http://www.k-wave.org/forum/topic/how-does-sensor-works Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 01:46:02 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/how-does-sensor-works#post-6412 Thu, 12 Apr 2018 21:32:02 +0000 bencox 6412@http://www.k-wave.org/forum/ <p>Hi Dleeld,</p> <p>Try setting <code>source.p_mode = &#39;dirichlet&#39;</code>. That should sort out the amplitude errors. Have a look at this forum post too:<br /> <a href="http://www.k-wave.org/forum/topic/result-verification-against-green-function#post-4555" rel="nofollow">http://www.k-wave.org/forum/topic/result-verification-against-green-function#post-4555</a></p> <p>The early arrivals are due to the global nature of the functions (sinusoids) underlying the numerical method. You are seeing the 'bandlimited interpolant'. Have a look at this post:<br /> <a href="http://www.k-wave.org/forum/topic/what-is-the-cause-of-the-calculation-error-without-using-filtertimeseries#post-5080" rel="nofollow">http://www.k-wave.org/forum/topic/what-is-the-cause-of-the-calculation-error-without-using-filtertimeseries#post-5080</a></p> <p>Best wishes,<br /> Ben </p> http://www.k-wave.org/forum/topic/how-does-sensor-works#post-6342 Tue, 13 Mar 2018 22:29:08 +0000 Dleeld 6342@http://www.k-wave.org/forum/ <p>Hi,</p> <p>I have a problem on the work of sensors, I have create a time variating pressure source </p> <p>source.p = 30 * sin(2 * pi * source_freq * kgrid.t_array); </p> <p>The p_mask it's just a point in the center of the grid. And I try to record the variation of this source with two sensors put at the same x_axis of the source and one at y_source+1 and the second at y_source+100. </p> <p>I use sensor.record = {'p'}; to record the evolution of preassure </p> <p>But when I plot the result of the first sensor I obtain some time something totaly wrong , like a sinus curve but variating between 4 and -4, and some tine a sinus curve vevy between 25 and -25 but totaly with the wrong phase.</p> <p>And for the second sensor it's wrost becouse he recrod somethong even when the whave the wave did not reach it, and the sinus curve viry between something like 1*e-3 and -1*e-3.</p> <p>My grid is an 256*256 and teh space between point it's about 0.001 meter.</p> <p>What have I done wrong? </p> <p>Best regard </p>