Huang Jie, Hua Lei, Lan Xinwei, Wei Tao, Xiao Hai
Department of Electrical and Computer Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA.
Opt Express. 2013 Jul 29;21(15):18152-9. doi: 10.1364/OE.21.018152.
This paper reports a distributed fiber optic sensing technique through microwave assisted separation and reconstruction of optical interferograms in spectrum domain. The approach involves sending a microwave-modulated optical signal through cascaded fiber optic interferometers. The microwave signal was used to resolve the position and reflectivity of each sensor along the optical fiber. By sweeping the optical wavelength and detecting the modulation signal, the optical spectrum of each sensor can be reconstructed. Three cascaded fiber optic extrinsic Fabry-Perot interferometric sensors were used to prove the concept. Their microwave-reconstructed interferogram matched well with those recorded individually using an optical spectrum analyzer. The application in distributed strain measurement has also been demonstrated.
本文报道了一种通过微波辅助光谱域光学干涉图的分离与重建实现的分布式光纤传感技术。该方法包括通过级联光纤干涉仪发送微波调制光信号。微波信号用于解析沿光纤每个传感器的位置和反射率。通过扫描光波长并检测调制信号，可以重建每个传感器的光谱。使用三个级联的光纤外腔法布里-珀罗干涉式传感器来验证该概念。它们经微波重建的干涉图与使用光谱分析仪单独记录的干涉图匹配良好。还展示了其在分布式应变测量中的应用。
