ultrasonic techniques and device for detection and identification of impurities, for example, the ice on the surface of a structure

摘要

The method and the device make it possible to detect the presence of de-icing fluid, water, melting snow or ice on the surface of a structure. The device comprises a probe (10) having a delay block (16) which has an interface flush with the surface of the structure, and transducers (20,22) for emission and reception. The block has an acoustical impedance lying between 2.7 and 3. Excitation and analysis means (12) make it possible to send an electrical pulse to the emission transducer (20) and compare the amplitude and phase of the interface echo with a reference echo corresponding to the absence of contaminant. IMAGE