Figure 6From: Application of the topological derivative to post-processing infrared time-harmonic thermograms for defect detectionThermograms with \(\omega =2\mbox{ Hz}\). Left: amplitude of the temperature \(|\mathcal{T}^{\mathrm{front}}|\). Right: difference between thermograms corresponding to a healthy plate and a faulty one. At high frequencies the box defect, which is the shallower one, is barely visibleBack to article page