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

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

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.

Citation Download Citation

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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