术中，空间分辨率是一项重要的技术指标，受光纤中声学声子寿命的影响，工程领域应用的布里渊光时域反射仪空间分辨率多在一米，可以满足大多数的工程需求。近年来，随着工程应用场景不断扩大，如特种结构形变监测、管廊精确定位等领域对布里渊光时域反射仪空间分辨率的要求也不断提高。基于BOTDR的结构，阐述了两类提高BOTDR空间分辨率的方法，并回顾了十多年来提高空间分辨率关键技术的进展。在现有的硬件比较成熟的基础上，未来提高空间分辨率的方法将改进软件处理算法、多种编码与信号处理算法相结合使用的方向发展。

Improvement of spatial resolution in Brillouin optical time domain reflectometers

Spatial resolution is an important performance parameter in Brillouin optical time-domain reflection(BOTDR) technique. Affected by the acoustic phonon lifetime in the fiber, the spatial resolution of the Brillouin optical time domain reflectometer used in the engineering field is more than one meter, which can meet most engineering needs. With the continuous expansion of application scenarios, the requirements for the spatial resolution of Brillouin optical time domain reflectometers in fields such as special structural deformation monitoring and precise positioning of pipeline deformation are also increasing. This study introduces the structure of BOTDR and illustrates Two types of methods to improve the spatial resolution of BOTDR. Additionally, important progress in BOTDR sensing for decades are reviewed. On the basis of the relatively mature existing hardware, the method of improving the spatial resolution in the future will develop in the direction of improving the software processing algorithm and combining various signal processing algorithms.