IncoherentReflector

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LL_IncoherentReflector

View Inside IncoherentReflector:

LL_IncoherentReflector_Inside

 

IncoherentReflector models the reflected return from an optically-rough surface illuminated by light with short temporal coherence. The return is modeled using the concept of multiple speckle realizations. First, the total intensity map incident on the reflector is computed, then multiplied by the specified reflectance map to obtain the reflected intensity. To generate each speckle realization, we create a field with the reflected-intensity map and a spatially uncorrelated random phase map (each speckle realization is formed just as in the CoherentTarget module): this field is then propagated to the subsequent sensor plane to form one speckle realization. Finally, the intensities at the sensor plane of a specified number of speckle patterns are simply added. The principal degree of freedom in the model is the number of speckle realizations to be added. See the LightLike User Guide for further discussion of the properties and options of LightLike's rough-reflector models. CoherentTarget, IncoherentReflector and PartiallyCoherentReflector are LightLike's three basic physical models for representing wave-optics scattering from an optically-rough surface.

C++ type

name

value

description

Parameters

Grid<double>

reflectance


Intensity reflectance map (BRDF)

double

dxymax

0.001

Maximum allowed mesh spacing for intensity integration

int

nWaves

1

Number of speckle realizations to be added at receiver

int

iseed

-987654333

Random number seed for speckle

Inputs

Light

incident

Light()

Describes all incident light

Outputs

Light

transmitted


Describes all transmitted light

Grid<double>

illumination


Intensity pattern of the incident illumination (W/m^2)

Grid<double>

returned

 

Intensity pattern of the returned illumination (W/m^2)