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Paper Abstract and Keywords
Presentation 2021-10-14 13:00
[Poster Presentation] Strain dynamic range extension in slope-assisted BOCDR based on down-conversion of Brillouin frequency shift
Haruki Sasage, Mana Sakamoto (SIT), Kohei Noda (Tokyo Tech/YNU), Kentaro Nakamura (Tokyo Tech), Yosuke Mizuno (YNU), Heeyoung Lee (SIT) OFT2021-36
Abstract (in Japanese) (See Japanese page) 
(in English) Brillouin optical correlation-domain reflectometry (BOCDR) is known as a distributed strain and temperature sensing technique with numerous merits including single-end operation, high spatial resolution, random accessibility, and cost efficiency. To boost the operation speed of BOCDR, a frequency-sweeping-free configuration called slope-assisted BOCDR was developed, which enabled real-time operation at the cost of limited strain dynamic range. In addition, use of an electrical spectrum analyzer (ESA) degraded the system size and cost. In this work, we develop a new method for obtaining the strain information by (1) beating down of the Brillouin gain spectrum (BGS), (2) directing the BGS to a low-pass filter, and (3) measuring the power of the electrical output from the low-pass filter. This system does not include an ESA, and in addition, the strain dynamic range is expected to be doubled. Herein, in the case of full-length measurement (not distributed measurement), basic operation of this system is demonstrated with enhanced strain dynamic range.
Keyword (in Japanese) (See Japanese page) 
(in English) Optical fiber sensors / Brillouin scattering / Distributed measurement / Correlation-domain techniques / Beating down / Low-pass filters / Strain dynamic range /  
Reference Info. IEICE Tech. Rep., vol. 121, no. 199, OFT2021-36, pp. 59-62, Oct. 2021.
Paper # OFT2021-36 
Date of Issue 2021-10-07 (OFT) 
ISSN 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)
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Conference Information
Committee OFT  
Conference Date 2021-10-14 - 2021-10-15 
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 2021-10-OFT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Strain dynamic range extension in slope-assisted BOCDR based on down-conversion of Brillouin frequency shift 
Sub Title (in English)  
Keyword(1) Optical fiber sensors  
Keyword(2) Brillouin scattering  
Keyword(3) Distributed measurement  
Keyword(4) Correlation-domain techniques  
Keyword(5) Beating down  
Keyword(6) Low-pass filters  
Keyword(7) Strain dynamic range  
1st Author's Name Haruki Sasage  
1st Author's Affiliation Shibaura Institute of Technology (SIT)
2nd Author's Name Mana Sakamoto  
2nd Author's Affiliation Shibaura Institute of Technology (SIT)
3rd Author's Name Kohei Noda  
3rd Author's Affiliation Tokyo Institute of Technology/Yokohama National University (Tokyo Tech/YNU)
4th Author's Name Kentaro Nakamura  
4th Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
5th Author's Name Yosuke Mizuno  
5th Author's Affiliation Yokohama National University (YNU)
6th Author's Name Heeyoung Lee  
6th Author's Affiliation Shibaura Institute of Technology (SIT)
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Speaker Author-1 
Date Time 2021-10-14 13:00:00 
Presentation Time 80 minutes 
Registration for OFT 
Paper # OFT2021-36 
Volume (vol) vol.121 
Number (no) no.199 
Page pp.59-62 
Date of Issue 2021-10-07 (OFT) 

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