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

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

Author Affiliations +

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.

Citation Download Citation

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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