Integrated Models of Ultrasonic Examination for NDT Expertise

CEA Program for Multiple-Technique Non Destructive Testing: The CIVA System

“…Mephisto [1,2] simulates the complete testing process of a piece, taking account of the transducer scanning and predicting the echo structure arising from the defects and the piece boundaries.…”

New Developments in Ultrasonic NDT Modeling in CIVA

“…The two main models developed over the past years at CEA have been presented in this review [1,[3][4][5]. Therefore, we will only recall their main characteristics and briefly indicate the underlying theories on which they are based.…”

“…Only approximate ones offer the necessary high computing performances. Ultrasonic modeling at the French Atomic Energy Commission (CEA) is based onto continuous developments of two models covering realistic commonly encountered NDT configurations [1]. The associated softwares are implanted in the CIVA system developed at CEA for processing and imaging multiple technique NDT data [2].…”

An Inverse Method for Cracks Characterization from Ultrasonic Bscan Images

“…The map A: P ~ Y, where P is the OSC parameter space and Y the data parameter space, is defined in terms of the non-linear relationship between the OSC parameters and the Bscan image. Let us describe it in abstract form of an operator equation of the first kind (2) where p E P is the OSC parameter vector and y E Y is the data set. Notice that in practice map A also depends on the control configuration parameters, the ultrasonic field profile, etc., that are supposed to be known.…”

“…In this paper, we present an inverse method for determining the geometrieal eharaeteristies of OSC's from ultrasonie Bsean images. The direet model used for the inversion proeedure predicts synthetic Bsean images of uhrasonie examination of bloeks eontaining planar defeets interrogated by foeused probes [1,2] . …”