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Paper Abstract and Keywords
Presentation 2007-08-24 13:00
Practical method for measuring distributed strain and temperature with very high measurand resolution based on Rayleigh backscatter traces at multiple laser frequencies
Yahei Koyamada, Mutsumi Imahama, Kazuo Hogari (Ibaraki Univ.) OFT2007-29
Abstract (in Japanese) (See Japanese page) 
(in English) We have proposed previously a technique for measuring distributed strain and temperature with a very high measurand resolution. This technique makes use of the jagged appearance of Rayleigh backscatter traces from a single-mode fiber measured using a coherent optical time-domain reflectometer (OTDR) with a precisely frequency-controlled light source. However, the restorability of the Rayleigh backscatter traces that is essential for our measurement technique has not been confirmed experimentally as yet and the measurement procedure has still to be studied. In this paper, we present experimental results that confirm, for the first time, the restorability of the Rayleigh backscatter traces. In addition, we describe a practical method to derive the strain or temperature distribution from Rayleigh backscatter traces measured at multiple laser frequencies. Our numerical simulation, which includes an estimation of the signal-to-noise ratio of the OTDR, shows that the technique enables us to measure distributed strain / temperature with a resolution better than 1 strain / 0.1 and a spatial resolution of 10 cm over a 20-km long fiber.
Keyword (in Japanese) (See Japanese page) 
(in English) Fiber sensor / Rayleigh scattering / distributed sensor / strain sensor / temperature sensor / OTDR / /  
Reference Info. IEICE Tech. Rep., vol. 107, no. 191, OFT2007-29, pp. 83-88, Aug. 2007.
Paper # OFT2007-29 
Date of Issue 2007-08-16 (OFT) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
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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)
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Conference Information
Committee OFT OCS  
Conference Date 2007-08-23 - 2007-08-24 
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 2007-08-OFT-OCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Practical method for measuring distributed strain and temperature with very high measurand resolution based on Rayleigh backscatter traces at multiple laser frequencies 
Sub Title (in English)  
Keyword(1) Fiber sensor  
Keyword(2) Rayleigh scattering  
Keyword(3) distributed sensor  
Keyword(4) strain sensor  
Keyword(5) temperature sensor  
Keyword(6) OTDR  
Keyword(7)  
Keyword(8)  
1st Author's Name Yahei Koyamada  
1st Author's Affiliation Ibaraki University (Ibaraki Univ.)
2nd Author's Name Mutsumi Imahama  
2nd Author's Affiliation Ibaraki University (Ibaraki Univ.)
3rd Author's Name Kazuo Hogari  
3rd Author's Affiliation Ibaraki University (Ibaraki Univ.)
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Speaker Author-2 
Date Time 2007-08-24 13:00:00 
Presentation Time 25 minutes 
Registration for OFT 
Paper # OFT2007-29 
Volume (vol) vol.107 
Number (no) no.191 
Page pp.83-88 
#Pages 6 
Date of Issue 2007-08-16 (OFT) 

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