Method and system for surface inspection of a cured composite part comprising glass fibers and carbon fibers, in particular of an aircraft

A method for surface inspection of a cured composite part comprising glass fibers and carbon fibers, the method comprising the steps:

• illuminating a surface of a composite part to be inspected with infrared light emitted from an IR light source;
• capturing an image of the surface with a camera, wherein IR light source is arranged so that the infrared light hits the surface at a first angle α provide a dark field illumination of the surface, and wherein the camera is arranged so that the camera points at the surface at a second angle β to capture the image of the dark field illuminated surface;
• and
• detecting one or more glass fiber layers on top of one or more carbon fiber layers within the composite part by evaluating the image with regard to brightness and contrast.