Abstract
In an attempt to develop models for nondestructive testing of flaw characterization we have simulated “flaws” by using metal circular reflectors in water. A broad-band ultrasonic beam was incident on the reflectors. The scattered wave amplitudes were measured as a function of frequency for fixed angles and as a function of angles for several frequencies. In our previous work [Laszlo Adler and H.L. Whaley, J. Acoust. Soc. Am. 51, 881 (1972)], the frequency distribution of the scattered sound wave was related to the size and orientation of the reflector by an approximate theory. This theory assumed that the wavelets originating from the extreme edges of the reflector will interfere. Now we have adopted a theory from the diffraction of electromagnetic waves by aperture [Keller, Appl. Phys. 28, 426 (1957)]. An expression for the diffracted amplitude was calculated as a function of frequency and angle for several reflector sizes. The result compares favorably with our experiments. [This research was sponsored by the Center for Advanced NDE operated by the Science Center, Rockwell International, for the Advanced Research Projects Agency and the Air Force Materials Laboratory under Contract F33615-74-C-5180.]
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