Abhängigkeit der Echoanzeige von nutartigen Reflektoren, Prüfkopfschallfeld und von der Frequenz
(1977)
The authors discuss the need for utilizing several techniques in orderto determine reliably flaw size. they suggest focusing probes, acousticholography, and possibly other techniques in the future. manipulating systemsmust be able to carry out scannings with different parameters, for instance atandem technique with different probe distances.