Review of Progress in Quantitative Nondestructive Evaluation
The time-of-flight diffraction (TOFD) technique is one of the most common sizing methods in practical use by industry today. This method was developed over 40 years ago and is based on the technology and state of knowledge present at that time. A combination of phased arrays and equivalent flaw sizing methods are proposed as the foundation for a new generation of sizing methods that go beyond TOFD sizing.
American Institute of Physics
Schmerr, Lester W. Jr.; Engle, Brady J.; Sedov, Alexander; and Li, Xiongbing, "Ultrasonic flaw sizing—An overview" (2012). Center for Nondestructive Evaluation Conference Papers, Posters and Presentations. 5.