Method and device for gripping and the appreciation of the optical indications of cracks at the surface of the pieces

摘要

P the invention relates to a method and device for gripping and the evaluation of automatic optical indications of cracks at the surface of parts. / p & & p & the surface is scanned by a photosensitive device by lines whose width corresponds to the maximum width of the optical indication adopted as the threshold of the acquisition, the signals clear - dark are compared by forming the difference between the signal of the line (groups of the central lines) on the one hand, and the signal of the other two lines (groups of rows) of the other hand, and by analyzing this difference in order to trigger a detection signal of errors in the event of overstepping of a minimum threshold. p / p applications: metallurgical industry. / p