A new distributed microstructure optical fber (DMOF) and a distributed acoustic sensing technology based on the DMOF are introduced in this paper. The DMOF is a new type of longitudinal microstructure fber formed by continuously preparing microstructure scattering unit in the core of ordinary communication optical fber through precise lithography technology. The microstructure-fber distributed acoustic sensor (MFDAS) based on this new type of DMOF has superior performance such as high sensitivity,large monitoring scale and wide frequency response. The key technologies and research progress of the MF-DAS are introduced in this paper, including that the signal-to-noise ratio of the MF-DAS sensing signal is increased by enhancing the microstructure light scattering, the near-far-end signal difference of the MF-DAS is reduced by the microstructure fber link equalization, and the response broadband of detectable distributed sound-wave is improved signifcantly by the microstructure optical time domain reflection (M-OTDR) and the time slot multiplexing of microstructure optical time domain reflection. The new MF-DAS features with large-scale, high-sensitivity and broad response bandwidth in the acquisition of sound wave information, and shows a very broad application prospect in the injury detection of critical infrastructure and the security monitoring of external intrusion.
LIU Deming, HE Tao, XU Zhijie, SUN Qizhen
. New Type of Microstructure-Fiber Distributed Acoustic Sensing Technology and Its Applications[J]. Journal of Applied Sciences, 2020
, 38(2)
: 296
-309
.
DOI: 10.3969/j.issn.0255-8297.2020.02.006
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