A review of available results on non-destructive testing physical systems, using the concept topological sensitivity, is presented. This mathematical tool estimates sensitivity a set measurements in some given sensors, distributed along system, to defects/flaws that produce degradation system. Such manifests itself properties The good performance this general purpose post-processing method revi...

The paper deals with the identification of a crack-like defect in coated wedge based on ultrasonic nondestructive testing. authors propose an approach followed by determination its geometrical parameters. is shadowed testing method combined deep machine learning technologies. A wedge-shaped area inspected for presence internal defect. On one edge there source vibrations, opposite receiver. Pass...

In this study, a flexible ultrasonic transducer (FUT) was applied in a laser ultrasonic technique (LUT) for non-destructive characterization of metallic pipes at high temperatures of up to 176 °C. Compared with normal ultrasound transducers, a FUT is a piezoelectric film made of a PZT/PZT sol-gel composite which has advantages due to its high sensitivity, curved surface adaptability and high te...

The interface pressure between the cable attachment and body is crucial for stable long-term operation of cable. To solve issue insulation characteristics’ damage caused by transducer measurement method, a non-destructive testing method silicone rubber using nonlinear ultrasound presented. Initially, study analyzes propagation characteristics ultrasonic waves at cross-linked polyethylene rubber...

This paper has carried out an experimental program to establish a relatively accurate relation between the ultrasonic pulse velocity (UPV) and concrete compressive strength. The involved testing cubes of (100) mm prisms (100×100×300) cast with specified test variables. samples are tested by using equipment two methods, direct (DUPV) surface (indirect) (SUPV) for each sample. obtained results we...