Figure 7From: Application of the topological derivative to post-processing infrared time-harmonic thermograms for defect detectionValues of the topological derivative on several planes of the form \(x=x_{0}\). First: \(x=-\ell _{x}/2\). Second: \(x=-\ell _{x}/4\). Third: \(x=0\). Forth: \(x=\ell _{x}/4\)Back to article page