scholarly journals Nondestructive Evaluation of Apple Fruit Quality by Frequency-Domain Diffuse Reflectance Spectroscopy: Variations in Apple Skin and Flesh

2019 ◽  
Vol 9 (11) ◽  
pp. 2355 ◽  
Author(s):  
Nan-Yu Cheng ◽  
Chien-Chih Chen ◽  
Bo-Jian Liang ◽  
Sheng-Hao Tseng
Keyword(s):  
Optical Properties ◽  
Nondestructive Evaluation ◽  
Frequency Domain ◽  
Diffuse Reflectance ◽  
Diffuse Reflectance Spectroscopy ◽  
Biological Tissues ◽  
Reflectance Spectroscopy ◽  
Apple Fruit ◽  
Scattering Coefficients

The optical properties of fruits, such as light absorption and scattering characteristics, change with biochemical activities during storage. Diffuse reflectance spectroscopy (DRS) systems have been widely applied for noninvasively observing biological tissues. In this study, we used a frequency-domain DRS system to measure the optical properties of apples. Results showed that variations in the chlorophyll, water, and flesh-texture of apples could be noninvasively monitored over time. We also observed substantial differences in the absorption and reduced scattering coefficients between injured and normal apples. The DRS techniques could be used for apple grading, and, by extension, for monitoring the quality of other fruits.

DIFFUSE REFLECTANCE SPECTROSCOPY MONTE-CARLO MODELING: ELONGATED ARTERIAL TISSUES OPTICAL PROPERTIES

2006 ◽  
Vol 39 (18) ◽  
pp. 41-46
Author(s):  
Emilie Péry ◽  
Walter C.P.M. Blondel ◽  
Cédric Thomas ◽  
Jacques Didelon ◽  
François Guillemin
Keyword(s):  
Monte Carlo ◽  
Optical Properties ◽  
Diffuse Reflectance ◽  
Diffuse Reflectance Spectroscopy ◽  
Reflectance Spectroscopy ◽  
Monte Carlo Modeling

scholarly journals The Study of the Optical Properties of C60 Fullerene in Different Organic Solvents

2019 ◽  
Vol 17 (1) ◽  
pp. 1198-1212 ◽  
Author(s):  
Teguh Endah Saraswati ◽  
Umam Hasan Setiawan ◽  
Mohammad Rifki Ihsan ◽  
Isnaeni Isnaeni ◽  
Yuliati Herbani
Keyword(s):  
Optical Properties ◽  
Organic Solvents ◽  
Emission Band ◽  
Diffuse Reflectance ◽  
Diffuse Reflectance Spectroscopy ◽  
Reflectance Spectroscopy ◽  
C60 Fullerene ◽  
Absorbance Spectroscopy ◽  
Polar Organic Solvents ◽  
Optical Applications

AbstractC60 fullerene exhibits unique optical properties that have high potential for wide photo-optical applications. To analyze the optical properties of C60, its excitation and emission properties were studied using UV-Vis absorption and photoluminescence (PL) spectroscopy, which were performed in various, non-polar organic solvents such as toluene, xylene, and trichloroethylene (TCE). The C60 solutions in toluene, xylene, and TCE displayed similar excitation bands at 625, 591, 570, 535, and 404 nm corresponding to Ag → T1u and Ag → T1g transitions. However, these bands differed from the solid C60 observed by UV-Vis diffuse reflectance spectroscopy. The two emission band energies of C 60 solution in toluene and xylene were nearly the same (1.78 and 1.69 eV), whereas the C60 solution in TCE was shifted to 1.72 and 1.65 eV. Because the polarity of TCE is higher than that of toluene and xylene, the PL spectrum of the C 60 solution in TCE was red-shifted. The PL spectroscopy had a better capability than UV-Vis absorbance spectroscopy to distinguish the different interactions between C60 and the organic solvents due to their different solvent polarities.

Accessing deep optical properties of skin using diffuse reflectance spectroscopy

2015 ◽  
Author(s):  
Anne Koenig ◽  
Blandine Roig ◽  
Jimmy Le Digabel ◽  
Gwendal Josse ◽  
Jean-Marc Dinten
Keyword(s):  
Optical Properties ◽  
Diffuse Reflectance ◽  
Diffuse Reflectance Spectroscopy ◽  
Reflectance Spectroscopy

scholarly journals Optical properties of living corals determined with diffuse reflectance spectroscopy

2019 ◽  
Author(s):  
Steven L. Jacques ◽  
Daniel Wangpraseurt ◽  
Michael Kühl
Keyword(s):  
Optical Properties ◽  
Diffuse Reflectance ◽  
Fiber Optic ◽  
Diffuse Reflectance Spectroscopy ◽  
Light Exposure ◽  
Diffusion Theory ◽  
Reflectance Spectroscopy ◽  
Lateral Spread ◽  
Coral Tissue ◽  
Live Coral

AbstractThe internal light field and thus light exposure of the photosymbiotic microalgae (Symbiodinium sp.) in corals is strongly modulated by the optical properties of coral tissue and skeleton. While there are numerous studies documenting the light microenvironment in corals, there are only few measurements of the inherent optical properties of corals in the literature, and this has hampered a more quantitative understanding of coral optics. Here we present a study of the optical properties of 26 live coral samples, representative of 11 coral species and spanning a variety of morphotypes. We employed well-established fiber-optic reflectance spectroscopy techniques from biomedical optics using two methods: (1) A source and a detection fiber separated by a variable distance measured the lateral spread of light in corals, dominated by the skeleton; (2) A fiber-optic field radiance probe measured the diffuse reflectance from the coral surface, dominated by the living coral tissue. Analysis based on diffusion theory and Monte Carlo simulation yielded estimates of the bulk scattering and absorption coefficients of the coral tissue and skeleton, in the 750-1030 nm wavelength range. Extrapolating into the spectral region of photosynthetically active radiation (PAR, 400-700 nm) allowed estimation of the optical depth of absorption by the main Symbiodinium photopigment chlorophyll a. Coral tissue scattering was on average ~1.9x stronger than the scattering of the skeleton, consistent with the model that corals trap photons by high scattering to enhance absorption by algal pigments, while the lower scattering of the skeleton allows spread of light to otherwise shaded coral tissue areas.

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