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| Presentation | 2026-01-22 13:20 [Poster Presentation] Demonstration of km-range distributed strain sensing using slope-assisted PPRM-BOCDR Takumi Morikawa, Keita Kikuchi, Ryo Inoue (SIT), Yosuke Mizuno (YNU), Heeyoung Lee (SIT)  OFT2025-71 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | Brillouin optical correlation-domain reflectometry (BOCDR) enables quantitative distributed measurements of strain and temperature variations along a fiber under test (FUT) and has attracted considerable attention as a promising technique for structural health monitoring of infrastructures. In standard BOCDR, spatial discrimination is achieved by applying sinusoidal frequency modulation; however, a trade-off exists between the measurement range d_m and the spatial resolution Δz. The effective number of measurement points, defined as the ratio of d_m to Δzand denoted as N_R, is commonly used to evaluate this trade-off and is limited to approximately 580 in standard BOCDR systems. Recently, it has been demonstrated that the use of periodic pseudo-random modulation (PPRM) can significantly relax this trade-off, increasing N_R to over 1000. In addition, in conventional BOCDR, the Brillouin gain spectrum (BGS) is obtained by sweeping the frequency of an electrical spectrum analyzer (ESA), and the Brillouin frequency shift (BFS) is determined from the peak frequency of the BGS. However, the frequency sweep of the ESA has been a bottleneck for high-speed operation. To address this issue, slope-assisted (SA-) BOCDR has been proposed, in which the power variation at a specific frequency on the slope of the BGS is uniquely mapped to the BFS, enabling real-time operation. Although many studies on SA-BOCDR have been reported, SA-BOCDR based on PPRM has not yet been experimentally demonstrated. Combining the advantages of PPRM and SA schemes is expected to realize long-range, high-speed distributed strain and temperature measurements using BOCDR. In this study, we experimentally demonstrate kilometer-range distributed strain measurement using slope-assisted PPRM-BOCDR. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | Optical fiber sensors / Brillouin scattering / slope assisted BOCDR / Periodic pseudo-random modulation / distributed strain sensing / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 125, no. 324, OFT2025-71, pp. 1-5, Jan. 2026. | |
| Paper # | OFT2025-71 | |
| Date of Issue | 2026-01-15 (OFT) | |
| ISSN | Online edition: ISSN 2432-6380 | |
| Copyright and reproduction |
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 | OFT2025-71 |
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| Conference Information | |
| Committee | OFT |
| Conference Date | 2026-01-22 - 2026-01-23 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Paper Information | |
| Registration To | OFT |
| Conference Code | 2026-01-OFT |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Demonstration of km-range distributed strain sensing using slope-assisted PPRM-BOCDR |
| Sub Title (in English) | |
| Keyword(1) | Optical fiber sensors |
| Keyword(2) | Brillouin scattering |
| Keyword(3) | slope assisted BOCDR |
| Keyword(4) | Periodic pseudo-random modulation |
| Keyword(5) | distributed strain sensing |
| Keyword(6) | |
| Keyword(7) | |
| Keyword(8) | |
| 1st Author's Name | Takumi Morikawa |
| 1st Author's Affiliation | Shibaura Institute of Technology (SIT) |
| 2nd Author's Name | Keita Kikuchi |
| 2nd Author's Affiliation | Shibaura Institute of Technology (SIT) |
| 3rd Author's Name | Ryo Inoue |
| 3rd Author's Affiliation | Shibaura Institute of Technology (SIT) |
| 4th Author's Name | Yosuke Mizuno |
| 4th Author's Affiliation | Yokohama National University (YNU) |
| 5th Author's Name | Heeyoung Lee |
| 5th Author's Affiliation | Shibaura Institute of Technology (SIT) |
| Speaker | Author-1 |
| Date Time | 2026-01-22 13:20:00 |
| Presentation Time | 100 minutes |
| Registration for | OFT |
| Paper # | OFT2025-71 |
| Volume (vol) | vol.125 |
| Number (no) | no.324 |
| Page | pp.1-5 |
| #Pages | 5 |
| Date of Issue | 2026-01-15 (OFT) |
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