
Proceedings Paper
Omni-directional lens for structure-borne wave focusing and energy harvestingFormat | Member Price | Non-Member Price |
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Paper Abstract
In this paper, a Luneburg lens is explored for omnidirectional structure-borne wave focusing both numerically and
experimentally. The proposed lens is formed by radially distributed blind holes with different diameters based on the
gradient index phononic crystal theory. The radial orientation and diameter of the holes are determined according to the
refractive index distribution which is guided by finite-element simulations of the lowest asymmetric mode Lamb wave
band diagrams. According to this design, the wave travels slower at the center of the lens and converges at the focal spot
which is on the circular lens boundary. Wave simulations are performed in COMSOL Multiphysics® under plane wave
excitation from a line source and wave focusing is observed at the opposite border of the lens with respect to the
incoming wave direction. Experimentally measured wave fields with a scanning laser vibrometer successfully validate
simulated wave focusing. Furthermore, omnidirectionality is verified by testing the lens under plane wave excitation
from different directions. With piezoelectric energy harvesters located at the boundary of the Luneburg lens substantially
larger power output can be obtained as compared to the baseline case of energy harvesting without the lens on the
uniform plate counterpart for the same incident plane wave excitation.
Paper Details
Date Published: 11 April 2017
PDF: 7 pages
Proc. SPIE 10164, Active and Passive Smart Structures and Integrated Systems 2017, 101641V (11 April 2017); doi: 10.1117/12.2260358
Published in SPIE Proceedings Vol. 10164:
Active and Passive Smart Structures and Integrated Systems 2017
Gyuhae Park, Editor(s)
PDF: 7 pages
Proc. SPIE 10164, Active and Passive Smart Structures and Integrated Systems 2017, 101641V (11 April 2017); doi: 10.1117/12.2260358
Show Author Affiliations
S. Tol, Georgia Institute of Technology (United States)
F. L. Degertekin, Georgia Institute of Technology (United States)
F. L. Degertekin, Georgia Institute of Technology (United States)
A. Erturk, Georgia Institute of Technology (United States)
Published in SPIE Proceedings Vol. 10164:
Active and Passive Smart Structures and Integrated Systems 2017
Gyuhae Park, Editor(s)
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