Dynamic interferometric imaging of the thickness distribution of evaporating thin liquid films
- 35 Downloads
In functional printing, film homogeneity is a key criterion, but there are several phenomena leading to inhomogeneities. We shall focus on the solvent evaporation process of gravure-printed thin films. The best aspects of different published approaches are combined to create a new algorithm for optically determining the film thickness development. In this way, small structures as well as the overall thickness of large-area thin films can be tracked while drying. It becomes clear that the biggest challenge is balancing the camera resolution and frame rate to receive plausible and accurate results.
KeywordsThin film interference Gravure printing Functional printing Drying films Thickness map Thickness evolution
We kindly acknowledge the financial support by the Federal Ministry of Education and Research of the Federal Republic of Germany under grant No. 13N13692 and the German Research Foundation (DFG) within the Collaborative Research Centre 1194 “Interaction between Transport and Wetting Processes,” Project C01.
Conflict of interest
The authors declare that there are no conflicts of interest related to this article.
- 2.Griesheimer, S, Dörsam, E, Roisman, I, Bein, T, Farbspaltungsphänomene von Druckfarben an strukturierten Oberflächen am Beispiel des Flexodrucks, Universitäts- und Landesbibliothek Darmstadt, 2014Google Scholar
- 8.Parthasarathy, S, Wolf, D, Hu, E, Hackwood, S, Beni, G, “A Color Vision System for Film Thickness Determination,” in Proc. 1987 IEEE International Conference on Robotics and Automation (Institute of Electrical and Electronics Engineers, 1987), pp. 515–519.Google Scholar
- 11.Optik für Ingenieure, Grundlagen, 2nd ed. Springer, Berlin Heidelberg (2002)Google Scholar
- 12.Coffin, D, “Dave Coffin’s Home Page,” https://www.cybercom.net/~dcoffin/.