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Optical Engineering

Simultaneous measurement of strain and temperature using interferometrically interrogated fiber Bragg grating sensors
Author(s): Luis Alberto Almeida Ferreira; Francisco M. Araujo; Jose Luis Santos; Faramarz Farahi
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Paper Abstract

The potential of different fiber Bragg grating pairs for simultaneous sensing of strain and temperature is analyzed. We demonstrate that interferometric interrogation of a fiber grating written in bow-tie fiber enables strain and temperature to be simultaneously determined. This is achieved by independent measurement of the shift in the wavelengths of the reflected light from the grating components along the fast and the slow axes of the hi-bi fiber. A detailed theoretical analysis is presented that includes the basic sensing principle, sensor design and demodulation scheme. The performance of the proposed technique in simultaneous measurement of temperature and strain is experimentally demonstrated and resolutions of ± 2.5° c/?Hz and ± 26 ??/?Hz are obtained for a fiber with birefringence of B = 5.5x 10-4.

Paper Details

Date Published: 1 August 2000
PDF: 9 pages
Opt. Eng. 39(8) doi: 10.1117/1.1305493
Published in: Optical Engineering Volume 39, Issue 8
Show Author Affiliations
Luis Alberto Almeida Ferreira, Instituto de Engenharia de Sistemas Compuadores (Portugal)
Francisco M. Araujo, Instituto de Engenharia de Sistemas e Computadores (Portugal)
Jose Luis Santos, Instituto de Engenharia de Sistemas e Computadores (Portugal)
Faramarz Farahi, Univ. of North Carolina/Charlotte (United States)

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