Near-infrared optical coherence tomography for the inspection of fiber composites

Conference paper (2015)
Department
Aerospace Structures and Materials (Aerospace Engineering) (TU Delft)
Copyright: CC-BY-ND
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Published Date

31-12-2015

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Source:

Proceedings of the 7th International Symposium on NDT in Aerospace, Bremen, Germany, November 16-18,2015

Faculty

Aerospace Engineering

Department

Aerospace Structures and Materials

Abstract

Optical coherence tomography (OCT) is a non-invasive imaging method, which allows the econstruction of three dimensional depth-resolved images with microscale resolution. Originally developed for biomedical diagnostics, nowadays it also shows a high potential for applications in the field of non-destructive testing (NDT). This work demonstrates how OCT could help to investigate the delamination growth in fiber composites. A customized OCT system was built with a near-infrared light source with center wavelength at 1550 nm. It was used as an inline NDT tool to monitor the crack tips and image the crack surfaces within a glass fiber composite under static loading. For carbon fiber composites, although it is difficult to acquire the internal structures due to their opaque property, OCT can still work as a surface profilometer to reconstruct 3D crack surface profiles, providing substantial information for the study of crack growth in the composites.

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