A modified demodulation algorithm for fiber-optic distributed temperature sensing system based on raman scattering

Author

Tao Xia ; Jiangtao Guo ; Xiaobing Li ; Xin Mao

Author_Institution

State Key Lab. of Opt. Fiber & Cable Manuf. Technol., Yangtze Opt. Fibre & Cable Co. Ltd., Wuhan, China

fYear

2012

fDate

13-16 Dec. 2012

Firstpage

1

Lastpage

3

Abstract

A modified demodulation algorithm in the fiber-optic distributed temperature sensing system base on Raman scatter is introduced. It is a combination of wavelet domain denoising and iteration technique which rises the signal to noise ratio(SNR) of the raw data and finely compensate the attenuation difference between Stokes and Anti-Stokes wavelength of the sensing fiber. A 8 km conventional OM1 fiber is used as the temperature sensing fiber and the raw data of demodulated temperature is processed by the wavelet domain denoising method, which enhanced the temperature resolution from 8.0 to 1.0°C in the fiber end, where we got the worst SNR. Further the attenuation difference between the Stokes and Anti-Stokes wavelength is finely compensated by a iteration of 8 times and a temperature resolution of 0.1°C is achieved on a whole fiber of 8 km.

Keywords

Raman spectra; distributed sensors; fibre optic sensors; iterative methods; temperature sensors; Anti-Stokes wavelength; Raman scattering; fiber-optic distributed temperature sensing system; iteration technique; modified demodulation algorithm; signal to noise ratio; wavelet domain denoising; Demodulation; Optical fiber cables; Optical fiber sensors; Optical fibers; Temperature distribution; Temperature sensors; Raman scattering; demodulation algorithm; iteration technique Introduction; wavelet domain denoising;

fLanguage

English

Publisher

ieee

Conference_Titel

Photonics Global Conference (PGC), 2012

Conference_Location

Singapore

Print_ISBN

978-1-4673-2513-4

Type

conf

DOI

10.1109/PGC.2012.6458071

Filename

6458071