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)

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 & Humanities > School of Culture and Creative Arts; College of Arts & Humanities > 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

Project Code	Award No	Project Name	Principal Investigator	Funder's Name	Funder Ref	Lead Dept
300866		PISTACHIO: Photonic Imaging Strategies for Technical Art Conservation and History	Christina Young	Engineering and Physical Sciences Research Council (EPSRC)	EP/R033013/1	Arts - History of Art