Principles of the evaluation techniques of the real time non-destructive testing ultrasonic visualization systems

Abstract

Ultrasonic visualization systems (UVS) for non-destructive testing, which operate in a real time mode, were investigated. Usually manufacturers declare, that such UVS are designed for diagnosis of subsurface defects in solids, composite materials etc. So, the measurement operation must be carried out by UVS in order to get quantitative information about defects size and spatial location. This information has to be presented for the user, who makes a decision about tested object’s condition. However, acoustic images, obtained with UVS, do not present the information about defect’s size and spatial location. In this case the diagnostic results (or resulting images) of the UVS, are not reliable enough for making a decision. The metrological evaluation of the UVS is required in order to get the impartial and quantitative estimation of the object’s test results. Such evaluation is value-adding for the acoustic images obtained with UVS. In this work the tasks for the metrological evaluation of the UVS are presented. The characteristics for the metrological UVS evaluation are proposed. The instrumentalities for determination of these characteristics are proposed and investigated. The methodology for the metrological evaluation of the UVS is presented.