Department of Electrical and Computer Engineering, University of Pittsburgh, Pittsburgh, PA, 15260, USA.
National Energy Technology Laboratory, 626 Cochrans Mill Road, Pittsburgh, PA, 15236, USA.
Sci Rep. 2017 Aug 24;7(1):9360. doi: 10.1038/s41598-017-09934-3.
This paper reports a technique to enhance the magnitude and high-temperature stability of Rayleigh back-scattering signals in silica fibers for distributed sensing applications. With femtosecond laser radiation, more than 40-dB enhancement of Rayleigh backscattering signal was generated in silica fibers using 300-nJ laser pulses at 250 kHz repetition rate. The laser-induced Rayleigh scattering defects were found to be stable from the room temperature to 800 °C in hydrogen gas. The Rayleigh scatter at high temperatures was correlated to the formation and modification of nanogratings in the fiber core. Using optical fibers with enhanced Rayleigh backscattering profiles as distributed temperature sensors, we demonstrated real-time monitoring of solid oxide fuel cell (SOFC) operations with 5-mm spatial resolution at 800 °C. Information gathered by these fiber sensor tools can be used to verify simulation results or operated in a process-control system to improve the operational efficiency and longevity of SOFC-based energy generation systems.
本文报道了一种用于分布式传感应用的技术，可增强光纤中瑞利背向散射信号的幅度和高温稳定性。使用飞秒激光辐射，在 250 kHz 重复率下使用 300nJ 激光脉冲，在石英光纤中产生了超过 40dB 的瑞利背向散射信号增强。在氢气中，从室温到 800°C 发现激光诱导的瑞利散射缺陷是稳定的。高温下的瑞利散射与光纤芯中纳米光栅的形成和修饰有关。使用具有增强的瑞利背向散射轮廓的光纤作为分布式温度传感器，我们在 800°C 下以 5mm 的空间分辨率实时监测固体氧化物燃料电池 (SOFC) 的运行情况。这些光纤传感器工具收集的信息可用于验证模拟结果或在过程控制系统中运行，以提高基于 SOFC 的发电系统的运行效率和寿命。
