AcousticMedium

Package: kwave.toolbox Superclasses: kwave.toolbox.GridInput

Class used to define the acoustic medium properties for a simulation.

Syntax

medium = AcousticMedium(kgrid);

Description

This class is used to define the acoustic medium properties. The constructor takes an object of the kwave.toolbox.Grid class which defines the grid size. All medium properties can be scalar or have the same size as the grid with the exception of alphaPower and soundSpeedReference, which must be scalar. The soundSpeed and density must be defined.

Examples

Define the grid and medium objects, and assign the sound speed and density.

  kgrid = kwave.toolbox.Grid([128, 128], 1e-3);
  medium = kwave.toolbox.AcousticMedium(kgrid);
  medium.soundSpeed = rand(medium.gridSize);
  medium.density = rand(medium.gridSize);
  medium.absorptionCoeff = rand(medium.gridSize);
  medium.absorptionPower = rand();

Properties

• soundSpeed - (single) Compressional sound speed [m/s].
• soundSpeedReference - (single) Reference compressional sound speed used in the k-space correction [m/s]. Automatically defined in kWaveAcoustic if not defined by the user.
• density - (single) Mass density [kg/m^2].
• absorptionCoeff - (single) Power law attenuation coefficient [dB/(MHz^y cm)].
• absorptionPower - (single scalar) Power law attenuation power.
• BonA - (single) Parameter of nonlinearity.

In order to model absorption both absorptionCoeff, and absorptionPower must be defined, and solver.absorptionType must be set for the acoustic solver

See Also

• GridInput
• AcousticSolver