OptiSense Coating Thickness Measurement
Contactless, fast and efficient: The photothermal coating thickness measurement is a contactless measurement method for paints, powder coatings and glazes on metallic and non-metallic substrates. The different thermal properties of the coating and the substrate are used to determine the coating thickness.
The surface of the coating is warmed up by a few degrees with a short, intense light pulse and then cools down again by dissipating the heat into deeper areas. The thinner the coating, the faster the temperature drops. The temperature curve over time is recorded with a highly sensitive infrared sensor and converted into the coating thickness.
The light pulse can be generated in various ways. Compared to xenon flash lamps, LEDs and diode lasers offer all the advantages of semiconductor technology such as long service life, high efficiency and absolute shock resistance.
Thanks to the precise measuring spot, the method is also suitable for the smallest components. The coating thickness can even be determined on bending edges, corners and curved surfaces, where conventional measurement technology reaches its limits. Disturbances caused by rough surfaces or material grains are compensated for by optical averaging, so that even pastes and powders can be checked before baking.
The measurement is carried out without contact from a distance of several centimetres. This means that wet and sticky coatings can be measured just as easily as soft and sensitive surfaces. A contamination of the part or the carry-over of coating material is thus excluded in principle.
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