The Experts below are selected from a list of 183 Experts worldwide ranked by ideXlab platform
J P Gastelluetchegorry - One of the best experts on this subject based on the ideXlab platform.
-
the stochastic beer lambert Bouguer Law for discontinuous vegetation canopies
Journal of Quantitative Spectroscopy & Radiative Transfer, 2018Co-Authors: N Shabanov, J P GastelluetchegorryAbstract:Abstract The 3D distribution of canopy foliage affects the radiation regime and retrievals of canopy biophysical parameters. The gap fraction is one primary indicator of a canopy structure. Historically the Beer–Lambert–Bouguer Law and the linear mixture model have served as a basis for multiple technologies for retrievals of the gap (or vegetation) fraction and Leaf Area Index (LAI). The Beer–Lambert–Bouguer Law is a form of the Radiative Transfer (RT) equation for homogeneous canopies, which was later adjusted for a correlation between fitoelements using concept of the clumping index. The Stochastic Radiative Transfer (SRT) approach has been developed specifically for heterogeneous canopies, however the approach lacks a proper model of the vegetation fraction. This study is focused on the implementation of the stochastic version of the Beer–Lambert–Bouguer Law for heterogeneous canopies, featuring the following principles: 1) two mechanisms perform photon transport- transmission through the turbid medium of foliage crowns and direct streaming through canopy gaps, 2) the radiation field is influenced by a canopy structure (quantified by the statistical moments of a canopy structure) and a foliage density (quantified by the gap fraction as a function of LAI), 3) the notions of canopy transmittance and gap fraction are distinct. The derived stochastic Beer–Lambert–Bouguer Law is consistent with the Geometrical Optical and Radiative Transfer (GORT) derivations. Analytical and numerical analysis of the stochastic Beer–Lambert–Bouguer Law presented in this study provides the basis to reformulate widely used technologies for retrievals of the gap fraction and LAI from ground and satellite radiation measurements.
Martijn C De Sterke - One of the best experts on this subject based on the ideXlab platform.
-
effective photons in weakly absorptive dielectric media and the beer lambert Bouguer Law
New Journal of Physics, 2014Co-Authors: Alexander C Judge, J S Brownless, N A R Bhat, J E Sipe, M J Steel, Martijn C De SterkeAbstract:We derive effective photon modes that facilitate an intuitive and convenient picture of photon dynamics in a structured Kramers–Kronig dielectric in the limit of weak absorption. Each mode is associated with a mode field distribution that includes the effects of both material and structural dispersion, and an effective line-width that determines the temporal decay rate of the photon. These results are then applied to obtain an expression for the Beer–Lambert–Bouguer Law absorption coefficient for unidirectional propagation in structured media consisting of dispersive, weakly absorptive dielectric materials.
-
effective photons in weakly absorptive dielectric media and the beer lambert Bouguer Law
arXiv: Optics, 2013Co-Authors: Alexander C Judge, J S Brownless, N A R Bhat, J E Sipe, M J Steel, Martijn C De SterkeAbstract:We derive effective photon modes that facilitate an intuitive and convenient picture of photon dynamics in a structured Kramers-Kronig dielectric in the limit of weak absorption. Each mode is associated with an effective line-width which determines the temporal decay rate of the photon. These results are then applied to obtain an expression for the Beer-Lambert-Bouguer Law absorption coefficient for unidirectional propagation in structured media consisting of dispersive, weakly absorptive dielectric materials.
N Shabanov - One of the best experts on this subject based on the ideXlab platform.
-
the stochastic beer lambert Bouguer Law for discontinuous vegetation canopies
Journal of Quantitative Spectroscopy & Radiative Transfer, 2018Co-Authors: N Shabanov, J P GastelluetchegorryAbstract:Abstract The 3D distribution of canopy foliage affects the radiation regime and retrievals of canopy biophysical parameters. The gap fraction is one primary indicator of a canopy structure. Historically the Beer–Lambert–Bouguer Law and the linear mixture model have served as a basis for multiple technologies for retrievals of the gap (or vegetation) fraction and Leaf Area Index (LAI). The Beer–Lambert–Bouguer Law is a form of the Radiative Transfer (RT) equation for homogeneous canopies, which was later adjusted for a correlation between fitoelements using concept of the clumping index. The Stochastic Radiative Transfer (SRT) approach has been developed specifically for heterogeneous canopies, however the approach lacks a proper model of the vegetation fraction. This study is focused on the implementation of the stochastic version of the Beer–Lambert–Bouguer Law for heterogeneous canopies, featuring the following principles: 1) two mechanisms perform photon transport- transmission through the turbid medium of foliage crowns and direct streaming through canopy gaps, 2) the radiation field is influenced by a canopy structure (quantified by the statistical moments of a canopy structure) and a foliage density (quantified by the gap fraction as a function of LAI), 3) the notions of canopy transmittance and gap fraction are distinct. The derived stochastic Beer–Lambert–Bouguer Law is consistent with the Geometrical Optical and Radiative Transfer (GORT) derivations. Analytical and numerical analysis of the stochastic Beer–Lambert–Bouguer Law presented in this study provides the basis to reformulate widely used technologies for retrievals of the gap fraction and LAI from ground and satellite radiation measurements.
