首页|Performance improvement method of single-ended BOTDA system based on Fresnel reflection
Performance improvement method of single-ended BOTDA system based on Fresnel reflection
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To solve the problems of small signal intensity and low signal-to-noise ratio(SNR)in single-ended Brillouin optical time domain analysis(BOTDA)system based on Fresnel reflection,we propose and experimentally demonstrate a pulse coding single-ended BOTDA system,which can improve the SNR and temperature measurement accuracy.A single-ended BOTDA temperature sensing system using single pulse and pulse coding is designed,and the Brillouin time domain signal and Brillouin frequency shift under different pulse coding bits are measured.The experimental re-sults show that the fluctuations of Brillouin power and Brillouin frequency shift are gradually decreased with the in-crease of pulse coding bits,and the SNR under 32 bit Golay coding offers a 6.18 dB improvement with respect to tradi-tional single pulse system.And the temperature measurement accuracy under 32 bit coding over a 9.35-km-long sen-sing fiber can be accurately measured as 1.59℃,while providing a 1.73℃enhancement when compared to single pulse system.
ZHANG Lixin、LI Yongqian、TIAN Min、LI Tian
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Department of Electronic and Communication Engineering,North China Electric Power University,Baoding 071003,China
Hebei Key Laboratory of Power Internet of Things Technology,North China Electric Power University,Baoding 071003,China
Department of Computer,North China Electric Power University,Baoding 071003,China
河北省自然科学基金国家自然科学基金Fundamental Research Funds for the Central Universities
NETL
NSTL
万方数据
维普
