Patent ID: 7812281
Filing Date: 2010-10-12
Classification: C03B,G01N,Y10T

Abstract:
1. A method for generating optically perceptible laser-induced cracks in brittle material, comprising the steps of: guiding a laser beam, followed by a coolant jet, relative to the surface of brittle material in order to advance a crack trail into the material starting from an initial crack; making the crack trail visible by applying a marking agent to the surface of the material in the area of the crack trail; and allowing the marking agent to penetrate into the crack and subsequently removing the marking agent from the surface so that only the marking agent that has penetrated into the crack remains, wherein the application of the marking agent is carried out by spraying on the material, and wherein the spraying is carried out during the generation of the crack in that the marking agent is mixed with the coolant.