3. Defect Characterization by Quantitative Ultrasonics
The first Born approximation provides a useful means to study scattering of ultrasound by various defects. In particular, it seems to yield qualitatively good results for the scattered power, when averaged over a range of frequencies. Features of the scattered power that have been discovered by this method will be reviewed. Closer study of some of these features leads to a step procedure to characterize an oblate spheroidal defect; to determine its orientation and shape. Procedures for extension to other shapes can also be given. Areas of future development will be indicated.
Domany, E., "Utilization of Physical Features of Scattered Power for Defect Characterization" (1978). Proceedings of the ARPA/AFML Review of Progress in Quantitative NDE, September 1976–June 1977. 5.