Systems and methods for acoustic mode conversion
AssigneeElwha LLC
InventorYaroslav A. Urzhumov
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Abstract
The present disclosure provides systems and methods associated with mode conversion for ultrasound and acoustic radiation devices. A mode converting structure (holographic metamaterial) is formed with a distribution of acoustic material properties selected to convert an acoustic pressure pattern from a first mode to a second mode to attain a target radiation pattern that is different from the input radiation pattern. A solution to a holographic equation provides a sufficiently accurate approximation of a distribution of acoustic material properties to form a mode converting device. One or more optimization algorithms can be used to improve the efficiency of the mode conversion and generation of the acoustic mode converter.
Claims40
An apparatus, comprising:
- a mode converting structure with a volumetric distribution of acoustic material properties configured to be positioned relative to an acoustic radiation (AR) device to modify an acoustic field profile of the AR device from an input mode to an output mode for a finite frequency range,
- wherein the mode converting structure is divided into a plurality of sub-wavelength voxels,
- wherein each voxel has a maximum dimension that is less than half of a wavelength of a frequency within the finite frequency range, and
- wherein each voxel is assigned one of a plurality of acoustic material properties to approximate the distribution of acoustic material properties of the mode converting structure.
Dependencies are inferred from the claim text.