http://www.k-wave.org/forum/topic/attenuation-function Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 01:06:25 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/attenuation-function#post-5447 Mon, 04 Apr 2016 21:14:29 +0000 Bradley Treeby 5447@http://www.k-wave.org/forum/ <p>Hi Romy,</p> <p>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!</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/attenuation-function#post-5436 Tue, 22 Mar 2016 09:27:40 +0000 romy_budhi 5436@http://www.k-wave.org/forum/ <p>Thanks Dr. Brad.<br /> 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.<br /> Regards,<br /> Romy </p> http://www.k-wave.org/forum/topic/attenuation-function#post-5428 Thu, 17 Mar 2016 14:54:22 +0000 Bradley Treeby 5428@http://www.k-wave.org/forum/ <p>Hi romy_budhi,</p> <p>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> <p>p_sensor / p_source = e^(-alpha*x)</p> <p>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</p> <p>I_sensor / I_source = e^(-2*alpha*x)</p> <p>Hope that helps,</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/attenuation-function#post-5413 Thu, 10 Mar 2016 10:03:10 +0000 romy_budhi 5413@http://www.k-wave.org/forum/ <p>Hi Dr.Brad, Dr. Cox, Dr.Jaros, and every one</p> <p>In k-Wave, can I measure/predict distance between source and sensor using the attenuation of intensity? My simulation under homogen media.<br /> Thank you. </p>