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Figure 13 | Journal of Mathematics in Industry

Figure 13

From: Application of the topological derivative to post-processing infrared time-harmonic thermograms for defect detection

Figure 13

Topological derivative on \(\varGamma _{\mathrm{front}}\) combining several frequencies and lamp locations. Left: topological derivative corresponding to six linearly spaced frequencies between 0.2 and 2 Hz and a 2-by-2 grid of lamps. Right: counterpart when a 3-by-3 grid of lamps is used. The appearance of spurious minima is highly reduced in both cases due to the multifrequency character, and increasing the number of lamps highly improves the reconstructions

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