摘要
提出一种基于布里渊光时域反射计法的分布式光纤布里渊散射温度传感系统 .光源采用窄谱半导体激光器 .声光调制器将光源调制成窄脉冲 ,并由高增益光纤放大器放大 ,产生高功率光脉冲信号 ,提高了自发布里渊散射信号的强度 .采用双通马赫 -曾德干涉仪将布里渊散射从瑞利散射中分离出来 ,在一段 4 .2 5km长的光纤上进行分布式温度传感的实验研究 .双通马赫 曾德干涉仪对瑞利散射进行了很好的抑制 ,得到了比较纯净的随温度变化的布里渊散射信号 .
A distributed temperature sensing system based on optical fiber Brillouin scattering was presented. A narrow line width LD was used as a light source. The light from LD was modulated by an AOM and amplified by a high gain EDFA to generate high power light pulse. Thus a high intensity spontaneous Brillouin scattering was achieved. A double-pass all-fiber Mach-Zehnder interferometer was designed and used to separate Brillouin scattering from Rayleigh scattering. Experimental studies about temperature sensing were carried out on a section of 4.25 km long optical fiber. Temperature sensing signal was obtained without the influence of Rayleigh scattering which was rejected extremely by the double-pass all-fiber Mach-Zehnder interferometer.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2003年第1期14-17,共4页
Acta Photonica Sinica
