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Figure 10 | Journal of Mathematics in Industry

Figure 10

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

Figure 10

Topological derivative on \(\varGamma _{\mathrm{front}}\) for ten combined frequencies. Left: topological derivative combining ten linearly-spaced frequencies between 0.8 and 2 Hz. Right: zoom of the previous image around the groove-shaped defect with the colormap rescaled to the visible range. The outline of the defect is also shown in black on the image on the right

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