解调
光时域反射计
光学
波形
外差(诗歌)
反射计
外差探测
分布式声传感
光纤传感器
光纤
相位噪声
动态范围
相(物质)
噪音(视频)
物理
时域
声学
保偏光纤
计算机科学
电信
频道(广播)
人工智能
激光器
计算机视觉
电压
图像(数学)
量子力学
作者
Xiangge He,Shangran Xie,Fei Liu,Shan Cao,Lijuan Gu,Xiaoping Zheng,Min Zhang
出处
期刊:Optics Letters
[The Optical Society]
日期:2017-01-19
卷期号:42 (3): 442-442
被引量:123
摘要
We demonstrate a novel type of distributed optical fiber acoustic sensor, with the ability to detect and retrieve actual temporal waveforms of multiple vibration events that occur simultaneously at different positions along the fiber. The system is realized via a dual-pulse phase-sensitive optical time-domain reflectometry, and the actual waveform is retrieved by heterodyne phase demodulation. Experimental results show that the system has a background noise level as low as 8.91×10-4 rad/√Hz with a demodulation signal-to-noise ratio of 49.17 dB at 1 kHz, and can achieve a dynamic range of ∼60 dB at 1 kHz (0.1 to 104 rad) for phase demodulation, as well as a detection frequency range from 20 Hz to 25 kHz.
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