光学学报, 2017, 37 (11): 1106004, 网络出版: 2018-09-07   

脉冲编码瑞利布里渊光时域分析温度传感技术 下载: 890次

Temperature Sensing Technology Based on Rayleigh Brillouin Optical Time Domain Analysis with Pulse Coding
作者单位
华北电力大学电子与通信工程系, 河北 保定 071003
摘要
瑞利布里渊光时域分析系统(BOTDA)存在信号小、噪声大的问题,会导致系统空间分辨率与信噪比难以同时提高。将脉冲编码技术引入瑞利BOTDA系统,可在不降低空间分辨率的前提下有效地提高系统信噪比和布里渊频移测量精度。分析了瑞利BOTDA温度传感系统的原理,介绍了Golay互补序列的特性,并给出了单脉冲和编码脉冲系统的信噪比表达式;搭建了单脉冲和脉冲编码瑞利BOTDA温度传感系统,测量了单脉冲瑞利BOTDA系统的温度传感特性及脉冲编码瑞利BOTDA系统的空间分辨率和温度测量精度。实验结果表明,由瑞利BOTDA系统获得的布里渊频移与温度呈良好的线性关系,温度系数为(1.109±0.010) MHz·℃ -1;当采用10 ns脉冲宽度、64 bit格雷编码时,在1.77 km光纤的加温段上实现了空间分辨率为1 m、温度测量精度为1.39 ℃的传感测量。
Abstract
Spatial resolution and signal-to-noise ratio are difficult to be improved at the same time due to the small signal and big noise in Rayleigh Brillouin optical time domain analysis (BOTDA) system. A technique of pulse coding is introduced into Rayleigh BOTDA system, and then the signal-to-noise ratio and Brillouin frequency shift measurement accuracy of the system can be improved effectively without decreasing spatial resolution. The principle of the temperature sensing system based on Rayleigh BOTDA is analyzed. The characteristic of Golay complementary sequence is introduced and the expressions of the signal-to-noise ratio between single pulse system and coded pulse system are achieved. Rayleigh BOTDA temperature sensing systems of single pulse and coded pulse are constructed. The temperature sensing characteristic of single pulse system and the spatial resolution and the accuracy of temperature measurement of coded pulse system are measured. The experimental results show that the Brillouin frequency shift obtained by the Rayleigh BOTDA system has a linear relationship with temperature, and the temperature coefficient is (1.109±0.010) MHz·℃ -1. The spatial resolution of 1 m and temperature accuracy of 1.39 ℃ are obtained on the heated section of 1.77 km fiber when Golay code is 64 bit and the pulse width is 10 ns.

张立欣, 李永倩, 安琪, 李晓娟. 脉冲编码瑞利布里渊光时域分析温度传感技术[J]. 光学学报, 2017, 37(11): 1106004. Lixin Zhang, Yongqian Li, Qi An, Xiaojuan Li. Temperature Sensing Technology Based on Rayleigh Brillouin Optical Time Domain Analysis with Pulse Coding[J]. Acta Optica Sinica, 2017, 37(11): 1106004.

本文已被 5 篇论文引用
被引统计数据来源于中国光学期刊网
引用该论文: TXT   |   EndNote

相关论文

加载中...

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!