Open AccessDiscrimination between strain and temperature by cascading single-mode thin-core diameter fibers
Author(s) -
Jie Shi,
Shilin Xiao,
Miehua Bi,
Lilin Yi,
Pei Yang
Publication year - 2012
Publication title -
applied optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.668
H-Index - 197
eISSN - 2155-3165
pISSN - 1559-128X
DOI - 10.1364/ao.51.002733
Subject(s) - materials science , strain (injury) , optics , sensitivity (control systems) , core (optical fiber) , optical fiber , atmospheric temperature range , temperature measurement , astronomical interferometer , fabrication , fiber optic sensor , fiber , optoelectronics , interferometry , composite material , physics , electronic engineering , medicine , alternative medicine , pathology , quantum mechanics , meteorology , engineering
A simple fiber-optic sensor capable of discrimination between temperature and strain is proposed and experimentally demonstrated. The sensor head is formed by cascading two sections of single-mode thin-core diameter fibers (TCFs) that act as two different inter-modal interferometers (IMIs). Due to the different sensitivity responses of the two IMIs to strain and temperature, it is possible to discriminate temperature and strain by monitoring the resonant wavelength shifts. The experimental results indicate that the measured strain and temperature resolutions are 37.41 με and 0.732 °C within a strain range of 0-1333.3 με and a temperature range from 26.9 °C to 61.7 °C. The sensing sensitivities of strain and temperature are -1.03 pm/με and 30.74 pm/°C, respectively. The proposed sensor features the advantages of easy fabrication, low cost and high sensitivity, and it exhibits great potential in dual-parameter measurement.
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