Abstract
The goal of nondestructive evaluation is to obtain information about the state of a structural or electronic component that will allow a quantitative assessment of its future serviceability. Because of the ability to penetrate opaque media, ultrasound is one of the most widely used forms of interrogating energy. This paper will consider several current problem areas, ranging from the measurement of material properties such as porosity or grain structure through the characterization of the nature of discrete flaws and the determination of their size and shape. In each case, an interpretation of the measurement in terms of elastic wave scattering theory will be followed by a discussion of the inverse theories used to interpret the data, with emphasis on assumptions required to obtain unique solutions. The presentation will conclude with a discussion of future directions of needed research.
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