k-Wave

1. muhammad.omer
   

   Member
   Joined: Nov '14
   Posts: 2

   Hello,

   I am running the "example_tvsp_homogeneous_medium_monopole.m" example with co-located source and sensor positions:

   source.p_mask(64,64) = 1;
   sensor.mask(64,64) = 1;

   Ideally, I would expect exact same amplitudes of both pressure curves (Input Pressure Signal and Sensor Pressure Signal) but what I get is attenuated pressure at sensor with following root mean square values:

   rms(source.p) gives 1.4158
   rms(sensor_data.p) gives 0.4966

   I would appreciate if someone can explain that to me.

   Thanks

   Posted 6 years ago #

2. muhammad.omer
   

   Member
   Joined: Nov '14
   Posts: 2

   I want to further add here the values of some other variables that I am using to simulate:

   source_freq = 0.25e6;
   source_mag = 2;
   Nx = 128;
   Ny = 128;
   dx = 50e-3/Nx;
   dy = 50e-3/Ny;
   medium.sound_speed = 1500;
   medium.alpha_coeff = 0;
   medium.alpha_power = 1.5;

   Posted 6 years ago #

3. Bradley Treeby
   

   Developer
   Joined: Mar '10
   Posts: 1,640

   Hi muhammad.omer,

   When you define a pressure source in k-Wave, you are specifying an injection of mass which adds to the pressure already in the medium. The output is the solution the wave equation given this time varying source, which won't be the same.

   Hope that helps,

   Brad.

   Posted 6 years ago #

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