Abstract
Tinplate, being used primarily for packaging purposes, went through a considerable development over the last decades. Its quality was continuously improved enabling significant savings in material consumption and production economy and ecology. A premise for that progress is the development of advanced measurement and inspection equipment. It utilizes different physical principles to allow an online monitoring of important material parameters for regulation feedback or quality control. One of the latest developments is an online inspection system for non-metallic inclusions. It is based on magnetic flux leakage which is contactless detected by arrays of differential GMR sensors. The sensors are mounted to compact sensor modules containing all required peripheral equipment. Multiple sensor modules are connected to hubs which convert their data stream to the GigE camera standard. The resulting device resembles a magnetic line camera covering the whole surface of the inspected strip. The recorded images are processed by a software to detect and classify defects from the material noise.
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