| 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. |
| Language: | English |
| 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. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| b24268768.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 2.37 MB | Adobe PDF | View/Open |
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