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A Hybrid Fiber-Optic Sensor System for Multi-Stress Condition Monitoring of Wind Turbines

하이브리드 광섬유 센서 시스템을 이용한 풍력발전기의 다중물리량 상태감시

Kim, Dae-Gil;Kim, Hyunjin;Song, Minho
김대길;김현진;송민호

  • Received : 2015.06.22
  • Accepted : 2015.07.07
  • Published : 2015.08.31

Abstract

A hybrid fiber-optic sensor system which combines fiber Bragg grating sensors and a Michelson interferometer has been constructed and evaluated for condition monitoring of large scale wind turbines. In order to measure multiple stresses applied to wind turbines such as strain, temperature and vibration, the system uses single broadband light source. It addresses both types of sensors, which simplifies the optical setup and enhances the cost-effectiveness of condition monitoring system. An athermal-packaged FBG is used to supply quasi-coherent light, of which coherence length is about 3.28mm, for the Michelson interferometer demodulation. Experimental results demonstrated that the proposed fiber-optic sensor system was capable of measuring strain and temperature with measurement accuracy of 1pm. Also 500~2000Hz vibration signals were successfully analyzed by applying FFT signal processing to interference signals.

Keywords

Fiber-optic Sensor;FBG;Michelson Interferometer;Wind Turbine;Condition Monitoring

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Acknowledgement

Supported by : 한국연구재단