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Investigations for the improvement of SAFT imaging quality of a large aperture ultrasonic system
(2015)
In parallel to the hardware development of an ultrasonic system for the investigation of thick concrete structures, a software package for interactive reconstruction of data for that special arrangement of ultrasonic transducers was developed. The system which is presented in a further contribution to this conference as "large aperture ultrasonic system" (LAUS) requires special features to the evaluation software because measuring positions can be in a non equidistant grid and there is the possibility to improve the measurement by adding measuring points interactively.
Starting from theoretical considerations to the image generation by measuring arrangements of synthetic aperture problems, solution approaches for imaging with SAFT (Synthetic Aperture Focusing Technique) algorithms in space and frequency domain of data from insufficient grid density are presented.
A wide range of issues that may arise in the application is precalculated by simulations and experimental studies, so that unavoidable artifacts can be identified and classified. A special focus is put on the application of thick concrete structures considering missing measuring points in a grid, grating lobes and surface waves.