FIBER OPTICS

Optimal wavelength pair selection and accuracy analysis of dual fiber grating sensors for simultaneously measuring strain and temperature

[+] Author Affiliations
Ponniah Sivanesan

University of Maryland, Department of Mechanical Engineering, College Park, Maryland?20742

James S. Sirkis

CiDRA Corporation, 50 Barnes Park North, Wallingford, Connecticut?06492

Yorinobu Murata

Wakayama University, Department of Opto-Mechatronics, 930 Wakayama-shi, 640-8510, Japan

Steven G. Buckley

University of Maryland, Department of Mechanical Engineering, College Park, Maryland?20742 E-mail: buckley@eng.umd.edu

Opt. Eng. 41(10), 2456-2463 (Oct 01, 2002). doi:10.1117/1.1505638
History: Received Dec. 14, 2001; Revised Mar. 6, 2002; Accepted Mar. 7, 2002; Online September 20, 2002
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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-980™ 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. © 2002 Society of Photo-Optical Instrumentation Engineers.

© 2002 Society of Photo-Optical Instrumentation Engineers

Topics

Matrices ; Sensors

Citation

Ponniah Sivanesan ; James S. Sirkis ; Yorinobu Murata and Steven G. Buckley
"Optimal wavelength pair selection and accuracy analysis of dual fiber grating sensors for simultaneously measuring strain and temperature", Opt. Eng. 41(10), 2456-2463 (Oct 01, 2002). ; http://dx.doi.org/10.1117/1.1505638


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