Dynamic interferometric imaging of the thickness distribution of evaporating thin liquid films

  • Jacqueline StammEmail author
  • Dominik Daume
  • Tobias Hartwig
  • Maximilian Oschmann
  • Julian Schäfer
  • Hans Martin Sauer
  • Edgar Dörsam


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.


Thin 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.


  1. 1.
    Raupp, S, Daume, D, Tekoglu, S, Merklein, L, Lemmer, U, Hernandez-Sosa, G, Sauer, HM, Dörsam, E, Scharfer, P, Schabel, W, “Slot Die Coated and Flexo Printed Highly Efficient SMOLEDs.” Adv. Mater. Technol., 2 1600230 (2017)CrossRefGoogle Scholar
  2. 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
  3. 3.
    de Gans, B-J, Duineveld, PC, Schubert, US, “Inkjet Printing of Polymers. State of the Art and Future Developments.” Adv. Mater., 16 203–213 (2004)CrossRefGoogle Scholar
  4. 4.
    Hernandez-Sosa, G, Bornemann, N, Ringle, I, Agari, M, Dörsam, E, Mechau, N, Lemmer, U, “Rheological and Drying Considerations for Uniformly Gravure-Printed Layers. Towards Large-Area Flexible Organic Light-Emitting Diodes.” Adv. Funct. Mater., 23 3164–3171 (2013)CrossRefGoogle Scholar
  5. 5.
    Toolan, DTW, “Straightforward Technique for In Situ Imaging of Spin-Coated Thin Films.” Opt. Eng, 54 24109 (2015)CrossRefGoogle Scholar
  6. 6.
    Bornemann, N, Dörsam, E, “A Flatbed Scanner for Large-Area Thickness Determination of Ultra-Thin Layers in Printed Electronics.” Optics Express, 21 21897–21911 (2013)CrossRefGoogle Scholar
  7. 7.
    Birnie, DP, “Optical Video Interpretation of Interference Colors from Thin Transparent Films on Silicon.” Mater. Lett., 58 2795–2800 (2004)CrossRefGoogle Scholar
  8. 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
  9. 9.
    Kitagawa, K, “Thin-Film Thickness Profile Measurement by Three-Wavelength Interference Color Analysis.” Appl. Opt., 52 1998–2007 (2013)CrossRefGoogle Scholar
  10. 10.
    Ebbens, S, Hodgkinson, R, Parnell, AJ, Dunbar, A, Martin, SJ, Topham, PD, Clarke, N, Howse, JR, “In Situ Imaging and Height Reconstruction of Phase Separation Processes in Polymer Blends During Spin Coating.” ACS Nano, 5 5124–5131 (2011)CrossRefGoogle Scholar
  11. 11.
    Optik für Ingenieure, Grundlagen, 2nd ed. Springer, Berlin Heidelberg (2002)Google Scholar
  12. 12.
    Coffin, D, “Dave Coffin’s Home Page,”

Copyright information

© American Coatings Association 2019

Authors and Affiliations

  1. 1.Institute of Printing Science and TechnologyTechnische Universität DarmstadtDarmstadtGermany

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