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Full-Spectral Interrogation of Fiber Bragg Grating Sensors Exposed to Steady-State Vibration

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Abstract

In this paper we measure for the first time the full-spectral response of a fiber Bragg grating (FBG) sensor subjected to vibration. We consider two cases: with and without an initial spectral distortion due to non-uniform strain along the length of the FBG. Previous work has measured only the dynamic response at a single wavelength which is valid when no spectral distortion is present. FBG sensors are mounted near the notch tip on a double edge notch specimen that is also subjected to harmonic vibration. We measure the full-spectral response of the FBG at 100 kHz applying an interrogator recently developed by the authors. The measurements of the FBG response with an initial spectral distortion clearly show the transient response and are verified through simulation. Finally, we demonstrate that the use of the high-speed, full-spectral interrogator permits the separation of the spectral distortion and the harmonic vibration from the FBG response signal through classical filtering and can therefore be applied to measure non-uniform strain fields in noisy environments.

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Acknowledgements

The authors would like to thank the National Science Foundation for their support of this research through grant CMMI 0900369.

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Authors and Affiliations

  1. Department of Mechanical and Aerospace Engineering, North Carolina State University, Campus Box 7910, Raleigh, NC, 27695, USA

    S. Webb, K. Peters & M. A. Zikry

  2. Department of Electrical and Computer Engineering, Brigham Young University, 459 Clyde Building, Provo, UT, 84602, USA

    S. Chadderdon, S. Nikola, R. Selfridge & S. Schultz

Authors
  1. S. Webb
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  2. K. Peters
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  3. M. A. Zikry
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  4. S. Chadderdon
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  5. S. Nikola
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  6. R. Selfridge
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  7. S. Schultz
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Correspondence to K. Peters.

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Webb, S., Peters, K., Zikry, M.A. et al. Full-Spectral Interrogation of Fiber Bragg Grating Sensors Exposed to Steady-State Vibration. Exp Mech 53, 513–530 (2013). https://doi.org/10.1007/s11340-012-9661-x

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  • DOI: https://doi.org/10.1007/s11340-012-9661-x

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