Optical Brillouin fiber sensor system

Pao Yue-kong Library Electronic Theses Database

Optical Brillouin fiber sensor system

 

Author: Wang, Xue
Title: Optical Brillouin fiber sensor system
Degree: M.Sc.
Year: 2011
Subject: Hong Kong Polytechnic University -- Dissertations
Brillouin scattering
Department: Faculty of Engineering
Pages: viii, 56 p. : ill. (some col.) ; 30 cm.
InnoPac Record: http://library.polyu.edu.hk/record=b2426876
URI: http://theses.lib.polyu.edu.hk/handle/200/6059
Abstract: In this project, we attempt to improve the performance of a optical fiber sensor system based on stimulated Brillouin scattering, in particular the focus has been on enhancing the SNR (signal-to-noise radio) of the detected signal. This is realized through the combined use of the Brillouin loss mode and π-phase pulse has been introduced in the sensing system. In the dissertation, an optical fiber Brillouin sensor system based on the Brillouin loss mode is presented. The temperature and strain along the sensing fiber are obtained by measuring the Brillouin intensity and frequency shift, using Brillouin optical time domain analysis technique (BOTDA). Various techniques for realizing high spatial resolution Brillouin sensor have been studied. For enhancing the signal to noise ratio (SNR), the pulse coding is employed. This enables can higher measurement accuracy. Using this technique, experimental result has demonstrated its the ability of improving the spatial resolution of the sensing system which can achieve up to the centimeter level.

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