Effects of modulated pulse format on spontaneous Brillouin scattering spectrum and BOTDR sensing system
Effects of modulated pulse format on spontaneous Brillouin scattering spectrum and BOTDR sensing system
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DOI：
10.1016/j.optlastec.2012.04.025
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发表时间：
2013-03-01
影响因子：
5
通讯作者：
Yang, Zhongmin
中科院分区：
文献类型：
--
作者：
Hao, Yunqi;Ye, Qing;Yang, Zhongmin
从理论上分析了自发布里渊散射光谱对布里渊光时域反射（BOTDR）传感系统信噪比（SNR）的增强作用，并通过改变调制脉冲的形式进行了实验验证。在相同的脉冲宽度或空间分辨率下，三角形脉冲的信噪比较大。以200 ns宽度为例，梯形脉冲和三角形脉冲的相干检测功率谱信噪比分别比矩形脉冲提高了3dB和4.8dB。从矩形脉冲到三角脉冲，相应的光谱线宽变窄，传感距离也增加了约两倍。这一现象将有助于在相同的系统条件下提高BOTDR传感系统的空间分辨率或实现更长的传感距离。(C)2012爱思唯尔有限公司保留所有权利。
The signal noise ratio (SNR) enhancement effects of spontaneous Brillouin scattering spectrum on Brilloluin optical time domain reflectometry (BOTDR) sensing system have been analyzed theoretically and demonstrated experimentally through changing the modulated pulse format. With the same pulse width or same spatial resolution, the SNR is larger for triangular pulse. Take the width of 200 ns as an illustration, the SNRs of the coherent detection power spectrum for trapezoidal pulse and triangular pulse increase 3 dB and 4.8 dB relative to that of rectangular pulse respectively. The corresponding spectral linewidthes are narrowed and the sensing distances are also increased by about two times from the rectangular pulse to the triangular pulse. This phenomenon will be helpful to improve the spatial resolution or achieve longer sensing distance in the BOTDR sensing system at the same systemic conditions. (C) 2012 Elsevier Ltd. All rights reserved.