Method for measuring the adhesion of a coating on a substrate by acoustic coupling of a transducer by means of a thin layer

摘要

The process involves emitting ultrasound waves by a transducer (3), towards a substrate (1) and a coating (2). A quality factor is calculated as a ratio between amplitudes of echoes related to two reflections of ultrasonic sound on a substrate-coating interface or an air- coating interface. The adherence of the coating is determined from a function that correlates the quality factor and rupture constraint of the coating.