Accession Number:

ADA523087

Title:

Sonic Gradient Index Lens in Water

Descriptive Note:

Research rept.

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC ACOUSTICS DIV

Report Date:

2010-06-21

Pagination or Media Count:

10.0

Abstract:

We study the acoustic scattering properties of a phononic crystal designed to behave as a gradient index lens in water, both experimentally and theoretically. The gradient index lens is designed using a square lattice of stainless-steel cylinders based on a multiple scattering approach in the homogenization limit. We experimentally demonstrate that the lens follows the graded index equations derived for optics by mapping the pressure intensity generated from a spherical source at 20 kHz. We find good agreement between the experimental result and theoretical modeling based on multiple scattering theory.

Subject Categories:

  • Numerical Mathematics
  • Acoustics
  • Crystallography
  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE