Distributed Temperature and Strain Discrimination with Stimulated Brillouin Scattering and Rayleigh Backscatter in an Optical Fiber

Sensors

Da-Peng Zhou¹  Wenhai Li²  Liang Chen² 

[1] Department of Physics, University of Ottawa, Ottawa, ON K1N 6N5, Canada;

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

DOI  :  10.3390/s130201836

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.