Abstract

This article proposes using the maximum entropy method (MEM) for processing the ultrasonic echo signals in order to restore the deflectors images with high signal/noise ratio and small lateral petals of the point scattering function. When processing the ultrasonic echo signals, it is possible to take into consideration the pulses propagation paths, together with both their deflections from uneven boundary of inspected object and the respective wave type transformation. In model experiments the images of deflectors were received in two registering modes: in the combined mode - by using the conventional single element probe; in double and triple scan mode - by using the antenna array. The deflection from uneven surface during the echo signals acquisition had been taken into account in both modes. The restored images had a resolution exceeding the one required by Rayleigh criterion. MEM allows obtaining the defect images of low-level lateral petals by processing less than 10 % of echo signals full set.

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