混沌布里渊光相关域分析技术进展

Progress in Chaotic Brillouin Optical Correlation-Domain Analysis

分布式光纤传感技术已广泛应用于基础设施的健康监测、军事国防安全等领域,长距离高空间分辨率的混沌布里渊光相关域分析(chaotic BOCDA)技术具有广阔的发展和应用前景。Chaotic BOCDA以类噪声、宽频带、宽光谱的混沌激光为探测信号,分别利用其类δ函数特性拓展传感距离、利用自相关特性提高空间分辨率以及利用高斯型光谱特性获得本征展宽的布里渊增益谱。基于上述特性,分别综述了10.2 km长传感距离、3.5 mm高空间分辨率和1200με大范围动态应变监测的chaotic BOCDA系统。此外,还分析讨论了chaotic BOCDA技术的优缺点,并对其发展前景进行了展望。

Distributed optical fiber sensing technology has been widely applied in the areas of infrastructure health monitoring, national defense security and etc. Long-reach high-spatial-resolution chaotic Brillouin optical correlationdomain analysis(chaotic BOCDA) technology has extensive development and application prospects. Chaotic laser of noise-like, wide-band radio frequency spectrum and broadband optical spectrum is served as signal source in chaotic BOCDA. Therefore, the sensing distance is extended by its δ-like function, the spatial resolution is improved by its auto-correlation property, and the intrinsically broadened Brillouin gain spectrum is obtained by its Gaussian optical spectrum. Based on these characteristics, this review article provides an overview of our recent progresses in chaotic BOCDA system with 10. 2 km-long sensing distance, 3. 5 mm-high spatial resolution and 1200 με-large dynamic range. Moreover, the relative merits and avenues for future research and development of chaotic BOCDA technology are also discussed and prospected.