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This example demonstrates the use of k-Wave to compute the field pattern generated by a curved single element transducer in two dimensions. It builds on the Point Source In A Homogeneous Propagation Medium Example.
As in the previous example, a time varying pressure source is defined by
assigning a binary source mask source.p_mask (which defines
the shape and position of the source) along with a time varying source input
source.p. Here a single sinusoidal time series is used to drive
a curved transducer element.
% define a curved transducer element source.p_mask = makeCircle(Nx, Nz, 50, 50, 30, pi/2); % define a time varying sinusoidal source source_freq = 0.25e6; source_mag = 0.5; source.p = source_mag*sin(2*pi*source_freq*kgrid.t_array); % smooth the source source.p = filterTimeSeries(kgrid, medium, source.p);
The simulation is again invoked by calling kspaceFirstOrder2D. To allow visualisation of the
source elements within the grid, the source mask is assigned to the optional input
'DisplayMask'. This mask is overlayed onto the plot during the
simulation.
% create a display mask to display the transducer display_mask = source.p_mask; % run the simulation [sensor_data p_final] = kspaceFirstOrder2D(kgrid, medium, source, sensor, 'DisplayMask', display_mask);
The final pressure field is plotted below. Both the transducer focus and the side lobes are clearly visible.
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Point Source In A Homogeneous Propagation Medium | Sensor Element Directivity | ![]() |
© 2009, 2010 Bradley Treeby and Ben Cox.