Review of Progress in Quantitative Nondestructive Evaluation
Ultrasonic phased array transducers can be used to extend traditional time-of-flight diffraction (TOFD) crack sizing, resulting in more quantitative information about the crack being obtained. Traditional TOFD yields a single length parameter, while the equivalent flaw time-of-flight diffraction crack sizing method (EFTOFD) described here uses data from multiple look-angles to fit an equivalent degenerate ellipsoid to the crack. The size and orientation of the equivalent flaw can be used to estimate the actual crack size.
American Institute of Physics
Engle, Brady J.; Schmerr, Lester W. Jr.; and Sedov, Alexander, "Equivalent flaw time-of-flight diffraction sizing with ultrasonic phased arrays" (2012). Center for Nondestructive Evaluation Conference Papers, Posters and Presentations. 2.