-
The stochastic Beer–Lambert–Bouguer Law for discontinuous vegetation canopies
Journal of Quantitative Spectroscopy & Radiative Transfer, 2018Co-Authors: N Shabanov, Jean-philippe Gastellu-etchegorryAbstract:Abstract The 3D distribution of canopy foliage affects the radiation regime and retrievals of canopy biophysical parameters. The gap fraction is one primary indicator of a canopy structure. Historically the Beer–Lambert–Bouguer Law and the linear mixture model have served as a basis for multiple technologies for retrievals of the gap (or vegetation) fraction and Leaf Area Index (LAI). The Beer–Lambert–Bouguer Law is a form of the Radiative Transfer (RT) equation for homogeneous canopies, which was later adjusted for a correlation between fitoelements using concept of the clumping index. The Stochastic Radiative Transfer (SRT) approach has been developed specifically for heterogeneous canopies, however the approach lacks a proper model of the vegetation fraction. This study is focused on the implementation of the stochastic version of the Beer–Lambert–Bouguer Law for heterogeneous canopies, featuring the following principles: 1) two mechanisms perform photon transport- transmission through the turbid medium of foliage crowns and direct streaming through canopy gaps, 2) the radiation field is influenced by a canopy structure (quantified by the statistical moments of a canopy structure) and a foliage density (quantified by the gap fraction as a function of LAI), 3) the notions of canopy transmittance and gap fraction are distinct. The derived stochastic Beer–Lambert–Bouguer Law is consistent with the Geometrical Optical and Radiative Transfer (GORT) derivations. Analytical and numerical analysis of the stochastic Beer–Lambert–Bouguer Law presented in this study provides the basis to reformulate widely used technologies for retrievals of the gap fraction and LAI from ground and satellite radiation measurements.
Alexander C Judge - One of the best experts on this subject based on the ideXlab platform.
-
Effective photons in weakly absorptive dielectric media and the Beer–Lambert–Bouguer Law
New Journal of Physics, 2014Co-Authors: Alexander C Judge, J S Brownless, N A R Bhat, J E Sipe, M J Steel, C. Martijn De SterkeAbstract:We derive effective photon modes that facilitate an intuitive and convenient picture of photon dynamics in a structured Kramers–Kronig dielectric in the limit of weak absorption. Each mode is associated with a mode field distribution that includes the effects of both material and structural dispersion, and an effective line-width that determines the temporal decay rate of the photon. These results are then applied to obtain an expression for the Beer–Lambert–Bouguer Law absorption coefficient for unidirectional propagation in structured media consisting of dispersive, weakly absorptive dielectric materials.
-
effective photons in weakly absorptive dielectric media and the beer lambert Bouguer Law
New Journal of Physics, 2014Co-Authors: Alexander C Judge, J S Brownless, N A R Bhat, J E Sipe, M J Steel, Martijn C De SterkeAbstract:We derive effective photon modes that facilitate an intuitive and convenient picture of photon dynamics in a structured Kramers–Kronig dielectric in the limit of weak absorption. Each mode is associated with a mode field distribution that includes the effects of both material and structural dispersion, and an effective line-width that determines the temporal decay rate of the photon. These results are then applied to obtain an expression for the Beer–Lambert–Bouguer Law absorption coefficient for unidirectional propagation in structured media consisting of dispersive, weakly absorptive dielectric materials.
-
effective photons in weakly absorptive dielectric media and the beer lambert Bouguer Law
arXiv: Optics, 2013Co-Authors: Alexander C Judge, J S Brownless, N A R Bhat, J E Sipe, M J Steel, Martijn C De SterkeAbstract:We derive effective photon modes that facilitate an intuitive and convenient picture of photon dynamics in a structured Kramers-Kronig dielectric in the limit of weak absorption. Each mode is associated with an effective line-width which determines the temporal decay rate of the photon. These results are then applied to obtain an expression for the Beer-Lambert-Bouguer Law absorption coefficient for unidirectional propagation in structured media consisting of dispersive, weakly absorptive dielectric materials.
D. Longo - One of the best experts on this subject based on the ideXlab platform.
-
SO 2 Monitoring With Solid State-Based UV Spectroscopy Compact Apparatus
IEEE Sensors Journal, 2019Co-Authors: G. Giudice, A. Sciuto, A. Meli, G. D'arrigo, D. LongoAbstract:We propose a solid state-based spectroscopy compact apparatus for monitoring environmental SO2, particularly suitable, for example, for volcanic applications. A prototype system, with a 170-mm long optical path, was assembled and tested using a commercial LED operating at 285 nm and a large area silicon carbide. The laboratory tests were carried out using calibrated quartz cuvettes containing SO2 at fixed concentrations and standard SO2 gas with 20% of O2 and complemented with N2 dry gas to fill the optical system chamber. Optical signal attenuations in the chemically interactive chamber follow the Beer-Lambert-Bouguer Law in all the performed tests and a 0.16 ppm/pA nominal chemical resolution and ± 0.8 ppm concentration error were obtained from the experimental data for the current prototype.
-
SO2 Monitoring With Solid State-Based UV Spectroscopy Compact Apparatus
IEEE Sensors Journal, 2019Co-Authors: G. Giudice, A. Sciuto, A. Meli, G. D’arrigo, D. LongoAbstract:We propose a solid state-based spectroscopy compact apparatus for monitoring environmental SO2, particularly suitable, for example, for volcanic applications. A prototype system, with a 170-mm long optical path, was assembled and tested using a commercial LED operating at 285 nm and a large area silicon carbide. The laboratory tests were carried out using calibrated quartz cuvettes containing SO2 at fixed concentrations and standard SO2 gas with 20% of O2 and complemented with N2 dry gas to fill the optical system chamber. Optical signal attenuations in the chemically interactive chamber follow the Beer-Lambert-Bouguer Law in all the performed tests and a 0.16 ppm/pA nominal chemical resolution and ± 0.8 ppm concentration error were obtained from the experimental data for the current prototype.
