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7 April 2009 High repetition-rate full-spectrum interrogation of FGB sensors for dynamic measurements in composite laminates
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Abstract
This paper presents a new means for collecting fiber Bragg grating (FBG) data during drop tower measurements used to assess damage to composite structures. The high repetition-rate collection process reveals transient features that cannot be resolved in quasi-static measurements. The experiments made at a repetition rate of about 500 Hz show that the detected FBG spectrum broadens for a short period of time and relaxes quickly to a narrower static state. Furthermore, this relaxation time increases dramatically as the strike count increases. The information gained by such measurements will enhance the ability to characterize and distinguish failure modes and predict remaining lifetime in composite laminate structures.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
W. Kunzler, Z. Zhu, M. Wirthlin, R. Selfridge, S. Schultz, A. Propst, K. Peters, and M. Zikry "High repetition-rate full-spectrum interrogation of FGB sensors for dynamic measurements in composite laminates", Proc. SPIE 7293, Smart Sensor Phenomena, Technology, Networks, and Systems 2009, 729304 (7 April 2009); https://doi.org/10.1117/12.816384
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