http://www.k-wave.org/forum/topic/different-pressure-amplitudes-at-co-located-source-and-sensors Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 18:35:35 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/different-pressure-amplitudes-at-co-located-source-and-sensors#post-6391 Sun, 08 Apr 2018 18:14:05 +0000 Bradley Treeby 6391@http://www.k-wave.org/forum/ <p>Hi muhammad.omer,</p> <p>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.</p> <p>Hope that helps, </p> <p>Brad. </p> http://www.k-wave.org/forum/topic/different-pressure-amplitudes-at-co-located-source-and-sensors#post-6370 Thu, 22 Mar 2018 21:08:42 +0000 muhammad.omer 6370@http://www.k-wave.org/forum/ <p>I want to further add here the values of some other variables that I am using to simulate:</p> <p>source_freq = 0.25e6;<br /> source_mag = 2;<br /> Nx = 128;<br /> Ny = 128;<br /> dx = 50e-3/Nx;<br /> dy = 50e-3/Ny;<br /> medium.sound_speed = 1500;<br /> medium.alpha_coeff = 0;<br /> medium.alpha_power = 1.5; </p> http://www.k-wave.org/forum/topic/different-pressure-amplitudes-at-co-located-source-and-sensors#post-6367 Thu, 22 Mar 2018 18:56:25 +0000 muhammad.omer 6367@http://www.k-wave.org/forum/ <p>Hello,</p> <p>I am running the "example_tvsp_homogeneous_medium_monopole.m" example with co-located source and sensor positions:</p> <p>source.p_mask(64,64) = 1;<br /> sensor.mask(64,64) = 1;</p> <p>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:</p> <p>rms(source.p) gives 1.4158<br /> rms(sensor_data.p) gives 0.4966 </p> <p>I would appreciate if someone can explain that to me.</p> <p>Thanks </p>