Distributed dynamic strain measurement using long-gauge FBG and DTR3 interrogator based on delayed transmission/reflection ratiometric reflectometry

M. Nishiyama; H. Igawa; T. Kasai; N. Watanabe

doi:10.1117/12.2030872

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15 October 2013 Distributed dynamic strain measurement using long-gauge FBG and DTR³ interrogator based on delayed transmission/reflection ratiometric reflectometry

M. Nishiyama, H. Igawa, T. Kasai, N. Watanabe

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Proceedings Volume 8924, Fourth Asia Pacific Optical Sensors Conference; 892412 (2013) https://doi.org/10.1117/12.2030872
Event: Asia Pacific Optical Sensors Conference 2013, 2013, Wuhan, China

Abstract

In this paper, we reveal characteristics of static and dynamic distributed strain measurement using a long-gauge fiber Bragg grating (FBG) and a Delayed Transmission/Reflection Ratiometric Reflectometry (DTR³) scheme. The DTR³ scheme has capability of detecting distributed strain using the long-gauge FBG with 50-cm spatial resolution. Additionally, dynamic strain measurement can be achieved using this technique in 100-Hz sampling rate. We evaluated strain sensing characteristics of the long-gauge FBG attached on 2.5-m aluminum bar by a four-point bending equipment. Experimental results showed that the DTR³ using the long-gauge FBG could detect distributed strain in static tests and resonance frequency of structure in free vibration tests. As a result, it is suggested that the DTR³ scheme using the longgauge FBG is attractive to structural health monitoring (SHM) as dynamic deformation detection of a few and tensmeters structure such as the airplane wing and the helicopter blade.

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M. Nishiyama, H. Igawa, T. Kasai, and N. Watanabe "Distributed dynamic strain measurement using long-gauge FBG and DTR³ interrogator based on delayed transmission/reflection ratiometric reflectometry", Proc. SPIE 8924, Fourth Asia Pacific Optical Sensors Conference, 892412 (15 October 2013); https://doi.org/10.1117/12.2030872

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