期刊
JOURNAL OF APPLIED PHYSICS
卷 106, 期 11, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3259371
关键词
acoustic signal processing; elastic waves; ultrasonic materials testing; ultrasonic propagation
资金
- LDRD
- European FP6 Grant AERONEWS [AST-CT-2003-502927]
- Flemish Fund for Scientific Research [0206.02, 0554.06, 0443.07]
- Research Council of the Katholieke Universiteit Leuven [OT/07/051]
In acoustics, it is known that, for a given response signal at an arbitrary location, reciprocity and time reversal (TR) can be used to focus high levels of acoustic energy at that position. In solid media, elastic waves generally induce different disturbances in three directions. In this paper, both experimental and numerical wave propagation results for solid materials demonstrate the ability to use a scalar source, a three component detector and the reciprocal TR process to selectively focus each of the different vector components, either individually or collectively. The principle is explained from an analytical point of view. The numerical and experimental study demonstrates excellent temporal and spatial focalization. Applications of the selective vector component focusing can be found in damage imaging techniques using both linear or nonlinear ultrasonic waves.
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