A co-propagating dual-wave interferometer- assisted Brillouin optical time domain analysis (DWI-BOTDA) integrated sensing system is proposed and experimentally demonstrated for high sampling rate dynamic sensing. Fast dynamic strain measurement is achieved by the DWI based on analyzing the relative phase variation between two co-propagating light waves with significantly improved dynamic strain measurement range (DSMR). Meanwhile, the BOTDA with high spatial resolution is employed to locate the dynamic events accurately. In the experiment, the enhancements on the DSMR and sensing stability in the DWI are validated. Then, the DWI-BOTDA is implemented to measure periodical mechanical vibration over 2 km sensing range with 10 kHz sampling rate and 2 m spatial resolution.

中文翻译：

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用于动态传感的 DWI 辅助 BOTDA

提出了一种共传播双波干涉仪辅助布里渊光时域分析 (DWI-BOTDA) 集成传感系统，并通过实验证明了其可用于高采样率动态传感。DWI 基于分析两个共同传播的光波之间的相对相位变化，实现了快速动态应变测量，动态应变测量范围 (DSMR) 显着提高。同时，采用高空间分辨率的BOTDA对动态事件进行准确定位。在实验中，对DSMR的增强和DWI中的传感稳定性进行了验证。然后，使用 DWI-BOTDA 以 10 kHz 采样率和 2 m 空间分辨率测量 2 km 传感范围内的周期性机械振动。