光学学报, 2004, 24 (8): 1111, 网络出版: 2006-06-12
微波电光调制的布里渊散射分布式光纤传感技术 下载: 587次
The Technique of Brillouin Scattering-Distributed Optical Fiber Sensing Based on Microwave Electrooptical Modulation
光纤传感 布里渊散射分布式光纤传感器 电光调制 光相干检测 optic-fiber sensing Brillouin scattering-distributed optical fiber se electrooptical modulation optical coherent detection
摘要
在分析布里渊散射分布式光纤传感器检测原理的基础上,针对布里渊散射光信号比较微弱且和瑞利散射光之间存在频移的特点,采用微波电光调制产生频率可调的参考光,和后向布里渊散射光进行相干检测,得到放大的布里渊散射光信号,再用高速模拟数字转换和存储叠加进行时序信号处理,最后得到分布式传感信号。给出了各部分实验过程和结果,得出与理论分析一致的布里渊散射光频谱和光强随温度升高而产生变化。实现了25 km的分布式温度传感,初步实验结果证明了方案的可行性。
Abstract
The technique of Brillouin scattering-distributed optical fiber sensing has been presented and demonstrated experimentally. Brillouin scattering light is very weak, has frequency shift with the Rayleigh scattering light. So microwave electric optical modulation is adopted to produce frequency-adjustable reference light, which is heterodyne detected with Briilouin back-scattering light. The detecting photoelectric signal is first converted into digital signal by hi-speed analog-digital converter, then the digital signal is stored and added, at last the distributed sensing signal with better signal-to-noise ratio is gained. The experimental procedures and results are presented. The results show that the frequency and light intensity of Brillouin scattering light vary with the change of temperature. The 25 km distributed sensing of temperature is achieved, and the primary results confirm that the configuration is feasible.
宋牟平. 微波电光调制的布里渊散射分布式光纤传感技术[J]. 光学学报, 2004, 24(8): 1111. 宋牟平. The Technique of Brillouin Scattering-Distributed Optical Fiber Sensing Based on Microwave Electrooptical Modulation[J]. Acta Optica Sinica, 2004, 24(8): 1111.