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Proceedings Paper

High dynamic range high sensitivity FBG interrogation
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Paper Abstract

We present a fiber Bragg grating (FBG) interrogation method using a micro-controller board and optical filter that achieves high strain sensitivity and high dynamic range. This interrogation method allows high sensitivity detection of ultrasonic waves superimposed on low-frequency (on the order of 100Hz) vibrations of arbitrary magnitude. One possible application is in-situ structural health monitoring of windmill blades exposed to strong winds by using FBG sensors for detection of ultrasonic waves. Interrogator operation is based on the edge filtering method using a broadband source, fiber Fabry-Perot filter and a micro-controller board which acts as a control feedback loop that locks the filter wavelength to the mid-reflection point on the FBG spectrum. Wavelength locking method allows high sensitivity for edge filtering of high-frequency waves, while the feedback signal is the measurement of low-frequency vibration with high dynamic range. The concept of the interrogator operation and different implementations are described and discussed with experimental results.

Paper Details

Date Published: 11 April 2013
PDF: 6 pages
Proc. SPIE 8694, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2013, 86940N (11 April 2013); doi: 10.1117/12.2009875
Show Author Affiliations
Nikola Stan, Brigham Young Univ. (United States)
Douglas Bailey, Brigham Young Univ. (United States)
Spencer Chadderdon, Brigham Young Univ. (United States)
Richard Selfridge, Brigham Young Univ. (United States)
Stephen M. Schultz, Brigham Young Univ. (United States)
Sean Webb, North Carolina State Univ. (United States)
Kara J. Peters, North Carolina State Univ. (United States)
Mohammed Zikry, North Carolina State Univ. (United States)


Published in SPIE Proceedings Vol. 8694:
Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2013
Tzu Yang Yu, Editor(s)

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