SENSORS

Simultaneous measurement of strain and temperature using interferometrically interrogated fiber Bragg grating sensors

[+] Author Affiliations
L. A. Ferreira, Francisco M. Arau´jo

INESC-Porto, Unidade de Tecnologia Optoelectro´nica, Rua do Campo Alegre 687, 4150?Porto, Portugal

Jose´ L. Santos

Departamento de Fi´sica da Universidade do Porto, and INESC-Porto, Unidade de Tecnologia Optoelectro´nica, Rua do Campo Alegre 687, 4150?Porto, Portugal

Faramarz Farahi

University of North Carolina at Charlotte, Physics Department, Charlotte, North Carolina?28223

Opt. Eng. 39(8), 2226-2234 (Aug 01, 2000). doi:10.1117/1.1305493
History: Received May 24, 1999; Revised Jan. 18, 2000; Accepted Feb. 3, 2000
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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 με/Hz are obtained for a fiber with birefringence of B=5.5×10−4. © 2000 Society of Photo-Optical Instrumentation Engineers.

© 2000 Society of Photo-Optical Instrumentation Engineers

Citation

L. A. Ferreira ; Francisco M. Arau´jo ; Jose´ L. Santos and Faramarz Farahi
"Simultaneous measurement of strain and temperature using interferometrically interrogated fiber Bragg grating sensors", Opt. Eng. 39(8), 2226-2234 (Aug 01, 2000). ; http://dx.doi.org/10.1117/1.1305493


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