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动态分布式光纤传感基于同时测量Brillouin增益和损失光谱,使用频率敏捷技术

Dengwang Zhou, Pengduo Li, Dexin Ba

|June 15, 2023

概括

这项研究为布里卢恩光学时域分析 (BOTDA) 系统引入了一种新的频率敏捷技术. 该方法简化了设备,并通过同时测量Brillouin增益和损失光谱来提高信号噪声比.

科学领域:

光学是什么?光学是什么?光学是什么?
光子学是一个光子学.
频谱学是一种光谱学.

背景情况:

传统的Brillouin光学时间域分析 (BOTDA) 系统面临着复杂的实验设置和有限的信号噪声比 (SNR) 的挑战.
同时测量Brillouin收益和损失光谱对于增强分析是可取的,但往往需要复杂的配置.

研究的目的:

建议并验证使用频率敏捷技术的简化BOTDA方案.
为了实现同时测量Brillouin的收益和损失光谱.
为了提高BOTDA测量的信号噪声比 (SNR).

主要方法:

将波调节为双侧频带灵活脉冲列车 (DSFA-PPT).
使用一个连续的探头波,由一个固定的频率向上移动.
采用DSFA-PPT的频率扫描,通过刺激的布里卢恩散射与探测波相互作用.
在单个频率敏捷周期内同时生成Brillouin损失和增益光谱.

主要成果:

同时获得了Brillouin的收益和损失光谱.
合成Brillouin光谱被生成,显示了20ns脉冲的3.65dBSNR改善.
实验设置被简化,不需要光学波器.
进行了成功的静态和动态测量.

结论:

拟议的频率敏捷技术为BOTDA提供了一种简化和更有效的方法.
同时的Brillouin增益和损失光谱测量提高了系统性能,并简化了实验设计.
该方法在SNR中提供了显著的改进,为更强大的光学传感应用铺平了道路.

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