Photothermics – key technology for coating thickness measurement

The PaintChecker coating thickness meters use the photothermal measuring process to determine the thickness of coatings on a wide variety of substrates. This contactless, non-destructive method is ideal for measuring paints, powder coatings and glazes on metallic and non-metallic substrates.

As with other non-destructive coating thickness measurement methods, e.g. ultrasonic, eddy current or induction, photothermal coating thickness is not measured directly, but calculated from measurement signals. It is therefore important to consider the individual thermal properties of the coating material and the substrate.

Reproducible measurement results even with the most demanding coatings

Thick, heavy coatings need more energy to heat up and cool down more slowly than thin, light coatings. During the measuring process, it is therefore important, as in photography, that the strength of the light source and the measuring time are optimally adjusted to the respective situation, in order to obtain accurate and reproducible measurement results.

In the case of powder coatings and paintwork, there is also the fact that the user often does not want to know the thickness of the powder or wet film that has just been applied, but the later, final thickness after baking or drying. To do this, the device must take into account the expected shrinkage of the coating material during curing.

System calibrations tailored to your application

All these parameters are already stored in the device by OptiSense in the form of system calibrations. The scope of delivery includes calibrations for standard situations that cover a large range of typical applications. In addition, each customer receives a system calibration that is specially tailored to his application, created by OptiSense on the basis of the coating samples provided. Additional system calibrations can be obtained from OptiSense as part of our calibration services and can be stored permanently in the device.

Calibration made easy

Find out how you can calibrate your PaintChecker mobile by yourself, in this three-minute, step-by-step video.

By courtesy of UPA Technology