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Kapcsolat
A Simplified Two Layer Model for Light Diffuse Reflectance in Thin Skin Fruits |
Tartalom: | http://real.mtak.hu/56154/ |
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Archívum: | MTA Könyvtár |
Gyűjtemény: |
Status = Published
Type = Article |
Cím: |
A Simplified Two Layer Model for Light Diffuse Reflectance in Thin Skin Fruits
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Létrehozó: |
BrĂĄzio, AntĂłnio
Cavaco, Ana Margarida
Guerra, Rui
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Kiadó: |
AkadĂŠmiai KiadĂł
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Dátum: |
2010
info:eu-repo/date/embargoEnd/2030-12-31
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Téma: |
S1 Agriculture (General) / mezĹgazdasĂĄg ĂĄltalĂĄban
TA Engineering (General). Civil engineering (General) / ĂĄltalĂĄnos mĂŠrnĂśki tudomĂĄnyok
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Tartalmi leírás: |
A simple model of light diffuse reflectance in thin skin fruits is presented. The model is based in a semi-infinite two-layer geometry (skin and flesh) and introduces simplifications due to the fact that the first layer is very thin. The flesh is described in terms of the usual reduced scattering and absorption coefficients ÂľsⲠand Âľa but the skin is modeled by simple reflection (R), absorption (A) and transmission (T) coefficients. The problem of diffuse reflectance is thus reduced to the problem of determining the four constants Âľsâ˛, Âľa, R and T. It is shown that the problem can be solved by using absolute reflectance and spatially resolved reflectance measurements simultaneously. The coefficients ÂľsⲠand Âľa are determined by the usual fit of the diffuse reflectance profile (photons re-emitted from the flesh far from the incidence point) to the diffusion approximation. The coefficients R and T are determined by a second fit involving the total reflectance profile (photons reemitted both from skin and flesh), the incident beam profile and the diffuse reflectance profile calculated according to the previously determined values of ÂľsⲠand Âľa. The anisotropy of the light re-emitted by the fruit can also be roughly compared with the Lambertian expected behavior. In order to test the model we have followed a population of 22 âRochaâ pears along a period of two weeks. We have then performed the population averages along the time and checked the plausibility of the values obtained for Âľsâ˛, Âľa, R and T according to the expected fruit physiological changes along ripening. The results show that all parameters are physically acceptable and evolve in time according to the expected fruit ripening physiology.
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Nyelv: |
magyar
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Típus: |
Article
PeerReviewed
info:eu-repo/semantics/article
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Formátum: |
text
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Azonosító: |
BrĂĄzio, AntĂłnio and Cavaco, Ana Margarida and Guerra, Rui (2010) A Simplified Two Layer Model for Light Diffuse Reflectance in Thin Skin Fruits. Progress in Agricultural Engineering Sciences, 6 (1). pp. 35-72. ISSN 1786-335X
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Kapcsolat: |
https://doi.org/10.1556/Progress.6.2010.3
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Létrehozó: |
info:eu-repo/semantics/embargoedAccess
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