23 May 2005 Novel technique for the simultaneous measurement of strain and temperature using polarization maintaining fiber Bragg gratings
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Proceedings Volume 5855, 17th International Conference on Optical Fibre Sensors; (2005) https://doi.org/10.1117/12.623419
Event: 17th International Conference on Optical Fibre Sensors, 2005, Bruges, Belgium
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.
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C. Caucheteur, F. Lhomme, K. Chah, M. Blondel, Patrice Megret, "Novel technique for the simultaneous measurement of strain and temperature using polarization maintaining fiber Bragg gratings", Proc. SPIE 5855, 17th International Conference on Optical Fibre Sensors, (23 May 2005); doi: 10.1117/12.623419; https://doi.org/10.1117/12.623419
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