Detection of Vertical Cracks in Carbon Fiber Composites Using an Infrared Line Scanner
Vertical cracks are among the most problematic types of defects from the thermal nondestructive testing (NDT) point of view. Nowadays, the fast thermal inspection techniques most commonly utilize infrared cameras and pulsed heating provided by flash lamps. The flash lamps illuminate the whole surface of a sample, and the resulting heat flow is mostly perpendicular to the surface. Therefore, the heat signature caused by the vertical cracks may be very small, and the cracks may avoid detection.