Delamination detection in composites using optical fiber techniques

摘要

Delaminations between composite laminate are of particular interest because they may cause catastrophic failure of the composite structure. The ability to detect the occurrence and location of a delamination is therefore important in predicting and preventing catastrophic failures within composite structures. This paper describes a delamination detection system for a composite panel. The detection is based on the changes in the acoustic properties of the materials before and after delaminations. Extrinsic Fabry-Perot interferometric (EFPI) optical fiber sensors are embedded and attached in/on a composite panel for detection of the acoustic property changes. Experimental results are presented and discussed.