Distributed Temperature and Strain Discrimination with Stimulated Brillouin Scattering and Rayleigh Backscatter in an Optical FiberReportar como inadecuado




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Department of Physics, University of Ottawa, Ottawa, ON K1N 6N5, Canada





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Abstract A distributed optical fiber sensor with the capability of simultaneously measuring temperature and strain is proposed using a large effective area non-zero dispersion shifted fiber LEAF with sub-meter spatial resolution. The Brillouin frequency shift is measured using Brillouin optical time-domain analysis BOTDA with differential pulse-width pair technique, while the spectrum shift of the Rayleigh backscatter is measured using optical frequency-domain reflectometry OFDR. These shifts are the functions of both temperature and strain, and can be used as two independent parameters for the discrimination of temperature and strain. A 92 m measurable range with the spatial resolution of 50 cm is demonstrated experimentally, and accuracies of ±1.2 °C in temperature and ±15 με in strain could be achieved. View Full-Text

Keywords: optical fiber sensors; temperature and strain discrimination; stimulated Brillouin scattering; Rayleigh scattering optical fiber sensors; temperature and strain discrimination; stimulated Brillouin scattering; Rayleigh scattering





Autor: Da-Peng Zhou * , Wenhai Li, Liang Chen and Xiaoyi Bao

Fuente: http://mdpi.com/



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