Lasergestützte Stoffanalyse für die on-line Prüfung von Oberflächenschichten

A variety of different laser-based measuring techniques were developed for material analysis. Among these induced breakdown spectroscopy is a method, which is specially suited for on-line inspection tasks as e.g. the identification of products with variable composition of the determination of element composition of surface layers. It is a non-tactile, high speed technique, which does not require vacuum conditions. Measurements at different locations of a surface can be performed within a very short time. A combination of laser induced breakdown spectroscopy and laser drilling enables the measurement of depth profiles of element concentrations. First results of laser analysis of surface layers on steel concerning surface and depth concentration profiles are presented. The high-speed features of the laser induced breakdown spectroscopy are demonstrated by an identification system, which sorts a mixture of zinc- coated and uncoated steel plates.