k-Wave

1. jwjs
   

   Member
   Joined: Jun '11
   Posts: 14

   Is it possible to retrieve particle displacement (2-D and/or 3-D) using k-Wave?

   From what I gather we can calculate the instantaneous displacement from looking at the pressure (assuming a single frequency) from the following http://en.wikipedia.org/wiki/Particle_displacement. But what about displacement at varying frequency (such as modelling two transducers in a medium at different freq.) or displacement (i.e. oscillation at an instance of time) along each dimension?

   Basically I want to model particle displacement and know the direction(s) in which to displace at any instance in wall clock time. With complex pressures it would be possible to investigate my imaginary term and decide on direction(s) due to having phase information, but from what I've seen the pressures are returned as scalars. I suppose I could use some change in time corresponding to quarter wavelengths to get my gradient, but I'm hoping there's a more straightforward way or something I'm glancing over in the physics. Any suggestions?

   Posted 13 years ago #

2. bencox
   

   Developer
   Joined: Mar '10
   Posts: 292

   Hi jwjs,

   As well as recording the acoustic pressure as a function of time, you can record the particle velocity (see Recording The Particle Velocity Example). If you are interested in the displacement at just a few points then perhaps you could record the velocity there as a function of time and integrate it to give displacement. If you want the displacement everywhere in the domain you could still do it in principle by defining sensors at every pixel, but it starts to become a bit memory intensive.

   You can also input the velocity vector at chosen points, if you want to (see
   Dipole Point Source In A Homogeneous Propagation Medium Example) to model the velocity of the surface of a transducer, for instance.

   Hope that helps,

   Ben

   Posted 13 years ago #

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