Three component time reversal: Focusing vector components using a scalar source
Ulrich, T. J × Van Den Abeele, Koen Le Bas, Pierre-Yves Griffa, Michele Anderson, Brian E Guyer, Robert A #
Amer inst physics
Journal of applied physics vol:106 issue:11 pages:1-7
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.