Veuillez utiliser cette adresse pour citer ce document : https://hdl.handle.net/10953/3313
Titre: Comparing mapping and direct hyperspectral imaging in stand-off Raman spectroscopy for remote material identification
Auteur(s): Gasser, Christoph
González-Cabrera, María
Ayora-Cañada, María José
Domínguez-Vidal, Ana
Lendl, Bernhard
Résumé: Stand-off Raman spectroscopy offers a highly selective technique to probe unknown substances from a safe distance. Often, it is necessary to scan large areas of interest. This can be done by pointwise imaging (PI), that is, spectra are sequentially acquired from an array of points over the region of interest (point-by-point mapping). Alternatively, in this paper a direct hyperspectral Raman imager is presented, where a defocused laser beam illuminates a wide area of the sample and the Raman scattered light is collected from the whole field of view (FOV) at once as a spectral snapshot filtered by a liquid crystal tunable filter to select a specific Raman shift. Both techniques are compared in terms of achievable FOV, spectral resolution, signal-to-noise performance, and time consumption during a measurement at stand-off distance of 15 m. The HSRI showed superior spectral resolution and signal-to-noise ratio, while more than doubling the FOV of the PI at laser power densities reduced by a factor of 277 at the target. Further, the output hyperspectral image data cube can be processed with state of the art chemometric algorithms like vertex component analysis in order to get a simple deterministic false color image showing the chemical composition of the target. This is shown for an artificial polymer sample, measured at a distance of 15 m.
Mots-clés: stand‐off
remote detection
Raman spectroscopy
hyperspectral imaging
Date de publication: 2019
metadata.dc.description.sponsorship: Ministry of Education, Culture and Sports, Grant/Award Number: FPU15/03119; Austrian Science Fund, Grant/Award Number: TRP265‐N20
Editeur: Wiley
Référence bibliographique: Journal of Raman Spectroscocopy 2019; 50:1034–1043
Collection(s) :DQFA-Artículos

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