Yafeng Cheng , Hanyong Wang , Changpeng Ming , Lei Qian , Desheng Li , Hongyi Gan , Tianye Huang , Wu Liu , Ming Luo , Lei Dong , Xiang Li
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引用次数: 0
Abstract
In this paper, frequency-modulated dual-pulse probe is utilized to achieve quantitative demodulation of external vibrations in phase-sensitive optical time-domain reflectometry (Φ-OTDR) with direct detection. In the proposed scheme, only a single acousto-optic modulator (AOM) is required to simultaneously generate the dual-pulse with four different frequencies spacing at 2.5 MHz. In the experiment, the vibrations from 0.1 Hz to 2000 Hz can be successfully recovered with 12.2 m spatial resolution at sampling rate of only 10 MHz. The proposed method is capable of quantitative demodulation of vibrations in wide frequency range, showing potential applications in the area of cost-effective distributed acoustic sensing.
期刊介绍：
Optics Communications invites original and timely contributions containing new results in various fields of optics and photonics. The journal considers theoretical and experimental research in areas ranging from the fundamental properties of light to technological applications. Topics covered include classical and quantum optics, optical physics and light-matter interactions, lasers, imaging, guided-wave optics and optical information processing. Manuscripts should offer clear evidence of novelty and significance. Papers concentrating on mathematical and computational issues, with limited connection to optics, are not suitable for publication in the Journal. Similarly, small technical advances, or papers concerned only with engineering applications or issues of materials science fall outside the journal scope.
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