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Measurement of attenuation in a sample with nonparallel surfaces
1Department of Materials Science and Engineering, Edison Joining Technology Center, The Ohio State University, 1248 Arthur E. Adams Drive, Columbus, OH 43221, USA.
Abstract:
Ultrasonic attenuation in solids is an important characteristic of structural materials related to their microstructure. It is well known that attenuation measurements in solids require that the front and back surfaces of the sample be parallel. In this paper, an immersion method for attenuation measurement in a sample with nonparallel surfaces is developed. The maximization method is based on independent alignment of the transducer orientations for maximizing each of the multiply reflected signals received. The experiment is accompanied by a measurement model that provides a diffraction correction of the ultrasonic beam. The method is compared with that involvingthe normalization procedure, of the sequence of the reflected pulses, by the transducer directivity function.Those independent measurements are in reasonable agreement for the amplitudes of the first few reflected pulses. In general, the maximization method is advantageous for attenuation measurements by immersion experiments.
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