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Figure 9 | Journal of Mathematics in Industry

Figure 9

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

Figure 9

Topological derivative on \(\varGamma _{\mathrm{front}}\) for two combined frequencies. Left: topological derivative combining single-frequency data at 0.8 and 2 Hz. Right: zoom of the previous image around the box-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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