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A comparative study of transient waves in random (polycrystalline) media |
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| Authors: | A W Lipsett R J Tait J B Haddow A I Beltzer |
| Affiliation: | (1) Department of Mechanical Engineering, University of Alberta, T6G 2G8 Edmonton, Canada;(2) Department of Mathematics, University of Alberta, T6G 2G1 Edmonton, Canada;(3) Department of Mechanical Engineering, University of Victoria, V8W 2Y2 Victoria, Canada;(4) Holon Institute for Technological Education, affiliated with Tel Aviv University, P.O. Box 305, 58102 Holon, Israel |
| Abstract: | The paper investigates the transient response of a random medium as predicted by two methods, a perturbation scheme and a causal approach. It is shown by direct computation of a pulse propagation that the perturbation scheme yields an  advanced response inconsistent with the physical realizability of the medium. The causal model as well as a modified perturbation scheme exhibit a physically reasonable behavior. |
| Keywords: | Casuality effective medium ultrasonics polycrystalline medium |
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