| Presentation | 2020-11-13 Commercialization of real-time distributed acoustic fiber optic sensing (DAS) utilizing chirped pulse Kinzo Kishida, Artur Guzik, Li Ttken, Nishiguchi Kenichi, Daiji Azuma, Qingwen Liu, Zuyuan He, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(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) |
| Keyword(in English) | Real time phase DAS / high SNR / Low noise floor / post spatial resolving / non-stop event monitoring |
| Paper # | OFT2020-44 |
| Date of Issue | 2020-11-05 (OFT) |
| Conference Information | |
| Committee | OFT / ITE-BCT / OCS / IEE-CMN |
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| Conference Date | 2020/11/12(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Online |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Chair | Yuji Matsuura(Tohoku Univ.) / / Joji Maeda(Tokyo Univ. of Science) / Shun Morimura(CRIEPI) |
| Vice Chair | / / / Kouji Hirata(Kansai Univ) |
| Secretary | (NTT) / (Sumitomo Electric) / / Kouji Hirata(NTT) |
| Assistant | Hajime Arao(Sumitomo Electric) / Yukihiro Goto(NTT) / / / Yuuichi Shinohara(TEPCO Power Grid) / Akihiro Tanaka(CRIEPI) |
| Paper Information | |
| Registration To | Technical Committee on Optical Fiber Technology / Technical Group on Broadcasting Technology / Technical Committee on Optical Communication Systems / Technical Meeting on Communications |
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| Language | JPN |
| 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) |
| Date | 2020-11-13 |
| Paper # | OFT2020-44 |
| Volume (vol) | vol.120 |
| Number (no) | OFT-230 |
| Page | pp.pp.39-44(OFT), |
| #Pages | 6 |
| Date of Issue | 2020-11-05 (OFT) |