Open AccessMultimode fiber laser for simultaneous measurement of strain and temperature based on beat frequency demodulation
Author(s) -
Liang Gao,
Lin Chen,
Long Huang,
Xiangfei Chen
Publication year - 2012
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.022517
Subject(s) - multi mode optical fiber , optics , demodulation , beat (acoustics) , materials science , fiber laser , laser , fiber optic sensor , polarization maintaining optical fiber , fiber bragg grating , optical fiber , physics , telecommunications , computer science , channel (broadcasting)
A multimode fiber laser sensor system for simultaneous measurement of strain and temperature is proposed and demonstrated. Because of the long cavity and birefringence, longitudinal mode beat frequency and polarization mode beat frequency are achieved in the beat frequency signals of the multimode fiber laser. The strain and temperature can be obtained by monitoring both of them for their different strain and temperature responses. The experimental measurement errors are within ± 16.2 με and ± 1.9 °C. The usage of only one fiber laser and one demodulation system makes the system simple, cost-effective and portable.