Time and spatially resolved VIS-NIR hyperspectral imaging as a novel monitoring tool for laser-based spectroscopy to mitigate radiation damage on paintings

Suzuki, A ORCID: https://orcid.org/0000-0002-1517-0614, Cheung, CS, Li, Y, Hogg, A, Atkinson, PS ORCID: https://orcid.org/0000-0002-2398-8424, Riminesi, C, Miliani, C and Liang, H ORCID: https://orcid.org/0000-0001-9496-406X, 2024. Time and spatially resolved VIS-NIR hyperspectral imaging as a novel monitoring tool for laser-based spectroscopy to mitigate radiation damage on paintings. The Analyst, 149 (8), pp. 2338-2350. ISSN 0003-2654

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Abstract

The increased adoption of non-invasive laser-based techniques for analysis of cultural assets has recently called into question the non-invasiveness of the techniques in practical operation. The methods to assess the occurrence of radiation-induced alteration on paintings are very limited and none of them can predict damage. Here we present a novel multimodal imaging approach to understand the time and spatial evolution and types of laser-induced surface alterations, through simultaneous monitoring using visible and near infrared (VIS-NIR) reflectance hyperspectral imaging (HSI) and thermal imaging during Raman spectroscopy. The resultant physical and chemical changes were examined in detail by optical coherence tomography and synchrotron based micro-X-ray powder diffraction. HSI was found to be the most sensitive in detecting laser induced alternations compared with conventional methods. It is orders of magnitude more sensitive than Raman spectroscopy and even synchrotron-based micro-X-ray powder diffraction. In cases of thermally driven alterations, transient and reversible reflectance changes were found to be the first indications of laser-induced modifications and can therefore be used as precursors to prevent damage. VIS-NIR reflectance spectroscopy should be used to monitor laser-based analysis and potentially other radiation-based techniques in situ to mitigate laser induced alteration.

Item Type:	Journal article
Publication Title:	The Analyst
Creators:	Suzuki, A., Cheung, C.S., Li, Y., Hogg, A., Atkinson, P.S., Riminesi, C., Miliani, C. and Liang, H.
Publisher:	Royal Society of Chemistry (RSC)
Date:	29 January 2024
Volume:	149
Number:	8
ISSN:	0003-2654
Identifiers:	Number Type 10.1039/d3an02041j DOI 1872839 Other
Divisions:	Schools > School of Science and Technology
Record created by:	Jeremy Silvester
Date Added:	30 May 2024 15:46
Last Modified:	30 May 2024 15:46
URI:	https://irep.ntu.ac.uk/id/eprint/51494

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