k-Wave

1. hang
   

   Member
   Joined: Oct '16
   Posts: 1

   Hi,

   I'm trying to simulate a transducer with matching layer at front & at back. When I increase the impedance to 1.8MRayls, k-wave crashed when using 20MHz frequency at 1300 m/s medium.

   Anybody has the similar experience?

   Many thanks!

   Best,

   Posted 7 years ago #

2. Bradley Treeby
   

   Developer
   Joined: Mar '10
   Posts: 1,643

   Hi hang,

   What do you mean by k-Wave crashed? Did you receive an error message?

   Brad.

   Posted 7 years ago #

3. binpersonal
   

   Member
   Joined: May '13
   Posts: 7

   Hi, Brad,

   I also want to ask is there a way to simulate several different thickness of matching layers?

   I tried a few times with impedance and density of several matching layers as following, there are long ringing in the waveform and it is very difficult to converge even after I use very small time step and grid.

   And which sound speed should I use for transducer at grid row 1 ? the speed of piezoelectric material or the speed for beam-forming (c0)?

   %Matching Layer 1
   sound_speed_map(2:4,:,:) = 3900;
   density_map(2:4,:,:) = 2.02;

   %Matching Layer 2
   sound_speed_map(5:6,:,:) = 2608;
   density_map(5:6,:,:) = 1.173;

   %Lens
   sound_speed_map(7:25,:,:) = 1050;
   density_map(8:25,:,:) = 1.335;

   % properties used to derive the beamforming delays
   transducer.sound_speed = c0; % sound speed [m/s]

   Thank you very much!

   Posted 5 years ago #

4. Bradley Treeby
   

   Developer
   Joined: Mar '10
   Posts: 1,643

   HI binpersonal.

   Are these the values you used for the simulation? If so, the density should be in units of kg/m^3.

   When using the transducer class, the sound speed is the one used to calculate the beam forming delays.

   Brad.

   Posted 5 years ago #

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