Importance

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Abstract

Apparatus for determining, through an interposed medium, the mechanical properties of a solid comprised of more than one material, the solid having a surface. The apparatus includes a) ultrasonic transmission apparatus located in a first location for transmitting ultrasonic waves through the interposed medium and through the solid and generally parallel to the surface, b) at least one ultrasonic receiver unit located in each of second and third locations for receiving the ultrasonic waves, wherein the first, second and third locations are colinear along the surface, c) apparatus for locating the at least one receiver unit such that a first receipt time of an ultrasonic wave from the surface to the at least one ultrasonic receiver unit at the second location is generally equivalent to a second receipt time from the surface to the at least one ultrasonic receiver unit at the third location, d) apparatus for receiving a time-based output signal from each of the at least one ultrasonic receiver unit, e) apparatus for transforming at least two of the output, signals to the frequency domain thereby to produce frequency domain signals and f) apparatus for determining, from the frequency domain signals, frequency values and their corresponding propagation speeds, for each of the materials within the solid.

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First Claim