Aeronautics composite material inspection with a terahertz time-domain spectroscopy system
Idioma
en
Article de revue
Este ítem está publicado en
Optical Engineering. 2014-03, vol. 53, n° 3, p. 031208 (1-14)
SPIE
Resumen en inglés
The usability of pulsed broadband terahertz radiation for the inspection of composite materials from the aeronautics industry is investigated, with the goal of developing a mobile time-domain spectroscopy system that ...Leer más >
The usability of pulsed broadband terahertz radiation for the inspection of composite materials from the aeronautics industry is investigated, with the goal of developing a mobile time-domain spectroscopy system that operates in reflection geometry. A wide range of samples based on glass and carbon fiber reinforced plastics with various types of defects is examined using an imaging system; the results are evaluated both in time and frequency domain. The conductivity of carbon fibers prevents penetration of the respective samples but also allows analysis of coatings from the reflected THz pulses. Glass fiber composites are, in principle, transparent for THz radiation, but commonly with significant absorption for wavelengths >1 THz. Depending on depth, matrix material, and size, defects like foreign material inserts, delaminations, or moisture contamination can be visualized. If a defect is not too deep in the sample, its location can be correctly identified from the delay between partial reflections at the surface and the defect itself.< Leer menos
Palabras clave en inglés
Composite materials
Terahertz imaging
Non-destructive testing
Carbon fiber reinforced plastic
glass fiber reinforced plastic
honeycomb
Rohacell
Laminate
Proyecto europeo
Development and Optimization of THz NDT on Aeronautics Composite Multi-layered Structure
Orígen
Importado de HalCentros de investigación