SUPERsaft Ultrasonic Image Reconstruction

Publisher Summary This chapter discusses SUPERimposed SAFT analysing technique SUPERsaft, which has been developed for accurate sizing of cracks caused by fatigue and corrosive environments. The primary inspection measurements are based on digitized A-scans collected by portable field equipment. The final results are obtained by subsequent signal processing on a PC-based evaluation system. The technique is based on a statistical-geometrical reconstruction scheme, utilizing echo amplitude and transit time information from the original A-scan distributions. For a selected section through the inspected object, the technique will assign a probability distribution to the picture elements of the section plane. The probability assigned to a specific picture element is derived from the sum of locally contributed echo amplitudes from all A-scans included in the reconstruction. The model is based on parameters characterising transducer, material, and geometry. At any chosen location within the reconstructed image, the reflection characteristics of the appointed reflector can be visualised.