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Optical Engineering

Optimal wavelength pair selection and accuracy analysis of dual fiber grating sensors for simultaneously measuring strain and temperature
Author(s): Ponniah Sivanesan; James S. Sirkis; Yorinobu Murata; Steven G. Buckley
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Paper Abstract

We investigate the wavelength selection of dual fiber grating sensors for strain and temperature measurements. Temperature and strain coefficients of fiber gratings are measured in the wavelength range of 600 to 1600 nm in Corning Flexcor-980TM fiber. Theoretical fits are estimated using Ghosh's temperature-dependent refractive index model for optical fiber glasses. Moreover, the effect of apparent thermal strain due to the structural thermal expansion on the temperature coefficient in a surface-bonded fiber grating sensor is investigated, and numerical results for the accuracy of temperature and strain are presented. It is shown that the structural thermal properties have a large influence on the resolution and measurement accuracy of dual fiber grating sensors.

Paper Details

Date Published: 1 October 2002
PDF: 8 pages
Opt. Eng. 41(10) doi: 10.1117/1.1505638
Published in: Optical Engineering Volume 41, Issue 10
Show Author Affiliations
Ponniah Sivanesan, Univ. of Maryland/College Park (United States)
James S. Sirkis, CIDRA Corp. (United States)
Yorinobu Murata, Wakayama Univ. (Japan)
Steven G. Buckley, Univ. of Maryland/College Park (United States)

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