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There’s more to reflectance spectroscopy than lux.

Beeby, Andrew and Garner, Louise and Howell, David and Nicholson, Catherine E. (2018) 'There’s more to reflectance spectroscopy than lux.', Journal of the Institute of Conservation., 41 (2). pp. 142-153.

Abstract

Fibre-optic reflectance spectroscopy is widely used as a tool for the analysis of coloured materials such as pigments and paints. We describe a new design for a FORS probe which is held some 5cm away from the sample surface and interrogates a spot of 2mm diameter, offering a significant advantage over existing methods. The spectrometer employs an illuminance of 1250lux, equivalent to 0.5mWcm−2 averaged across the visible spectrum. The spectral measurements take less than a second ensuring that the risk of sample photodegradation is minimal. Under these conditions there is no detectable temperature rise of the illuminated area. Increasing the illuminance above 25mWcm−2, a light level significantly higher than that required for our measurements, gave rise to significant localised temperature rises in model manuscripts. This demonstrates the need for caution when using this technique for the analysis of precious heritage items.

Item Type:Article
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1080/19455224.2018.1463920
Publisher statement:© 2018 The Authors. Published by Informa UK Limited, trading as Taylor & Francis Group This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Date accepted:09 April 2018
Date deposited:11 April 2018
Date of first online publication:08 May 2018
Date first made open access:No date available

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