Lalam Nageswara, Lu Ping, Venketeswaran Abhishek, Buric Michael P
National Energy Technology Laboratory, 626 Cochrans Mill Road, Pittsburgh, PA 15236, USA.
Leidos, 626 Cochrans Mill Road, Pittsburgh, PA 15236, USA.
Sensors (Basel). 2021 Mar 16;21(6):2078. doi: 10.3390/s21062078.
A vibration fiber sensor based on a fiber ring cavity laser and an interferometer based single-mode-multimode-single-mode (SMS) fiber structure is proposed and experimentally demonstrated. The SMS fiber sensor is positioned within the laser cavity, where the ring laser lasing wavelength can be swept to an optimized wavelength using a simple fiber loop design. To obtain a better signal-to-noise ratio, the ring laser lasing wavelength is tuned to the maximum gain region biasing point of the SMS transmission spectrum. A wide range of vibration frequencies from 10 Hz to 400 kHz are experimentally demonstrated. In addition, the proposed highly sensitive vibration sensor system was deployed in a field-test scenario for pipeline acoustic emission monitoring. An SMS fiber sensor is mounted on an 18" diameter pipeline, and vibrations were induced at different locations using a piezoelectric transducer. The proposed method was shown to be capable of real-time pipeline vibration monitoring.
提出并通过实验证明了一种基于光纤环形腔激光器和基于干涉仪的单模-多模-单模（SMS）光纤结构的振动光纤传感器。SMS光纤传感器位于激光腔内，通过简单的光纤环设计可将环形激光器的激射波长扫描到优化波长。为了获得更好的信噪比，将环形激光器的激射波长调谐到SMS传输谱的最大增益区域偏置点。实验证明了该传感器可检测10 Hz至400 kHz的宽范围振动频率。此外，所提出的高灵敏度振动传感器系统被部署在管道声发射监测的现场测试场景中。将一个SMS光纤传感器安装在直径为18英寸的管道上，并使用压电换能器在不同位置诱发振动。结果表明，所提出的方法能够对管道振动进行实时监测。
