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Journal of the Korean Institute of Illuminating and Electrical Installation Engineers

ISO Journal TitleJ Korean Inst. IIIum. Electr. Install. Eng.
Title FBG sensor system for condition monitoring of wind turbine blades
Authors Dae-Gil Kim ; Hyun-Jin Kim ; Min-Ho Song
DOI http://dx.doi.org/10.5207/JIEIE.2013.27.8.075
Page pp.75-82
ISSN 1225-1135
Keywords Fiber Bragg Grating ; Condition Monitoring System ; Wind Turbine Blade ; Wavelength-Swept Fiber Laser ; Spectrometer
Abstract We propose a fiber grating sensor system for condition monitoring of large scale wind turbine blades. For the feasibility test of the proposed sensor system, a down-scaled wind turbine has been constructed and experimented. Fiber grating sensors were attached on a blade surface for distributed strain and temperature measurements. An optical rotary joint was used to transmit optical signals between the FBG sensor array and the signal processing unit. Instead of broadband light source, we used a wavelength-swept fiber laser to obtain high output power density. A spectrometer demodulation is used to alleviate the nonlinear wavelength tuning problem of the laser source. With the proposed sensor system we could measure dynamic strain and temperature profiles at multi-positions of rotating wind turbine blades.