Multi-spectral near infrared NDE of polymer composites. (March 2019)

• Record Type: Journal Article
• Authors: Senni, L.; Laureti, S.; Rizwan, M.K.; Burrascano, P.; Hutchins, D.A.; Davis, L.A.J.; Ricci, M.
• Is Part Of: NDT & E international. Volume 102(2019)
• Page Start: 281
• Page End: 286
• Publication Date: 2019-03
• Subjects: Non-destructive evaluation -- NIR -- Multispectral imaging -- Composites -- Solar panels; Nondestructive testing -- Periodicals; Contrôle non destructif -- Périodiques; Electronic journals; 620.1127
• DOI: 10.1016/j.ndteint.2018.12.012
• Languages: English
• ISSNs: 0963-8695

Abstract

Abstract: Near infrared signals have been used to generate images of the internal structure of fibre-reinforced polymer and foam-filled honeycomb samples. Several different measurement configurations have been investigated, including the use of both modulated light-emitting diodes at discrete wavelengths and broad bandwidth illumination for spectroscopic measurements. It is shown that transmission through the samples is wavelength-dependent, and that artificial defects can be detected within polymer composite materials. In addition, wavelength-dependent properties have been used to detect changes due to water ingress into both composite materials and a solar panel structure as a non-contact NDE technique. Highlights: Near infrared imaging of composites and foam filled honeycomb. Wavelength-dependent properties of the materials are studied. The system is able to detect delamination and water in polymer composites. A multi-frequency Lock-In recovery signal technique is successfully used. The wavelength properties are used to detect water in solar panels structure.