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Paper Abstract and Keywords
Presentation 2020-11-13 16:10
Commercialization of real-time distributed acoustic fiber optic sensing (DAS) utilizing chirped pulse
Kinzo Kishida, Artur Guzik, Li Ttken, Nishiguchi Kenichi, Daiji Azuma (Neubrex), Qingwen Liu, Zuyuan He (SJTU) OFT2020-44
Abstract (in Japanese) (See Japanese page) 
(in English) Distributed Acoustic Sensing (DAS) in optical fibers detects dynamic strain or sound waves by measuring the phase change of the scattered light. This contrasts with other distributed and more conventional methods such as distributed temperature (DTS) or strain (DSS) which measure those quasi-static physical quantities such as from the intensity spectrum of the scattered light. DAS is attracting considerable attention as it complements the conventional distributed measurement. In order to implement DAS in commercial applications, it is necessary to ensure sufficiently high signal-noise ratio (SNR) for scattered light detection, suppress its deterioration along the sensing fiber, and moreover to perform high-speed processing within milliseconds or less. In this report, we present new real-time DAS realized by using the TGD-OFDR (Time Gated Digital-Optical Frequency Domain Reflectometry) method, in which the chirp pulse is divided into overlapping bands. The developed prototype NBX-S4000 generates a chirp signal with a pulse duration of 2 μs and uses frequency sweep of 100 MHz at a repeating frequency of 2 kHz. It allows one to detect sound waves at 10 km fiber distance range with spatial resolution of 2.8 m in real time. The developed prototype was also tested in the field not only in natural earthquakes, submarine cables and oil and gas industry applications, but also in smart city where non-stop monitoring are requested. All obtained results confirmed effectiveness of the method and developed sensing instrument.
Keyword (in Japanese) (See Japanese page) 
(in English) Real time phase DAS / high SNR / Low noise floor / post spatial resolving / non-stop event monitoring / / /  
Reference Info. IEICE Tech. Rep., vol. 120, no. 230, OFT2020-44, pp. 39-44, Nov. 2020.
Paper # OFT2020-44 
Date of Issue 2020-11-05 (OFT) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF OFT2020-44

Conference Information
Conference Date 2020-11-10 - 2020-11-11 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To OFT 
Conference Code 2020-11-OFT-BCT-OCS-CMN 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Commercialization of real-time distributed acoustic fiber optic sensing (DAS) utilizing chirped pulse 
Sub Title (in English)  
Keyword(1) Real time phase DAS  
Keyword(2) high SNR  
Keyword(3) Low noise floor  
Keyword(4) post spatial resolving  
Keyword(5) non-stop event monitoring  
1st Author's Name Kinzo Kishida  
1st Author's Affiliation Neubrex Co., Ltd. (Neubrex)
2nd Author's Name Artur Guzik  
2nd Author's Affiliation Neubrex Co., Ltd. (Neubrex)
3rd Author's Name Li Ttken  
3rd Author's Affiliation Neubrex Co., Ltd. (Neubrex)
4th Author's Name Nishiguchi Kenichi  
4th Author's Affiliation Neubrex Co., Ltd. (Neubrex)
5th Author's Name Daiji Azuma  
5th Author's Affiliation Neubrex Co., Ltd. (Neubrex)
6th Author's Name Qingwen Liu  
6th Author's Affiliation Shanghai Jiao Tong University (SJTU)
7th Author's Name Zuyuan He  
7th Author's Affiliation Shanghai Jiao Tong University (SJTU)
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Speaker Author-1 
Date Time 2020-11-13 16:10:00 
Presentation Time 25 minutes 
Registration for OFT 
Paper # OFT2020-44 
Volume (vol) vol.120 
Number (no) no.230 
Page pp.39-44 
Date of Issue 2020-11-05 (OFT) 

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