Otsubo Kenta, Zhu Guangtao, Kiyozumi Takaki, Noda Kohei, Nakamura Kentaro, Lee Heeyoung, Mizuno Yosuke
Faculty of Engineering, Yokohama National University, Yokohama, 240-8501, Japan.
Institute of Innovative Research, Tokyo Institute of Technology, Yokohama, 226-8503, Japan.
Sci Rep. 2023 Oct 16;13(1):17531. doi: 10.1038/s41598-023-44801-4.
Brillouin optical correlation-domain analysis (BOCDA) utilizing low-coherence light sources offers high-resolution distributed strain and temperature sensing. However, conventional BOCDA requires dual-end injection of pump and probe light into the sensing fiber. To overcome this limitation, low-coherence Brillouin optical correlation-domain reflectometry (BOCDR) based on spontaneous Brillouin scattering has emerged, enabling single-end light injection. While a pilot demonstration has shown a spatial resolution of 19 cm, a comparison of its measurement accuracy with standard BOCDR systems is yet to be explored. This study presents a distributed measurement with ~ 3 cm spatial resolution and demonstrates that low-coherence BOCDR eliminates systematic errors caused by direct sinusoidal modulation, offering enhanced measurement precision.
利用低相干光源的布里渊光相关域分析（BOCDA）可实现高分辨率分布式应变和温度传感。然而，传统的BOCDA需要将泵浦光和探测光双端注入传感光纤。为克服这一限制，基于自发布里渊散射的低相干布里渊光相关域反射测量法（BOCDR）应运而生，实现了单端光注入。虽然初步演示已显示出19厘米的空间分辨率，但尚未对其与标准BOCDR系统的测量精度进行比较。本研究展示了具有约3厘米空间分辨率的分布式测量，并证明低相干BOCDR消除了直接正弦调制引起的系统误差，提高了测量精度。
