A1.3 - Detection of Coatings and Measurement of Coating Thickness on Technical Substrates using Surface Acoustic Waves in a Waveguide Configuration

Gerhard Lindner, Martin Schmitt, Katrin Schmidt, Hendrik Faustmann, Sandro Krempel & Josefine Schubert
Surface acoustic waves turned out to be very sensitive to deposition layers on their propagation path on the solid substrate, which both influence the propagation velocity of the waves and their amplitude. In our approach, Lamb waves are excited on arbitrary technical substrates like metals, glass or plastics with a thickness of not more than the acoustic wavelength via interdigital piezoelectric transducers attached to the backside of the substrate. The performance of this approach was...
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