Damir Markučič

Assessment of uncertainty in modelled ultrasonic thickness measurements

Abstract Recently, through several documents ranging from guidelines to standards, it has been suggested to strengthen the quantitative character of non-destructive testing results and its implementation has been proposed. For the study behind this article, the formulated scheme on the ultrasonic thickness measurement has been applied, which is a typical procedure within ultrasonic testing. The regular situation is described, formalized through formulating the accompanied model, and its measurement uncertainty is estimated by using a Monte-Carlo based simulation. The obtained results provide a significant contribution to the approach to evaluate the testing system capability, to its step-by-step improvement as well as to direct tracing of consequences of any change in its characteristics.

Analysis of influential factors for ultrasonic disc size evaluation

Abstract The accuracy and reliability of any ultrasonic testing depends on the calibration procedure and sensitivity settings. In the present experimental research, it has been investigated how the changes of ultrasound beam shape influence the disc size evaluation. It was investigated how three selected factors and their interactions affect the disc size evaluation when probe frequencies are changing what is in correlation with changing the ultrasound beam shape. The experiment revealed that different factors and their interactions are significant for disc size evaluation.