Experimental results in ultrasound reflection tomography for nondestructive testing

Abstract

This paper is concerned with ultrasound reflection tomography for nondestructive testing. The filtered backpropagation algorithm is used for reconstruction of images. Computer simulation and experimental results are presented. Our results show that, although the influence of the diffraction has been neglected, experimentally it has been established, that quite a good quality of reconstructed images can be obtained. It is possible to resolve nonhomogenities even when distance between them is only 0.83l. It is also possible to reconstruct images of objects having complex geometry. It was proved that using deconvolution it is possible to reduce the influence of the shape of the input signal and the reverberation noise. Though there are limitations caused by diffraction effects to the use of ultrasonic tomography for nondestructive testing, we have shown, that good quality images of the different objects could be obtained.