Innovations in functionalized glass surfaces are often achieved by applying thin-films in architectural glass, smart glass, display panels, solar glass, heating and light management glass, mobile friendly glass, some passive or even with interactive functions like touch-pads. The desired thin-film effects are created by deposition (PVD, CVD, slot-die..), modification (annealing, drying..), removal or structuring of layers (polishing, scribing, etching..) in vaccum or at athmospheric conditions, along with sophisticated material configurations, well-optimized layer stacks and advanced processes. Therefore, process control is crucial for cost efficient production of advanced layers becomes a crucial aspect for high-volume production such as R2R or S2S manufacturing.
Hence we propose solutions for required quality monitoring and process control. The presentation describes the non-destructive method of high-frequency eddy current sensing based on inductive layer characterization with a focus on opportunities for glass coating process monitoring. Innovative sensor capabilities enable process feedback loops and yield benefits. Additionally, the integration challenges for minimized installation space under high-vacuum and high-temperature conditions up to 600°C are addressed.
New designs such as miniaturized sensor solutions as well as a hand-held sensor system are demonstrated. The latter allows to evaluate the status of built-in architectural glass in terms of emissivity. Correct installation of IGUs to serve proper heat and light management of facades for improved energy usage can be tested on site. Moreover, the portable solution enables refurbishing service providers to test existing window glass installations for aging effects of the silver layers and whether glass panels can be selectively recycled and re-used at present emissivity standards.