Simultaneous temperature and strain measurement with bandwidth and peak of the Brillouin spectrum in LEAF fiber

Xuan Liu; Xiaoyi Bao

doi:10.1117/12.887441

17 May 2011 Simultaneous temperature and strain measurement with bandwidth and peak of the Brillouin spectrum in LEAF fiber

Xuan Liu, Xiaoyi Bao

Author Affiliations +

Proceedings Volume 7753, 21st International Conference on Optical Fiber Sensors; 775328 (2011) https://doi.org/10.1117/12.887441
Event: 21st International Conference on Optical Fibre Sensors (OFS21), 2011, Ottawa, Canada

Abstract

Leaf fiber's Brillouin gain spectrum characteristics such as peak power and line-width are studied under different strain and temperature conditions. We compared these results with those of SMF and explained the similarities and differences. They are attributed to the dependence of refractive index, density, acoustic velocity, effective length and effective area on strain and temperature. Besides the acoustic waveguide structure is also applied to explain the different behaviors of LEAF and SMF. Based on the linear relationships between the four peaks' line-width and strain/temperature the strain and temperature errors of using each peak's Brillouin frequency shift and line-width are calculated. We achieved a strain error of 36.91με and a temperature error of 1.84°C with a spatial resolution of 4m. This provides another way of measuring the temperature and strain simultaneously using LEAF fiber's bandwidth and peak frequency.

Citation Download Citation

Xuan Liu and Xiaoyi Bao "Simultaneous temperature and strain measurement with bandwidth and peak of the Brillouin spectrum in LEAF fiber", Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 775328 (17 May 2011); https://doi.org/10.1117/12.887441

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