k-Wave

1. ZHANG Fan
   

   Member
   Joined: Oct '16
   Posts: 9

   Hi,

   I am a student learning to use K-Wave toolbox to do some simulation about PAT. However, I have some problems when learning the example:Sensor Element Directivity in 2D.

   I am confused about that if every element has a size of 16 grid spacings, then 31 elements will exceed the size of kgrid(64*64). Could you please explain the meaning of sensor.directivity_pattern('pressure' and 'gradient')and sensor.directivity_size(16*kgrid.dx) more detailedly? I'd greatly appreciate your help.

   Thank you!

   Best,
   Fan

   Posted 7 years ago #

2. bencox
   

   Developer
   Joined: Mar '10
   Posts: 292

   Hi Fan,

   When using the 'pressure' option, the function applies a directional response that is equivalent to the directionality that would arise from spatial averaging over an element of that size, but it doesn't explicitly do the averaging. Instead, it applies the directionality in the wavenumber domain using an analytical expression. Similarly, setting the pattern to 'gradient' applies the figure-of-eight response characteristic of dipole detectors (ie. insensitive at grazing incidence).

   Hope that helps.
   Ben

   Posted 7 years ago #

3. ZHANG Fan
   

   Member
   Joined: Oct '16
   Posts: 9

   Hi Ben,

   Thank you for your reply!

   Best,
   Fan

   Posted 7 years ago #

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