Contact-free, robot-assisted coating thickness measurement in the industrial environment

Speaker:
Jonuscheit, Joachim; Fraunhofer ITWM; Germany

Authors:
Jonuscheit, J.; Fraunhofer Institute for Industrial Mathematics ITWM; Germany
Klier, J.; Fraunhofer Institute for Industrial Mathematics ITWM; Germany
Molter, D.; Fraunhofer Institute for Industrial Mathematics ITWM; Germany
Weber, S.; Fraunhofer Institute for Industrial Mathematics ITWM; Germany
von Freymann, G.; Fraunhofer Institute for Industrial Mathematics ITWM; Germany

ID: ECNDT-0044-2018
Session: Microwave, Terahertz, and Infrared NDE
Room: H1
Date: 2018-06-13
Time: 16:40 - 17:00

Many materials are coated specifically for protection or finishing, although the coatings will apply to an increasing degree as a multi-layer system. Such coatings require a control with regard to material usage and functionality during or after the coating-process. For this purpose, a testing system is needed, which can determine the individual layer thicknesses inside of a multi-layer system non-destructively, contact-free and without risk to the user. Numerous laboratory studies have proved that the Terahertz technology is a suitable technology, for the measurement of multi-layer systems in a technically interesting thickness range of 10 to 200 µm.
However, additional requirements must be complied for the application in the industrial environment. For the integration in the production process it has to be demonstrated, that the sensor can be mounted on a robot. Furthermore, there are always position tolerances in a continuous production process, so that the sample to be measured is not always located in the same position. Additionally, there are always vibrations in a production hall due to the variety of machines, which disturb the measurement process. That is reason why a testing system has to deal with these disturbances. For this purpose, the terahertz testing system has been equipped with additional sensors. In a number of field tests in manufacturing plants of the automotive industry the feasibility has been successfully demonstrated.
The following presentation gives an overview of the testing system and the use of the additional sensors, as well as the results of the field tests.