Additive non-uniform random sampling in superimposed fiber Bragg grating strain gauge

作者：Y C, H Y Liu, S B Yan, Yuanhong Yang, M W Yang, J M Li, Jian Tang · 发表于：Measurement Science and Technology · 年份：2013 · DOI：10.1088/0957-0233/24/5/055201 · 被引用次数：2 · 研究领域：Advanced Fiber Optic Sensors、Photonic and Optical Devices、Advanced MEMS and NEMS Technologies

This paper demonstrates an additive non-uniform random sampling and interrogation method for dynamic and/or static strain gauge using a reflection spectrum from two superimposed fiber Bragg gratings (FBGs). The superimposed FBGs are designed to generate non-equidistant space of a sensing pulse train in the time domain during dynamic strain gauge. By combining centroid finding with smooth filtering methods, both the interrogation speed and accuracy are improved. A 1.9 kHz dynamic strain is measured by generating an additive non-uniform randomly distributed 2 kHz optical sensing pulse train from a mean 500 Hz triangular periodically changing scanning frequency.