A Modified Demodulation Algorithm for Fiber-Optic Distributed Temperature Sensing System Based on Raman Scattering

被引：0
作者：
Xia, Tao [1 ]
Guo, Jiangtao [1 ]
Li, Xiaobing [1 ]
Mao, Xin [1 ]
机构：
[1] Yangtze Opt Fibre & Cable Co Ltd, State Key Lab Opt Fiber & Cable Manufacture Techn, R&D Ctr, Wuhan 430073, Peoples R China
来源：
2012 PHOTONICS GLOBAL CONFERENCE (PGC) | 2012年
关键词：
demodulation algorithm; wavelet domain denoising; Raman scattering; iteration technique Introduction; SENSOR; LIGHT;
D O I：
暂无
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
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 degrees 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 degrees C is achieved on a whole fiber of 8 km.
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