Open AccessMicrowave interrogated large core fused silica fiber Michelson interferometer for strain sensing
Author(s) -
Liwei Hua,
Yang Song,
Jie Huang,
Xinwei Lan,
Yanjun Li,
Hai Xiao
Publication year - 2015
Publication title -
applied optics
Language(s) - Uncategorized
Resource type - Journals
ISSN - 0003-6935
DOI - 10.1364/ao.54.007181
Subject(s) - optics , materials science , interferometry , optical fiber , michelson interferometer , core (optical fiber) , photonic crystal fiber , hard clad silica optical fiber , fiber optic sensor , graded index fiber , physics
A Michelson-type large core optical fiber sensor has been developed, which is designed based on the optical carrier-based microwave interferometry technique, and fabricated by using two pieces of 200-μm diameter fused silica core fiber as two arms of the Michelson interferometer. The interference fringe pattern caused by the optical path difference of the two arms is interrogated in the microwave domain, where the fringe visibility of 40 dB has easily been obtained. The strain sensing at both room temperature and high temperatures has been demonstrated by using such a sensor. Experimental results show that this sensor has a linear response to the applied strain, and also has relatively low temperature-strain cross talk. The dopant-free quality of the fused silica fiber provides high possibility for the sensor to have promising strain sensing performance in a high temperature environment.