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. 2021 Nov 18;11:22482. doi: 10.1038/s41598-021-01837-8

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© The Author(s) 2021

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Dual mode measurement setup in situ (left) and sketch of the recording system: (1) IR camera, (2) halogen sources for heating the painting, (3) non-heating TQR sources matched to the sensor, (4) control unit for TQR sources.