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Online Strain Measurement at Multiple Points on a Rotating Blade with Fiber Bragg Grating Sensors and a Rotary Optical Coupler

광섬유 격자 센서와 회전 광학 커플러를 사용한 회전하는 블레이드 여러 지점에서의 온라인 변형률 측정

  • 이종민 (한국과학기술연구원(지능시시템연구본부)) ;
  • 황요하 (한국과학기술연구원 지능시시템연구본부)
  • Published : 2008.01.01

Abstract

Strain-gauges have been dominantly used to measure strain at various points on a rotor, however, either a slip ring or telemetry has to be used to send sensor signals to data acquisition instruments at stationary side. Both slip ring and telemetry have numerous inherent problems which force severe limitations in real applications. This paper introduces a new rotor condition monitoring system using FBG(Fiber Bragg Grating) sensors and a rotary optical coupler. A single optical fiber with many FBG sensors is installed on the rotor and an optical dynamic interrogator is installed at stationary side. The sensor signal connection between rotating part and stationary part is made by the rotary optical coupling method which makes use of light's unique characteristic-light travels through space. Broad band light source from the interrogator travels to the optical fiber on the rotor and reflected FBG sensor signals travel back to the optical fiber on stationary side and are connected to the interrogator. Rotary optical coupler's insertion loss change due to rotation is compensated by using a reference sensor installed at the center of the rotor. The proposed system's performance has been successfully demonstrated by accurately measuring strains at 5 points on a blade rotating at high speed.

Keywords

Rotary Optical Coupler;Fiber Bragg Grating Sensor;Rotating Blade;Rotation Compensation;Rotor

References

  1. Carlos E. S. Cesnik, SangJoon Shin and Matthew L. Wlbur, 2001, 'Dynamic Response of Active Twist Rotor Blades,' Smart Materials and Structures, Vol. 10, pp. 62-76 https://doi.org/10.1088/0964-1726/10/1/306
  2. Yoonsu Nam, Mooyeol Park and Neungsoo Yoo, 2006, 'A Calibration and Uncertainty Analysis on the Load Monitoring System for a Low Speed Shaft and Rotor Blade of a Wind Turbine,' Transactions of KSME, A, Vol. 30, No. 5, pp. 560-567 https://doi.org/10.3795/KSME-A.2006.30.5.560
  3. Cornelia Schmidt-Hattenberger, Marcel Naumann and Gunter Borm, 2003, 'Fiber Bragg Grating Strain Measurements in Comparison With Additional Techniques for Rock Mechanical Testing,' IEEE Sensors Journal, Vol. 3, No. 1, pp. 50-55 https://doi.org/10.1109/JSEN.2003.809025
  4. Gebremichael, Y.M., Li, W., Meggitt, B.T., Boyle, W.J.O., Grattan, K.T.V., McKinley, B., Boswell, L.F., Aarnes, K.A., Aasen, S.E., Tynes, B., Fonjallaz, Y. and Triantafillou, T., 2005, 'A Field Deployable, Multiplexed Bragg Grating Sensor System Used in an Extensiv Highway Bridge Monitoring Evaluation Tests,' IEEE Sensors Journal, Vol. 5, No. 3, pp. 510-519 https://doi.org/10.1109/JSEN.2005.846185
  5. Clenn F. Dorsey, 1982, 'Fiber Optic Rotary Joints - A Review,' IEEE Transactions on Components, Hybrids, and Manufacturing Technology, Vol. CHMT-5, No. 1, pp.37-41 https://doi.org/10.1109/TCHMT.1982.1135951
  6. Xiaochun Li and Fritz Prinz, 2004, 'Analytical and Experimental Study on Noncontact Sensing with Embedded Fiber-optic Sensors in Rotating Parts,' Journal of Lightwave Technology, Vol. 22, No. 7, pp. 1720-1727 https://doi.org/10.1109/JLT.2004.829231
  7. Ludi Krunger, Pieter L. Swart, Anatoli A. Chtcherbakov and A. J. van Wyk, 2004, 'Non-contact Torsion Sensor using Fibre Bragg Gratings,' Measurement Science and Technology, Vol. 15, pp. 1448-1452 https://doi.org/10.1088/0957-0233/15/8/002
  8. Injae Lee, Jong Min Lee, Sangbea Lee and Yoha Hwang, 2006, 'On-line Strain Measurement of Rotating Blade Using Fiber Bragg Grating Sensors and Beam Coupler,' Transactions of KSNVE, Vol. 16, No. 11, pp. 1172-1178 https://doi.org/10.5050/KSNVN.2006.16.11.1172
  9. Jose Miguel Lopez-Higuera, 1998, OPTICAL SENSORS, Servicio de Publicaciones de la Universidad de Cantabria, Cantabria in Spain, pp. 97-110
  10. Wencai Jing, Dagong Jia, Feng Tang, Hongxia Zhang, Ge Zhou, Jinglong Yu, Fanmin Kong and Kun Liu, 2004, 'Design and Implementation of a Broadband Optical Rotary Joint Using C-lenses,' Optics Express, Vol. 12, No. 17, pp. 4088-4093 https://doi.org/10.1364/OPEX.12.004088
  11. Harun, S. W., Tamchek, N., Poopalan, P. and Ahmad, H., 2003, 'Effect of Injection of C-band ASE on L-band Erbium-Doped Fiber Amplifier,' JETP Letters, Vol. 77, No. 9, pp. 461-463 https://doi.org/10.1134/1.1591969
  12. Daniel C. Betz, Graham Tursby, Brian Culshaw and Weislaw J. Staszewski, 2006, 'Advanced Layout of a Fiber Bragg Grating Strain Gauge Rosette,' Journal of Lightwave Technology, Vol. 24, No. 2, pp. 1019-1026 https://doi.org/10.1109/JLT.2005.862442

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