Near-infrared spectroscopy combined with principal components analysis and a back propagation neural network identified Huanglongbing-infected Gannan navel orange leaves with an overall accuracy of 98.75%, outperforming LDA, KNN, and SVM models.
|Articles|March 18, 2016
Edinburgh Instruments’ Spectrometers Used to Characterize Egyptian Blue Pigment
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The Edinburgh Instruments applications team and Gianluca Accorsi, a research fellow at CNR Nanotec in Lecce, Italy, worked on the photo-physical properties of Egyptian blue pigment using Edinburgh’s fluorescence spectrometers.
The Edinburgh Instruments applications team and Gianluca Accorsi, a research fellow at CNR Nanotec in Lecce, Italy, worked on the photo-physical properties of Egyptian blue pigment using Edinburgh’s fluorescence spectrometers.
Interest in non-invasive investigations for the study and identification of painting materials has greatly increased during the past two decades. The nature of museum objects is such that sampling is always kept to a minimum; thus, a spectroscopic approach is ideal for this purpose.
An ancient pigment, cuprorivaite, CaCuSi4O10 or otherwise called Egyptian blue, has been photo-physically investigated.
The investigation includes qualitative information, for example, emission and excitation spectra, as well as quantitative that are the photoluminescence quantum yields (PLQY) that have been obtained in the near-infrared (NIR) region.
The pigment proved to be a strong NIR emitter, with the highest known quantum efficiency for a molecule-level chromophore.
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