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Proceedings Paper

Impact damage monitoring in CFRP using fiber Bragg grating ultrasound sensors
Author(s): Hiroshi Tsuda; Jung-Ryul Lee; Shunji Eguchi
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Paper Abstract

Impact damage in CFRP was monitored by ultrasonic inspection method using small-diameter fiber Bragg grating (FBG) sensors. The FBG ultrasound detection system consisted of broadband light source, FBG sensor and tunable optical filter. Broadband light was launched into the FBG sensor. Light reflected from the FBG sensor was transmitted through the tunable optical filter whose transmissive wavelength range is comparable to the reflected wavelength range of the FBG sensor. The operating wavelength of tunable filter was set to optimize the sensitivity of ultrasound detection. Ultrasound vibration was converted into change in intensity of light transmitted through the filter. A cross-ply carbon fiber-reinforced plastic (CFRP) plate was used as a test specimen for impact damage monitoring. A 6.3 X 9mm2 impact damage was introduced by ball dropping. Both FBG ultrasound sensor and piezoelectric ultrasound transmitter were attached on the CFRP surface. The change in responses to ultrasound excited by either spike signal or toneburst signal before and after impact damage was investigated. In response to ultrasound excited by spike signal, the response after impact damage showed a scattered behavior where the period of response signal got longer. In response to ultrasound excited by toneburst signal, damage signal features scattered and distorted waveform. Experimental results proved that the FBG inspection system could monitor a 6.3 X 9mm2 impact damage in CFRP.

Paper Details

Date Published: 20 March 2006
PDF: 8 pages
Proc. SPIE 6176, Nondestructive Evaluation and Health Monitoring of Aerospace Materials, Composites, and Civil Infrastructure V, 617607 (20 March 2006); doi: 10.1117/12.655960
Show Author Affiliations
Hiroshi Tsuda, National Institute of Advanced Industrial Science and Technology (Japan)
Jung-Ryul Lee, National Institute of Advanced Industrial Science and Technology (Japan)
Shunji Eguchi, Tokyo Univ. of Science (Japan)


Published in SPIE Proceedings Vol. 6176:
Nondestructive Evaluation and Health Monitoring of Aerospace Materials, Composites, and Civil Infrastructure V
Aftab A. Mufti; Andrew L. Gyekenyesi; Peter J. Shull, Editor(s)

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