Compressive hyperspectral imaging in the molecular fingerprint band

Charsley, J.M., Rutkauskas, M., Altmann, Y., Risdonne, V., Botticelli, M. , Smith, M.J., Young, C.R.T. and Reid, D.T. (2022) Compressive hyperspectral imaging in the molecular fingerprint band. Optics Express, 30(10), pp. 17340-17350. (doi: 10.1364/OE.451380)

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Abstract

Spectrally-resolved imaging provides a spectrum for each pixel of an image that, in the mid-infrared, can enable its chemical composition to be mapped by exploiting the correlation between spectroscopic features and specific molecular groups. The compatibility of Fourier-transform interferometry with full-field imaging makes it the spectroscopic method of choice, but Nyquist-limited fringe sampling restricts the increments of the interferometer arm length to no more than a few microns, making the acquisition time-consuming. Here, we demonstrate a compressive hyperspectral imaging strategy that combines non-uniform sampling and a smoothness-promoting prior to acquire data at 15% of the Nyquist rate, providing a significant acquisition-rate improvement over state-of-the-art techniques. By illuminating test objects with a sequence of suitably designed light spectra, we demonstrate compressive hyperspectral imaging across the 700–1400 cm-1 region in transmission mode. A post-processing analysis of the resulting hyperspectral images shows the potential of the method for efficient non-destructive classification of different materials on painted cultural heritage.

Item Type:Articles
Additional Information:Funding: Royal Academy of Engineering (RF201617/16/31); Engineering and Physical Sciences Research Council (EP/R033013/1).
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Risdonne, Ms Valentina and Botticelli, Dr Michela and Young, Professor Christina
Authors: Charsley, J.M., Rutkauskas, M., Altmann, Y., Risdonne, V., Botticelli, M., Smith, M.J., Young, C.R.T., and Reid, D.T.
College/School:College of Arts > School of Culture and Creative Arts
College of Arts > School of Culture and Creative Arts > History of Art
Journal Name:Optics Express
Publisher:Optical Society of America
ISSN:1094-4087
ISSN (Online):1094-4087
Published Online:05 May 2022
Copyright Holders:Copyright © 2022 Optics Express
First Published:First published in Optics Express 30(10):17340-17350
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
300866PISTACHIO: Photonic Imaging Strategies for Technical Art Conservation and HistoryChristina YoungEngineering and Physical Sciences Research Council (EPSRC)EP/R033013/1Arts - History of Art