scholarly journals A Preliminary Study on the Differentiation of Linseed and Poppy Oil Using Principal Component Analysis Methods Applied to Fiber Optics Reflectance Spectroscopy and Diffuse Reflectance Imaging Spectroscopy

Sensors ◽  
2020 ◽  
Vol 20 (24) ◽  
pp. 7125
Author(s):  
Silvia Rita Amato ◽  
Aviva Burnstock ◽  
Anne Michelin
Keyword(s):  
Diffuse Reflectance ◽  
Linseed Oil ◽  
Imaging Spectroscopy ◽  
Reflectance Spectroscopy ◽  
Organic Analysis ◽  
Invasive Approach ◽  
Drying Oils ◽  
Non Invasive ◽  
Reflectance Imaging Spectroscopy ◽  
Diffuse Reflectance Imaging

This paper presents results from the examination of a set of experimental samples using fibre optic reflectance spectroscopy (FORS) and diffuse reflectance imaging spectroscopy in the short-wave infrared (SWIR) range, combined with statistical analysis of the data for the discrimination and mapping of poppy and linseed oil. The aim was to evaluate the efficacy of this non-invasive approach for the study of paint samples with a view to the application of the method for characterisation of the two drying oils in painted art. The approach allowed discrimination between the two drying oils based on FORS spectra and the hyperspectral cube, indicating the influence of the spectral region around 1700 nm on the statistical discrimination based on the anti-symmetric and symmetric first overtone stretching of methylenic CH2 groups. This method is being studied as a potential non-invasive method of organic analysis of oil types that have formerly been studied using gas chromatography-mass spectrometry (GC-MS), which requires micro-samples.

Standoff chemical imaging finds evidence for Jackson Pollock's selective use of alkyd and oil binding media in a famous ‘drip’ painting

2017 ◽  
Vol 9 (1) ◽  
pp. 28-37 ◽  
Author(s):  
Kathryn A. Dooley ◽  
James Coddington ◽  
Jay Krueger ◽  
Damon M. Conover ◽  
Murray Loew ◽  
...  
Keyword(s):  
Diffuse Reflectance ◽  
Near Infrared ◽  
Imaging Spectroscopy ◽  
Chemical Imaging ◽  
Binding Media ◽  
Reflectance Imaging Spectroscopy ◽  
Oil Paints ◽  
Diffuse Reflectance Imaging ◽  
Oil Binding

Near-infrared diffuse reflectance imaging spectroscopy (NIR-RIS, 1000 to 2500 nm) was used to map the use of alkyd and oil paints in Jackson Pollock'sNumber 1, 1950(Lavender Mist), one of his most important ‘drip’ or ‘poured’ paintings.

scholarly journals Towards shifted position-diffuse reflectance imaging of anatomically correctly scaled human microvasculature

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Moritz Späth ◽  
Martin Hohmann ◽  
Clemens Roider ◽  
Benjamin Lengenfelder ◽  
Florian Stelzle ◽  
...  
Keyword(s):  
Diffuse Reflectance ◽  
Optical Methods ◽  
Reference Image ◽  
Core Diameter ◽  
Non Invasive ◽  
Evaluation Algorithm ◽  
Examination Methods ◽  
Illumination Wavelength ◽  
Diffuse Reflectance Imaging ◽  
Reflectance Data

Abstract Due to significant advantages, the trend in the field of medical technology is moving towards minimally or even non-invasive examination methods. In this respect, optical methods offer inherent benefits, as does diffuse reflectance imaging (DRI). The present study attempts to prove the suitability of DRI—when implemented alongside a suitable setup and data evaluation algorithm—to derive information from anatomically correctly scaled human capillaries (diameter: $$10\,\upmu \hbox {m}$$ 10 μ m , length: $$45\,\upmu \hbox {m}$$ 45 μ m ) by conducting extensive Monte–Carlo simulations and by verifying the findings through laboratory experiments. As a result, the method of shifted position-diffuse reflectance imaging (SP-DRI) is established by which average signal modulations of up to 5% could be generated with an illumination wavelength of $$\lambda =424\,\hbox {nm}$$ λ = 424 nm and a core diameter of the illumination fiber of $$50\,\upmu \hbox {m}$$ 50 μ m . No reference image is needed for this technique. The present study reveals that the diffuse reflectance data in combination with the SP-DRI normalization are suitable to localize human capillaries within turbid media.

Non-invasive detection of periodontal disease using diffuse reflectance spectroscopy: a clinical study

2012 ◽  
Author(s):  
Chandra Sekhar Prasanth ◽  
Joseph Betsy ◽  
Narayanan Subhash ◽  
Jayaraj L. Jayanthi ◽  
Janam Prasanthila
Keyword(s):  
Clinical Study ◽  
Periodontal Disease ◽  
Diffuse Reflectance ◽  
Diffuse Reflectance Spectroscopy ◽  
Reflectance Spectroscopy ◽  
Non Invasive

scholarly journals Assessing Laser Cleaning of a Limestone Monument by Fiber Optics Reflectance Spectroscopy (FORS) and Visible and Near-Infrared (VNIR) Hyperspectral Imaging (HSI)

Minerals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1052
Author(s):  
Costanza Cucci ◽  
Olga De Pascale ◽  
Giorgio S. Senesi
Keyword(s):  
Fiber Optics ◽  
Hyperspectral Imaging ◽  
Near Infrared ◽  
Conservation Status ◽  
Spectral Characteristics ◽  
Imaging Spectroscopy ◽  
Reflectance Spectroscopy ◽  
Laser Cleaning ◽  
Cleaning Process ◽  
Invasive Approach

Fiber optics reflectance spectroscopy (FORS) and visible and near-infrared (VNIR) hyperspectral imaging (HSI) were applied to assess and control the laser cleaning process of a deeply darkened limestone surface collected from the historic entrance gate of Castello Svevo, Bari, Italy. Both techniques enabled us to verify the different degree of removal of a thick deposit of black crust from the surface of the walls. Results obtained were in good agreement with those of previous studies of the elemental composition achieved by application of laser-induced breakdown spectroscopy (LIBS). Coupling FORS and VNIR-HSI provided important information on the optimal conditions to evaluate the conservation status and determine the more appropriate level of cleaning restoration, thus avoiding over- and/or under-cleaning. Imaging spectroscopy was used to obtain maps of areas featuring the same or different spectral characteristics, so to achieve a sufficient removal of unwanted layers, without modifying the surface underneath, and to increase the efficiency of traditional cleaning techniques. The performance of the combined non-invasive approach used in this work shows promise for further applications to other types of rocks and highlights the potential for in situ assessment of the laser cleaning process based on reflectance spectroscopy.

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