分布式光纤传感技术在建筑、煤矿、石油、电力、航空航天等领域具有重要的应用。基于布里渊散射的分布式光纤传感技术具有可同时测量温度和应变且精度高的优点，但其存在难以同时实现高空间分辨率与长距离传感测量的问题。 本项目提出了一种混沌激光布里渊相干域反射测量方法。混沌激光具有相干长度可调谐、频谱带宽和中心频率可控的特性。本方法采用混沌激光作为探测光，结合相干域反射技术，利用快速可变光延迟线调节参考光光程，通过检测参考光与探测光在传感光纤中不同位置的后向布里渊散射光的干涉信号，获知整条传感光纤的温度应变分布信息。此方法可同时实现高空间分辨率、长距离的分布式光纤传感测量，且无需昂贵的脉冲信号发生器、高频信号微波源及电光吸收调制器，装置简单、成本较低。 本方案的实现有望发展一种新的基于混沌激光的布里渊散射分布式光纤传感技术，为长距离高分辨率分布式光纤传感测量提供新方法。

Distributed optical fiber sensing technology has important applications such as construction, mining, petroleum, electric power, aerospace etc. Distributed optical fiber sensing technology based on Brillouin scattering has the advantages of simultaneous measurement of strain and temperature, along with the high precision. However, the drawback of these methods is that they can not simultaneously achieve high spatial resolution and long distance in sensing measurements . This project proposes a chaotic Brillouin optical coherent domain reflectometry. By utilizing the chaotic laser with tunable coherent length and controllable broad band spectrum as the probe light, combined with the coherent domain reflection technology, and using rapid variable optical delay line to adjust the reference light path, we will obtain the information of the temperature and strain by detecting the interference signal of the back Brillouin scattering light and reference light of different locations in sensing fiber. This method can realize the long distance, high spatial resolution distributed fiber sensing with the simple device and the low cost instead of using the expensive pulse signal generator, high frequency microwave signal source and electric absorption modulator. The implementation of this project is hopeful to develop a novel method of Brillouin scattering distributed optical fiber sensing based on chaotic laser, and it can promote the further development in the field of the optical fiber sensing measurement.