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Heritage Science
Fig. 2 | Heritage Science

Fig. 2

From: Listening to laser light interactions with objects of art: a novel photoacoustic approach for diagnosis and monitoring of laser cleaning interventions

Fig. 2

PA imaging for the uncovering of hidden content in technical mock-ups consisting of documents. a Time-domain PA signals arising from four successive sheets. Dashed line corresponds to an exponential fitting of the maximum amplitude points (decay constant: 3.937 × 10–3 ns−1; R2 = 0.982), indicating a consistent signal decay as a function of sheet number. b Depth color-coded MAP PA reconstructions of a four-layered mock-up with non-overlapping text in top (XY) and side (XZ, YZ) views. Imaging depth is measured starting from the page facing the illumination side. Figure adapted from [45]

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