摘要:

The governing equation of transfer, cross sections, and a modified discrete ordinates method for numerical solution of the transfer equation for a three dimensional leaf canopy are formulated. Models for the total interaction and scattering cross sections are proposed, and preliminary transport calculations are reported. Convergence acceleration of the iteration on the scattering source using the coarse mesh rebalancing method and convergence criteria are discussed. The extent of flux distortions such as negative and oscillatory fluxes, ray effects, etc. is assessed, and their implications for optical radiometric remote sensing is discussed.

ISSN:0041-1450    

DOI:10.1080/00411459008203890

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

Chandrasekhar's method of solution is applied to the one-angle photon transport equation in a 1-D finite plant canopy where all leaves are oriented in the same direction. An analytical expression for the reflected intensity in terms of the reflected and transmitted intensities for the canopy with vacuum boundary conditions is obtained and numerically evaluated.

ISSN:0041-1450    

DOI:10.1080/00411459008203891

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

An initial value method for determining the radiation field in a plane-parallel atmosphere is extended to include polarization. Using the first principle of invariance by Chandrasekhar we eliminate the intensity of the upward radiation from the equation of transfer thus formulating the Cauchy problem. The concomitant scattering matrix satisfies the well-known integro-differential equation and after having determined this matrix we may solve the equation of transfer itself. Next, the Chandrasekhar principle allows us to find the intensity of the upward radiation, thus completing the solution.

ISSN:0041-1450    

DOI:10.1080/00411459008203892

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

Transfer of polarized light in anisotropic plane-parallel media, consisting of arbitrarily oriented nonspherical particles, is considered. Adding equations and a complete set of invariant imbedding equations for reflection and transmission matrices are derived.

ISSN:0041-1450    

DOI:10.1080/00411459008203893

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

In order to determine the diffuse reflection from a medium bounded by a rough surface, we consider the problem of radiative transfer in a boundary layer characterized by a statistical distribution of heights. For the case that the surface is defined by a multivariate normal probability density, we derive the propagation probability for rays traversing the boundary layer and, from that probability, a corresponding radiative transfer equation. A solution of the Eddington (two stream) type is found explicitly, and examples are given. The results should be applicable to reflection from the regoliths of solar system bodies, as well as from a rough ocean surface.

ISSN:0041-1450    

DOI:10.1080/00411459008203894

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

A finite-difference discrete-ordinate iterative method developed to solve the three-dimensional (3D) radiative transfer equation is described. The method is applicable to a volume of ocean with position dependent volumetric absorption and scattering coefficients. Input quantities include sun position and sky radiance distribution, scattering phase function, and absorbing, reflecting, or emitting objects within the ocean volume. A solution of the one-dimensional radiative transfer equation is used to provide boundary values for the 3D solutions. Radiance distributions are calculated which model recent ocean radiance measurements showing ship shadow effects. The results are compared.

ISSN:0041-1450    

DOI:10.1080/00411459008203895

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

An iterative algorithm is proposed for simultaneously estimating the optical thickness of a homogeneous, plane-parallel medium and the albedo of an obscured underlying surface. Only remote measurements outside the medium are required of the ingoing and outgoing radiance. The method incorporates analytically-computed first derivatives of the unknowns that are obtained from the Fn method of transport theory. The ill-posed nature of the problem is quantified in terms of sensitivity coefficients.

ISSN:0041-1450    

DOI:10.1080/00411459008203896

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

A response matrix method is formulated for time-independent multi-dimensional, grey radiative transfer problems in which both scattering and absorption-emission are present and which are nonlinear as a result of temperature-dependent heat sources. The method is in sharp contrast to iterative techniques in which each iteration consists of a computation of the radiation intensity over the entire space-angle domain before the temperature field is updated. The nonlinear response matrix approach is unique in that within each spatial cell the temperature and outgoing radiation intensity are calculated in response only to the incoming radiation intensity. The updating of the temperature distribution therefore is placed within the iterative solution for the radiation intensity, rather than being placed outside of it.

ISSN:0041-1450    

DOI:10.1080/00411459008203897

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

A new method is developed for coupling the energy equation to the equation of transfer for combined conductive-radiative heat transfer problems. The radiative transfer equation is solved by the Pnmethod with particular solution computed from the (arbitrary) source distribution by qradratures.

ISSN:0041-1450    

DOI:10.1080/00411459008203898

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

ISSN:0041-1450    

DOI:10.1080/00411459008203889

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor