k-Wave

1. shanchengbao09@tamu.edu
   

   Member
   Joined: Jan '21
   Posts: 4

   I am a rookie in K-Wave. Pretty confused by the definition and formula of wavenumber component vector:
   To my understand, wavenumber is defined as the number of radians per unit distance: 2*pi/WaveLength. However, in the kWaveGrid.m, kx_vec = (2*pi/dx) .* nx, where dx is the grid size, nx is an array from -0.5 to +0.5. How is the output kx_vec relate to the number of radians per unit distance?

   Appreciate if anyone can provide a general explanation to this point or provide some reading materials. Thanks so much

   Posted 2 years ago #

2. Bradley Treeby
   

   Developer
   Joined: Mar '10
   Posts: 1,643

   Imagine taking a signal containing a sine wave with single spatial frequency (wavenumber). If you take a Fourier transform of the signal, you will see a peak at the frequency of the sine wave. The wavenumber vector you describe essentially specifies the frequency axis of the Fourier transform. The actual wavenumbers present will depend on the waves present in the signal.

   Hope that helps,

   Brad.

   Posted 2 years ago #

3. shanchengbao09@tamu.edu
   

   Member
   Joined: Jan '21
   Posts: 4

   Thanks so much. I think I understand it now

   Posted 2 years ago #

4. chiragjin
   

   Member
   Joined: Dec '21
   Posts: 3

   I am also a beginner in this space and came across the following youtube video some days back. It provides a practical feel of how wavenumber works. Hope it helps.

   https://www.youtube.com/watch?v=02J_j6SWH_M&list=PLUoFce-1LZKqaSpFtHUSaGYBebmEmitFj&index=7&ab_channel=BE280A

   Chirag

   Posted 2 years ago #

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