SCATMECH > Classes and Functions > Surface Scattering Models > Finite_Aperture_Instrument_BRDF_Model

class Finite_Aperture_Instrument_BRDF_Model

The class Finite_Aperture_Instrument_BRDF_Model calculates the light scattering averaged over a solid angle given by a circular detector with uniform sensitivity. It accepts as a parameter another BRDF_Model and a half angle for the detector.

Diagram illustrating the Finite_Aperture_Instrument_BRDF_Model.

Parameters:

Parameter	Data Type	Description	Default
lambda	double	Wavelength of the light in vacuum [µm]. (Inherited from BRDF_Model.)	0.532
type	int	Indicates whether scattering is evaluated in reflection (0) or transmission (1). (Inherited from BRDF_Model.)	0
substrate	dielectric_function	The optical constants of the substrate, expressed as a complex number (n,k) or, optionally, as a function of wavelength. (Inherited from BRDF_Model.)	(4.05,0.05)
alpha	double	The half angle in degrees of the circular aperture over which the scattering is averaged. Integration is performed over this circular aperture, using a 21-point integration scheme described in Section 25.4.61 of Handbook of Mathematical Functions, by M. Abramowitz and I.A. Stegun, (Dover, New York, 1965).	0
model	BRDF_Model_Ptr	The light scattering model. Note: The parameters above, which are inherited from BRDF_Model, override those parameters of the light scattering model. That is, the parameters lambda, type, and substrate override model.lambda, model.type, and model.substrate, respectively.	Microroughness_BRDF_Model

Include file:

#include "finiteaperture.h"

Source code:

finiteaperture.cpp

Definition of public elements:

class Finite_Aperture_Instrument_BRDF_Model
  : public Instrument_BRDF_Model
{
};

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