Abstract This article describes the development of an application to capture and process ultrasonic signals that will lead to the formation of flight time diffraction images, TOFD. In this way the theoretical basis of operation of this technique is presented establishing concepts such as type A and type D scanning. In addition, the ultrasonic waveforms that are used in this technique are presented. Application development is carried out through layered programming, which consists of three modules: information capture, information storage and finally data processing and graphing. However, the ultrasonic signal acquisition system designed and implemented in the laboratories of the Santo Tomás University of Bogotá D.C is presented as an alternate ultrasound system. For the verification of the system an exploration is carried out on a steel specimen that intentionally contains a hole inside it and the system determines its existence. In addition, a scan is performed on a steel sample with a weld bead and defects within the bead are verified.