Abstract
Impacts create internal damage in foam core sandwich structures and this internal damage can cause severe reduction in strength. Therefore, the aim of this study is the impact identification of foam core sandwich panels by using embedded fiber Bragg grating (FBG) sensors. FBG sensors were embedded between the skin-core interface and strain response during impact was used to identify the impact location. Strain measurement system consists of a light source, FBG sensors, arrayed waveguide grating (AWG) and photo detectors. The accuracy of the system was demonstrated by indentation test using form core sandwich panels with FBG sensors. From the result, this system was able to measure strain accurately. And then we investigated the relation between strain and distance from sensors to the indentation point.
