The quality control of thin layers, especially during or shortly after production, is essential for many products. For this application the LLF develops imaging-ellipsometers for inline use.

For laboratory measurements a commercial imaging ellipsometer is available, too.  

Contact: Ferdinand Bammer, +43 1 58801 311616, ferdinand.bammer@tuwien.ac.at, TISS, opens an external URL in a new window

Based on a polarization camera the system is especially suited for cylindrical samples, like bottles, pipes, or foils on rolls in R2R-production. Due to the high sensitivity on polarization changes the measurement is successful also for small differences of the refractive indices of layer and substrate. With up to 24 fps fast applications in the laboratory as well as inline production lines are addressed.

In the following results on SiO2-coated bottles, PDMS-coated vials, and on PEDOT-coated foils are shown.  

© Ferdinand Bammer

Messaufbau

Setup for 360 °-panoramic measurements on SiO2-coated PET-bottles.

Based on an industrial IR-camera, the system is especially suited for the 2D-measurement of the thickness distribution of dielectric layers (oil, lubricants, laquers, undercoatings…) on metallic substrates (sheet metals or foils, e.g. steel or Al). A particularly important application is the control of precise oil layers in rolling- and deep-drawing-lines. With the long wave light a high robustness against varying roughness is achieved.