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Proceedings Paper

Novel technique for the simultaneous measurement of strain and temperature using polarization maintaining fiber Bragg gratings
Author(s): C. Caucheteur; F. Lhomme; K. Chah; M. Blondel; Patrice Megret
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Paper Abstract

When a short Bragg grating is written into a polarization maintaining fiber, the resonant peaks produced by birefringence can overlap. In this case, the simultaneous measurement of strain and temperature is only possible by means of polarization control devices. To avoid this complexity, we propose a demodulation technique allowing to accurately estimate the resonant wavelengths from the reflected spectrum measured using an unpolarized light. We use this technique to discriminate between strain and temperature effects with a 2 mm long grating written into PANDA fiber. Our method allows real-time functioning. Its accuracy falls within ±2°C and ±12 µε in the ranges 25-90°C and 0-1800 µε, respectively.

Paper Details

Date Published: 23 May 2005
PDF: 4 pages
Proc. SPIE 5855, 17th International Conference on Optical Fibre Sensors, (23 May 2005); doi: 10.1117/12.623419
Show Author Affiliations
C. Caucheteur, Faculte Polytechnique de Mons (Belgium)
F. Lhomme, Faculte Polytechnique de Mons (Belgium)
K. Chah, Faculte Polytechnique de Mons (Belgium)
M. Blondel, Faculte Polytechnique de Mons (Belgium)
Patrice Megret, Faculte Polytechnique de Mons (Belgium)


Published in SPIE Proceedings Vol. 5855:
17th International Conference on Optical Fibre Sensors
Marc Voet; Reinhardt Willsch; Wolfgang Ecke; Julian Jones; Brian Culshaw, Editor(s)

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