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The paper addresses several techniques of signal processing in case of non-invasive ultrasonic applications. In first the signal oriented modelling of linear systems demonstrates the estimation of wave propagation and mode conversion in layered media. Its reliability in case of curvilinear surfaces, divergent sound fields and non-perpendicular incident with additional interface effects is discussed. In extension the paper deals with the potential of coding techniques to substitute any arbitrary short pulse signal with increased signal to noise ratio in case of high attenuation and reflection loss. The aspects of coded signals will be exemplified on measurement results concerning structure borne sound with dispersion and sound propagation in high attenuating environments. Finally, the statistical processing and the parameter estimation are demonstrated on particular and layered systems.

A3.4 - Signal processing for ultrasonic clamp-on-sensor systems