http://www.k-wave.org/forum/topic/error-using-example_tvsp_transducer_field_patternsm Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 06:49:45 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/error-using-example_tvsp_transducer_field_patternsm#post-4914 Mon, 22 Dec 2014 13:44:03 +0000 Bradley Treeby 4914@http://www.k-wave.org/forum/ <p>Hi Hermes,</p> <p>The performance of the PML at normal incidence is a reduction in the pressure amplitude of somewhere between 60 and 80 dB (independent of the initial pressure). This corresponds to three or four decimal places of accuracy. If your source magnitude is of the order 10^6, and your plot scale is set to the default (-1 to 1), then you will undoubtedly see different behaviour, including wave wrapping and the underlying behaviour of the <a href="http://www.k-wave.org/documentation/example_na_source_smoothing.php">band-limited interpolant</a>.</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/error-using-example_tvsp_transducer_field_patternsm#post-4911 Fri, 19 Dec 2014 18:10:05 +0000 hkamimura 4911@http://www.k-wave.org/forum/ <p>Without rescaling the example it's also possible to see the wave formation from the sides. Is it a PML setting that need to be changed depending on the source magnitude?</p> <p><a href="https://drive.google.com/file/d/0B2glsz_fmxT0MV9vendnM0dCM1k/view?usp=sharing" rel="nofollow">https://drive.google.com/file/d/0B2glsz_fmxT0MV9vendnM0dCM1k/view?usp=sharing</a></p> <p>Thanks,<br /> Hermes </p> http://www.k-wave.org/forum/topic/error-using-example_tvsp_transducer_field_patternsm#post-4910 Fri, 19 Dec 2014 17:22:45 +0000 hkamimura 4910@http://www.k-wave.org/forum/ <p>Hi Dr. Treeby,</p> <p>Thanks for the prompt answer.<br /> I am simulating the standing wave formation in structures defined by CT images. I was wondering if the artifact seen in the image in the link below is only a scale problem or if it's something else. In the image you can see the formation of waves in the bottom before the wavefront reaches it. My source is similar to the referred example.</p> <p><a href="https://drive.google.com/file/d/0B2glsz_fmxT0Rk81SUZ5ODNMc2M/view?usp=sharing" rel="nofollow">https://drive.google.com/file/d/0B2glsz_fmxT0Rk81SUZ5ODNMc2M/view?usp=sharing</a></p> <p>Thanks,<br /> Hermes </p> http://www.k-wave.org/forum/topic/error-using-example_tvsp_transducer_field_patternsm#post-4909 Fri, 19 Dec 2014 09:40:02 +0000 Bradley Treeby 4909@http://www.k-wave.org/forum/ <p>Hi Hermes,</p> <p>What do you mean by crashes? Is it just a plot scaling issue? What happens if you add:</p> <p><code>&#39;PlotScale&#39;, [-1, 1]*source_mag</code> </p> <p>to the list of input options?</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/error-using-example_tvsp_transducer_field_patternsm#post-4907 Thu, 18 Dec 2014 21:58:37 +0000 hkamimura 4907@http://www.k-wave.org/forum/ <p>Hi,</p> <p>Could you help me figuring out why k-wave crashes when defining high values (e.g. 1e6 Pa) of the source pressure for arbitrary sources such as in the example "example_tvsp_transducer_field_patterns.m"? </p> <p>Thanks,<br /> Hermes </p>