Bundesanstalt für Materialforschung und -prüfung, Unter den Eichen 87, 12205 Berlin, Germany.
Sensors (Basel). 2019 Mar 29;19(7):1527. doi: 10.3390/s19071527.
We present, to our knowledge for the first time, a 100-km Brillouin Optical Frequency-Domain Analysis (BOFDA) employing a 200-km fiber loop. Compared to our previous publication, enhanced sensor length, sensor accuracy and spatial resolution are presented. The performance improvements are achieved by applying distributed Raman amplification (DRA) and a digital high-pass filter. We report on temperature measurements over sensing distances of 75 km and 100 km both with a 12.5-m spatial resolution. Temperature changes of 5 ° C have been measured along 75 km sensing fiber. A temperature change of 30 ° C has been detected at 99.5 km.
我们首次展示了一种 100 公里的布里渊光频域分析（BOFDA），采用了 200 公里的光纤环。与我们之前的出版物相比，本文展示了更长的传感器长度、更高的传感器精度和空间分辨率。通过应用分布式 Raman 放大（DRA）和数字高通滤波器，实现了性能的提升。我们报告了在 75 公里和 100 公里的传感距离上的温度测量结果，空间分辨率均为 12.5 米。在 75 公里的传感光纤上，我们测量到了 5°C 的温度变化。在 99.5 公里处，我们检测到了 30°C 的温度变化。
