Interference Fading Suppression for Multi-frequency φ-OTDR

被引：0
|
作者：
Wang, Yu [1 ,2 ]
Wang, Junhong [2 ]
Liang, Bin [1 ]
Li, Yan [2 ]
Bai, Qing [1 ,2 ]
Jin, Baoquan [1 ,2 ]
机构：
[1] Shanxi Transportat Technol Res & Dev Co Ltd, Taiyuan, Peoples R China
[2] Taiyuan Univ Technol, Minist Educ & Shanxi Prov, Key Lab Adv Transducers & Intelligent Control Sys, Taiyuan, Peoples R China
来源：
2022 IEEE 7TH OPTOELECTRONICS GLOBAL CONFERENCE, OGC | 2022年
基金：
中国国家自然科学基金;
关键词：
distributed optical fiber sensing; F-OTDR; interference fading suppression; data alignment; SENSOR; PULSE;
D O I：
10.1109/OGC55558.2022.10051074
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：
In phase-sensitive optical time domain reflectometer (Phi-OTDR), due to interference fading, the intensity of Rayleigh backward scattering (RBS) signals may be close to zero at the fading position and submerged in noise, resulting in the abnormal demodulated phase of vibration signal. In this paper, a multi-frequency phi-OTDR is proposed for the interference fading suppression. Three acousto-optical modulators (AOMs) are used to generate multi-frequency probe pulses. Data alignment processing is carried to ensure the consistency of multi-frequency beat signals. Rotated-vector-sum method is adopted to aggregate multi-frequency signals. Experimental results show that with the help of data alignment processing, the fading probability of aligned curve can be reduced to 1.90%, and the SNR of positioning curve can reach 16.03dB.
引用
收藏
页码：137 / 141
页数：5
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