Thickness measurements with eddy current and ultrasonic techniques

In industrial applications, innovative solutions for thickness measurements are deeply investigated in this last years. In particular, technical solutions characterized by proper metrological performance together with small size, low cost, and easy integration in automated systems, are pursued with the aim of operating within the modern Industry 4.0 scenario. In these scenarios, the paper describes the operating and the improvement of two thickness measurement techniques suitable for the purpose. In particular, the first technique is based on the induction of eddy currents (EC) in conductive materials, while the second technique is based on ultrasonic (UT) propagation within materials. An experimental analysis is carried out to verify the metrological performance of the two proposed techniques. The obtained results have shown that both the methods allow metrological and application performance suitable for the typical industrial requirements.