k-Wave User Forum » Topic: Problem when sending and receiving particle velocity

k-Wave User Forum » Topic: Problem when sending and receiving particle velocity http://www.k-wave.org/forum/topic/problem-when-sending-and-receiving-particle-velocity Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 14:16:23 +0000 http://bbpress.org/?v=1.0.2 <![CDATA[Search]]> q http://www.k-wave.org/forum/search.php sschlatt on "Problem when sending and receiving particle velocity" http://www.k-wave.org/forum/topic/problem-when-sending-and-receiving-particle-velocity#post-5939 Mon, 22 May 2017 19:00:48 +0000 sschlatt 5939@http://www.k-wave.org/forum/ Hi, Thanks for your reply. I could fix the error using a larger PML. S. Schlatter Bradley Treeby on "Problem when sending and receiving particle velocity" http://www.k-wave.org/forum/topic/problem-when-sending-and-receiving-particle-velocity#post-5934 Sun, 21 May 2017 16:00:18 +0000 Bradley Treeby 5934@http://www.k-wave.org/forum/ Hi sschlatt, You can only relate pressure and particle velocity in this way in 1D (i.e., for a plane wave travelling in the x-direction). In the more general case, the pressure and particular velocity won't be in phase, and the specific acoustic impedance will be complex. Brad. sschlatt on "Problem when sending and receiving particle velocity" http://www.k-wave.org/forum/topic/problem-when-sending-and-receiving-particle-velocity#post-5927 Mon, 15 May 2017 09:28:37 +0000 sschlatt 5927@http://www.k-wave.org/forum/ Hi, I would like to simulate US recording of a heterogeneous medium. I use a transducer object as a source. But because I would like to include directivity of transducer elements at reception (NOT like the directivity setting of the k-wave toolbox), I use a different sensor defined using a mask, which records ux (ux is needed to apply the directivity). The raw-data I obtain by recording ux is however very strange and the pressure calculated by <code>P = -ux*c0*rho0</code> is not close to the pressure recorded. With one difference in acoustic impedance (one interface) for example, pressure has a zero mean inside the homogeneous medium (which is correct) and one echo (the interface), the pressure calculated using the velocity however has a non-zero mean! What could cause this behaviour? Could it be related to the configuration? Thanks for your help!