Distributed vibration measurement based on a coherent multi-slope-assisted BOTDA with a large dynamic range

We propose a novel technique to enhance the dynamic range of a coherent slope-assisted Brillouin optical time domain analysis. A multi-tone probe and a reference wave are launched into the fiber under test (FUT); after interacting with the pump pulse, the Brillouin gain, as well as the Brillouin pha...

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Published in:Optics letters 2019-03, Vol.44 (5), p.1245-1248
Main Authors: Zheng, Hua, Feng, Danqi, Zhang, Jingdong, Zhu, Tao, Bai, Yongzhong, Qu, Dingrong, Huang, Xianbin, Qiu, Feng
Format: Article
Language:English
Subjects:
Dynamic range
Spatial resolution
Time domain analysis
Vibration measurement
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cited_by cdi_FETCH-LOGICAL-c319t-d648cff0ef97843ff47b874095c346ae747cec6ddc20358761d7389559519f863
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container_issue 5
container_start_page 1245
container_title Optics letters
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creator Zheng, Hua
Feng, Danqi
Zhang, Jingdong
Zhu, Tao
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Qu, Dingrong
Huang, Xianbin
Qiu, Feng
description We propose a novel technique to enhance the dynamic range of a coherent slope-assisted Brillouin optical time domain analysis. A multi-tone probe and a reference wave are launched into the fiber under test (FUT); after interacting with the pump pulse, the Brillouin gain, as well as the Brillouin phase shift of each tone, can be demodulated simultaneously. In light of this, the strain information can be determined by the Brillouin phase-gain ratio of each tone. In the experiment, a three-tone probe with a 60 MHz interval is used; effective measurement frequency span larger than 180 MHz is verified in a ∼2  km single-mode fiber with 2.5 m spatial resolution and 1.5 kHz sampling rate to strain. A vibration signal with 41 Hz frequency and 2546 με amplitude is successfully demodulated.
doi_str_mv 10.1364/OL.44.001245
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subjects Dynamic range
Spatial resolution
Time domain analysis
Vibration measurement
title Distributed vibration measurement based on a coherent multi-slope-assisted BOTDA with a large dynamic range
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