Computer-aided modelling of ultrasonic probes

The diploma thesis deals with the realisation of electro-acoustic equivalent circuit modelling in a computer in order to gain insight into the transducing characteristics and the time-dependent functioning of a probe. The model thus established is adapted to the design of a phased-array probe, and agreement of model with real probe is verified experimentally. The second part of the thesis discusses methods of process identification and their application in the field of ultrasonic testing and measuring. Non-recursive and recursive algorithms are compared, a Kalman filter is used for recursive assessment. The search for an optimal system array is done by an automated procedure. Apart from parameterization of probes on the basis of measured data and the model established, examples of application of the identification patterns are given, discussing classification of materials defects and inverse filtering. (orig./HP)