Standoff Raman spectroscopy for architectural interiors from 3-15 m distances

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Li, Y, Cheung, C, Kogou, S ORCID: https://orcid.org/0000-0003-1722-7626, Liggins, F and Liang, H ORCID: https://orcid.org/0000-0001-9496-406X, 2019. Standoff Raman spectroscopy for architectural interiors from 3-15 m distances. Optics Express, 27 (22), pp. 31338-31347. ISSN 1094-4087

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Official URL: https://doi.org/10.1364/oe.27.031338

Abstract

Portable and mobile Raman spectroscopy systems are increasingly being adopted in in situ non-invasive examination of artworks given their high specificity in material identification. However, these systems typically operate within centimeter range working distances, making the examination of large architectural interiors such as wall paintings in churches challenging. We demonstrate the first standoff Raman spectroscopy system for in situ investigation of historic architectural interior at distances > 3 m. The 780 nm continuous wave laser-induced standoff Raman system was successfully deployed for the in situ examination of wall paintings, at distances of 3–15 m, under ambient light. It is able to identify most common pigments while maintaining a very low laser intensity to avoid light induced degradation. It is shown to complement our current method of standoff remote surveys of wall paintings using spectral imaging.

Item Type:	Journal article
Publication Title:	Optics Express
Creators:	Li, Y., Cheung, C., Kogou, S., Liggins, F. and Liang, H.
Publisher:	Optical Society of America
Date:	28 October 2019
Volume:	27
Number:	22
ISSN:	1094-4087
Identifiers:	Number Type 10.1364/oe.27.031338 DOI 1204930 Other
Rights:	Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License.
Divisions:	Schools > School of Science and Technology
Record created by:	Jonathan Gallacher
Date Added:	20 Nov 2019 14:17
Last Modified:	01 Feb 2022 16:27
URI:	https://irep.ntu.ac.uk/id/eprint/38399