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| | surface |
 | | In simple terms, surface tension, respectively, surface energy, is to be understood as being a physically measurable tensile stress which can be determined by the molecules in the boundary layer of the substrate and the adhesion strength of these molecules. |
 | | An increase in the surface tension, or a 'molecular roughening', of the material surfaces is currently achieved with industrial pre-treatment methods using solvents, primer, plasma, UV radiation, flame-treatment, ozone gassing and corona. |
 | | As already stated in the introductory part, it is known according to the invention that two by 90° displaced optical substrate transmissions and their beam displacement along the optical x-axis generate scattering and diffraction effects on both sides of the boundary layer area which are material-specifically dependent on the used wavelength. |
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