Simultaneous measurement of temperature and pressure using single fiber Bragg grating and fixed filter demodulation technique

Luiz C. S. Nunes; L. C. G. Valente; R. W. A. Llerena; Arthur M.B. Braga; A. L. C. Triques

doi:10.1117/12.591631

21 October 2004 Simultaneous measurement of temperature and pressure using single fiber Bragg grating and fixed filter demodulation technique

Luiz C. S. Nunes, L. C. G. Valente, R. W. A. Llerena, Arthur M.B. Braga, A. L. C. Triques

Author Affiliations +

Proceedings Volume 5622, 5th Iberoamerican Meeting on Optics and 8th Latin American Meeting on Optics, Lasers, and Their Applications; (2004) https://doi.org/10.1117/12.591631
Event: 5th Iberoamerican Meeting on Optics and 8th Latin American Meeting on Optics, Lasers, and Their Applications, 2004, Porlamar, Venezuela

Abstract

Fiber Bragg grating (FBG) sensors offer many advantages for monitoring strain and temperature, other physical parameters can be measured through the use of mechanical transducers. However, FBGs are sensitive to strain and temperature and, in many cases, it is difficult to discrminate both measurements. To overcome this problem several techniques have been proposed, most of them employing more than one grating. This work demonstrates the possibility to discriminate temperature and pressure measurements using only one FBG sensor and a low cost demodulation technique based on two fixed filters. A pressure transducer has been used to transfer a lateral force to the fiber, proportional to the applied pressure, generating birefringence in the Bragg grating. The system allowed to measure pressure in the range of 0 to 400 psi with uncertainty of 4 psi and, simultaneously, measure temperature in a range of 22°C with uncertainty of 0.1°C.

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Luiz C. S. Nunes, L. C. G. Valente, R. W. A. Llerena, Arthur M.B. Braga, and A. L. C. Triques "Simultaneous measurement of temperature and pressure using single fiber Bragg grating and fixed filter demodulation technique", Proc. SPIE 5622, 5th Iberoamerican Meeting on Optics and 8th Latin American Meeting on Optics, Lasers, and Their Applications, (21 October 2004); https://doi.org/10.1117/12.591631

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