k-Wave

1. romy_budhi
   

   Member
   Joined: Jan '16
   Posts: 6

   Hi Dr.Brad, Dr. Cox, Dr.Jaros, and every one

   In k-Wave, can I measure/predict distance between source and sensor using the attenuation of intensity? My simulation under homogen media.
   Thank you.

   Posted 8 years ago #

2. Bradley Treeby
   

   Developer
   Joined: Mar '10
   Posts: 1,643

   Hi romy_budhi,

   If you know the attenuation coefficient and you have a plane wave (i.e., in 1D), then you can calculate the distance between source and sensor based on the attenuation using

   p_sensor / p_source = e^(-alpha*x)

   Here alpha is the attenuation coefficient in Nepers/m and p_source and p_sensor are the pressure amplitudes at the source and sensor. Similarly for intensity, where

   I_sensor / I_source = e^(-2*alpha*x)

   Hope that helps,

   Brad.

   Posted 8 years ago #

3. romy_budhi
   

   Member
   Joined: Jan '16
   Posts: 6

   Thanks Dr. Brad.
   I found difficult to implement those formula in 2D when I have the sensor which has directivity angle. I tried on the constant position between source and sensor, I rotated the angle of sensor and I found the variability of pressure intensity in the sensor. Anyway thanks. Finally I tried by calculate the time of flight times the speed of sound. Is there a better method? Thanks in advance.
   Regards,
   Romy

   Posted 8 years ago #

4. Bradley Treeby
   

   Developer
   Joined: Mar '10
   Posts: 1,643

   Hi Romy,

   In higher dimensions, I think it would be difficult to estimate distance based on attenuation. Using the sound speed and time-of-flight seems much more sensible!

   Brad.

   Posted 8 years ago #

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