Dynamic distributed Brillouin sensing based on pump frequency-agile quadrupling modulation

被引：0
|
作者：
Bai, Xueqian [1 ]
Wang, Wenrui [1 ,2 ]
Zhou, Biying [1 ]
Hu, Jun [1 ]
Wang, Ruoqi [1 ]
Ye, Lingyun [1 ,2 ]
Song, Kaichen [1 ,2 ]
机构：
[1] Zhejiang Univ, Hangzhou 310027, Peoples R China
[2] Huanjiang Lab, Zhuji 311800, Peoples R China
来源：
OPTICAL FIBER TECHNOLOGY | 2024年 / 88卷
关键词：
distributed Brillouin optical fiber sensor; Dynamic measurement; Frequency-agility; Strain measurement; STRAIN-MEASUREMENT; FIBER SENSOR; BOTDA;
D O I：
10.1016/j.yofte.2024.103979
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：
We propose a dynamic distributed Brillouin sensing based on a frequency-agile quadrupling method. A common low-bandwidth direct digital frequency synthesizer (DDS) is employed to generate a few hundred MHz of frequency-agile pump pulses for Brillouin gain spectrum (BGS) scanning, and polarization multiplexing technology is utilized to further decrease the bandwidth requirement for the frequency-agile microwave signal to one-quarter. This method has low requirements for electronic devices and significantly reduces costs in systems. Static and dynamic measurement capabilities of 2 km fiber were demonstrated experimentally, the vibration frequencies of 183 Hz were measured with a sampling rate of 400 Sa/s.
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页数：7
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