The measurement of the thickness of a layer (foils, varnish, and paint) by several stacked layers is an unsolved problem in the industry. A test by the processing of the foil in packaging is necessary to guarantee the shelf life of the packaged item. Changes in the thickness of a layer, glue failure, cold bonding, breakages in the seal, leakage in vacuum packaging and such are safely, rapidly, none destructively and very dependably determined with modern technology. With PTR technology, arsenco ag has developed a new process technique which is used to solve the above described tasks. If an energy pulse is forced upon a surface and at the same time detects the conduct of the energy timely and spectral with high dynamics, then all necessary signals for the measurement of the layer thickness are present. The analysis of the data is carried out with a standard computer.
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