k-Wave

1. Maschbau
   

   Member
   Joined: Aug '15
   Posts: 2

   Hello everybody,

   I have created a simulation of an echo pulse test (5 MHz) in k-wave. I used different element sizes (10 - 40 um) and time steps (3 - 12 ns). Unfortunately, I have noticed that the TOF changes in the range of almost 5% and the amplitudes by up to 40%.
   I use the following solver: kspaceFirstOrder2D
   Had someone similar problems or know what the error can be?

   Many Thanks

   Torben

   Posted 7 years ago #

2. Bradley Treeby
   

   Developer
   Joined: Mar '10
   Posts: 1,643

   Hi Torben,

   It's hard to say exactly without seeing your code, but depending on how you have defined the source, the change in amplitude with the grid spacing might be expected. See this post and this post.

   For the time of flight, how is this extracted?

   Brad.

   Posted 7 years ago #

3. Maschbau
   

   Member
   Joined: Aug '15
   Posts: 2

   Hi Brad,

   thank you for the answer.
   I saw the difference in time of flight by plotting the a-scans (recorded at the same receiver) in the same figure using different grid sizes.

   Best

   Torben

   Posted 7 years ago #

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