Long-gauge FBGs interrogated by DTR3 for dynamic distributed strain measurement of helicopter blade model

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

doi:10.1117/12.2059452

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2 June 2014 Long-gauge FBGs interrogated by DTR3 for dynamic distributed strain measurement of helicopter blade model

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

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Proceedings Volume 9157, 23rd International Conference on Optical Fibre Sensors; 91579E (2014) https://doi.org/10.1117/12.2059452
Event: OFS2014 23rd International Conference on Optical Fiber Sensors, 2014, Santander, Spain

Abstract

In this paper, we describe characteristics of distributed strain sensing based on a Delayed Transmission/Reflection Ratiometric Reflectometry (DTR3) scheme with a long-gauge Fiber Bragg Grating (FBG), which is attractive to dynamic structural deformation monitoring such as a helicopter blade and an airplane wing. The DTR³ interrogator using the longgauge FBG has capability of detecting distributed strain with 50 cm spatial resolution in 100 Hz sampling rate. We evaluated distributed strain sensing characteristics of the long-gauge FBG attached on a 5.5 m helicopter blade model in static tests and free vibration dynamic tests.

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M. Nishiyama, H. Igawa, T. Kasai, and N. Watanabe "Long-gauge FBGs interrogated by DTR3 for dynamic distributed strain measurement of helicopter blade model ", Proc. SPIE 9157, 23rd International Conference on Optical Fibre Sensors, 91579E (2 June 2014); https://doi.org/10.1117/12.2059452

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