Open AccessHigh-resolution fiber Bragg grating based transverse load sensor using microwave photonics filtering technique
Author(s) -
Yiping Wang,
Ming Wang,
Wei Xia,
Xiaoqi Ni
Publication year - 2016
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.017960
Subject(s) - fiber bragg grating , optics , materials science , fiber optic sensor , photonics , transverse plane , beam splitter , band stop filter , optical fiber , sensitivity (control systems) , filter (signal processing) , optoelectronics , physics , laser , electronic engineering , low pass filter , structural engineering , computer science , computer vision , engineering
In this paper, a new fiber Bragg grating (FBG) sensor exploiting microwave photonics filter technique for transverse load sensing is firstly proposed and experimentally demonstrated. A two-tap incoherent notch microwave photonics filter (MPF) based on a transverse loaded FBG, a polarization beam splitter (PBS), a tunable delay line (TDL) and a length of dispersion compensating fiber (DCF) is demonstrated. The frequency response of the filter with respect to the transverse load is studied. By detecting the resonance frequency shifts of the notch MPF, the transverse load can be determined. The theoretical and experimental results show that the proposed FBG sensor has a higher resolution than traditional methods based on optical spectrum analysis. The sensitivity of the sensor is measured to be as high as 2.5 MHz/N for a sensing fiber with a length of 18mm. Moreover, the sensitivity can be easily adjusted.