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Proceedings Paper

Optical-fiber-based adhesive bondline monitoring system for composite patch systems
Author(s): Jennifer L. Elster; Angela Trego; James F. Dante; Mark E. Jones; Jason Avram
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Paper Abstract

A primary concern with composite repair patches is the potential degradation of load transfer capabilities due to aging and environmental effects. The development of low profile, distributed, embeddable, real-time, optical fiber sensors capable of detecting the onset of patch delamination on repaired regions of the aircraft would eliminate a significant portion of the related maintenance costs as well as improve confidence levels in the technology. The presented sensing system is comprised of optical fiber long period gratings (LPGs) for chemical measurement and Bragg gratings for strain measurement. The sensors can be multiplexed together to monitor the structural health of the patch system and status of any remaining damage in the parent structure. The LPG sensors operate based on specially designed sensing coatings which cause a measurable change in the refractive index 'seen' by the LPG in the presence of target molecules. In this configuration, LPGs can be used to detect moisture infiltration and other chemical changes within a localized environment. Complementary to the long period grating, Bragg grating strain sensors can be fabricated on the same optical fiber to measure load transfer and composite delamination in patches used to repair cracks that occur in aging aircraft.

Paper Details

Date Published: 24 July 2001
PDF: 8 pages
Proc. SPIE 4335, Advanced Nondestructive Evaluation for Structural and Biological Health Monitoring, (24 July 2001); doi: 10.1117/12.434173
Show Author Affiliations
Jennifer L. Elster, Luna Innovations, Inc. (United States)
Angela Trego, Boeing Phantom Works (United States)
James F. Dante, Univ. of Dayton Research Institute (United States)
Mark E. Jones, Luna Innovations, Inc. (United States)
Jason Avram, U.S. Air Force Materials Directorate (United States)

Published in SPIE Proceedings Vol. 4335:
Advanced Nondestructive Evaluation for Structural and Biological Health Monitoring
Tribikram Kundu, Editor(s)

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