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布里卢恩扩展了基于双光学频率的时间域分析.
Jae Hyeong Youn1, Kwang Yong Song2, Sonia Martin-Lopez3
1Dept. of Physics, Chung-Ang University, Seoul, Korea.
Light, science & applications
|July 2, 2024
概括
布里卢恩扩展时间域分析 (BETDA) 实现了低带宽的高分辨率光纤传感. 这种新的方法使用双光学频率子来精确测量热点.
科学领域:
- 光学工程是指光学工程.
- 光纤传感传感器是指光纤传感器.
- 计量学 计量学 计量学
背景情况:
- 布里卢恩光学时域分析 (BOTDA) 是一个关键的分布式光纤传感技术.
- 传统的BOTDA空间分辨率受到脉冲持续时间的限制,需要高的电子带宽.
- 需要高分辨率的传感器,降低带宽要求.
研究的目的:
- 引入布里卢恩扩展时间域分析 (BETDA) 作为修改后的BOTDA系统.
- 为了证明同时实现高空间分辨率和低检测带宽.
- 为了能够精确地测量光纤中局部事件.
主要方法:
- 使用了两个光学频率 (OFC) 具有不同的频率间隔作为和探头.
- 记录的本地Brillouin通过扩展时间域中的光谱跳动痕迹获得光谱.
- 为双 OFC 采用了定制的光谱相位,线距和带宽.
主要成果:
- 在230米单模光纤中成功测量了2厘米长的热点.
- 实现了高空间分辨率,检测带宽低于100 kHz.
- 证明了BETDA技术在精确局部测量的有效性.
结论:
- 与传统的BOTDA系统相比,BETDA提供了显著的进步.
- 双OFC方法可以在低带宽下实现高分辨率分布式传感.
- 这项技术有可能用于需要精确光纤监控的各种应用.
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01:21Time and frequency -Domain Interpretation of Phase-lag Control
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