基于瑞利散射的单端BOTDA系统温度特性研究

提出一种不受电光调制器传输曲线温度漂移现象影响的基于瑞利散射的单端布里渊光时域分析系统,并对系统所需的合成信号及温度特性进行分析,通过搭建单端布里渊光时域分析温度传感系统测量系统的温度特性.结果表明:通过测量布里渊增益谱获得的布里渊频移与温度呈良好的线性关系;由单端布里渊光时域分析温度测量系统获得的布里渊频移的温度系数为1.109 MHz/℃,与传统双端布里渊光时域分析系统获得的1.20 MHz/℃具有良好的一致性,在1.77 km光纤上可实现9.5m空间分辨率的温度传感测量.

Research on Temperature Characteristic of Single-Ended BOTDA System Based on Rayleigh Scattering

A single-ended Brillouin optical time domain analysis system based on Rayleigh scattering is proposed,which is not affected by the temperature drift phenomenon of electro-optic modulator transmission curve.Both the synthesis signal required by the system and temperature characteristic are analyzed.By setting up a single-ended Brillouin optical time domain analysis sensing system is set up to measure the temperature characteristic.The results show that the Brillouin frequency shift obtained by Brillouin gain spectrum had a good linear relationship with temperature.The temperature coefficient of Brillouin frequency shift obtained by single-ended Brillouin optical time domain analysis temperature measurement system is 1.109 MHz/℃,which is well consistent with the result of 1.2 MHz/℃ obtained by the conventional double-ended Brillouin optical domain analysis system.The temperature sensing measurement with a spatial resolution of 9.5 m is obtained over a fiber length of 1.77 km.