State-of-the-Art Survey for Automatic Optical Detection of Surface Defects on Ordnance Material.

摘要

This state-of-the-art survey is aimed towards optical procedures that might prove useful in detecting defects (such as cracks, blemishes, pits, and missing or out-of-tolerance components) typically found in ordnance items. Included in this report are sections on color, diffraction, reticles, scatter, optical spatial filters, mechanical and electronic optical scanning systems, and analog-digital electronic information analysis. It is found in general that the ability to resolve a defect has an inverse relationship to the complexity of the background. If the background is sufficiently subdued, a simple photodetector circuit will serve. It is concluded that the design engineer must carefully evaluate the specific problem in order to obtain the simplest, most cost effective defect detection system that meets quality control criteria.