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A look at the conference program: SESSION C Part 2

To shorten the wait for the 14th ThGOT and the 6th Optics Colloquium we would like to give you a small foretaste of our numerous exciting technical presentations in the coming weeks.

 

 

In-situ wetting/functional analysis of surfaces using scattered light sensor technology
Nadja Felde, Fraunhofer Institute for Applied Optics and Precision Engineering (IOF), Jena

 

 

Knowledge and quantification of the structural characteristics of a surface play an essential role in the sensible specification and control of roughness structures for optimum optical as well as functional, such as superhydrophobic or oleophobic, properties. For a comprehensive characterization, different measurement techniques often have to be combined, since only in this way can all functionally relevant structures be detected. In addition to common topographic characterization methods (AFM, WLI, LSM), scattered light methods are increasingly establishing themselves for the highly efficient, non-contact and fast determination of roughness and defects. For this purpose, Fraunhofer IOF has continuously developed scattered light measurement systems that meet the requirements of a wide range of applications - from machine components to optical surfaces with nanostructures and super-smooth high-end optics. Accordingly, the pool of scattered light measurement technology includes complex goniometer-based laboratory systems as well as compact scattered light sensor technology, which can be directly integrated into the production process for quality control.

 

Using the detector matrix-based sensor developed at Fraunhofer IOF, a so-called flying setup is currently being realized, which is also sensitive to nanostructures and can thus serve the above-mentioned fields of application. The insensitivity to vibrations also enables the integration of this new setup into various other measurement systems. Using the example of integration into a contact angle analysis system, initial results for the in-situ characterization of functional surfaces using scattered light sensor technology will be presented.

 

This talk will be presented in SESSION C: NEW MEASUREMENT METHODS IN SURFACE ENGINEERING on March 13, 2019 at 11:40 am.

 

Characterization of laser-assisted fabricated colored metal oxide films
Mandy Hofmann, Wildau University of Applied Sciences - INW/ Physical Technologies and Energy Systems, Photonics, Wildau

 

 

In laser material processing of surfaces, various factors interact (wavelength and operating mode of the laser, general pulse properties, the beam and gas guidance, material properties such as reflection, thermal conductivity, roughness...), which influence the result because the coherent radiation is focused on small areas. Due to this property of the laser, very high power densities can be available for the interaction process between environment, surface and laser, which can then be used for various applications. A very common process is the marking of components, assemblies or finished products in a wide range.

 

In systematic investigations, the process of layer formation as a function of various laser parameters, gas compositions of the environment and surface properties (including surface roughness) will be quantitatively investigated both optically (reflectometry, scattered light measurement, Raman spectroscopy, microscopy,...) and topographically (tactilely by means of profilometry and atomic force microscopy and optically by means of laser scanning microscopy) and selected results will be presented. The main focus is on the investigation of the laser-induced modification of surface-near boundary layers, the structure formation at the surface as well as the chemical material behavior.

 

This talk will be presented in SESSION C: NEW MEASUREMENT METHODS IN SURFACE ENGINEERING on March 13, 2019 at 1:10 pm.