&lt;title&gt;Guerap II - A Computer Program For The Analysis Of The Stray Radiation Rejection Capabilities Of Optical Systems&lt;/title&gt;

Boyce, B.

doi:10.1117/12.964598

Cited by 3 publications

(2 citation statements)

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“…La dirección de propagación de estos rayos se genera mediante una función de distribución espacial que puede depender de la naturaleza de la superficie. Un método habitual para el cálculo de la dirección de reemisión es el de Monte Carlo [11,12,13]. No obstante, este método presenta el grave inconveniente de necesitar de un elevado número de elementos para poder obtener suficiente precisión de cálculo.…”

Section: Especificaciones Del Modelo Difusorunclassified

Influence of the number of re-emitters on a diffuser modelling for the optimization stage

Nieto¹,

Marti²

2016

Opt. Pura Apl.

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ABSTRACT:Inside the process of optical design, the diffusion phenomenon is usually set apart until the final stage: the study of tolerances. So, its influence is evaluated considering the whole of the system after having designed it taking into account all other parameters. The phenomenon of diffusion is relevant in many optical designs and its influence can determine the final design. So, this procedure, relegating diffusion to stage study, does not means that its influence over the system isn't heavy, but stems from the high computational cost of considering it on earlier stages. But there is a way to include it before the tolerances study stage by using a dual optimization process with an on/off mechanism. Thus the best system configuration is obtained considering the diffusion. In order to reduce the computation time we adjust dynamically the values of the diffuser model control parameters. The number of re-emitters is one of these strategic control parameters, inside this parameter are included two different values, the number of reemitting focus and the number of reemitting rays considered. Varying this value, different degrees of model accuracy can be obtained, allowing to adapt the model accuracy depending on the merit function instantaneous value. In this paper we analyse the use of a diffuser model, varying the parameter of the number of reemitters, and its influence on optical system computer aided design (CAD). We make so by employing a simple system consisting on a light source, a biconvex lens, on which the diffusion model is applied only on the second surface, and a detection display.Key words: optical design, scattering, stray light, optical diffusion, ray tracing, surface modelling, optimization RESUMEN:En el marco de trabajo del diseño óptico, el fenómeno de la difusión normalmente queda relegado a la fase final del estudio de tolerancias, momento en el que se valora su influencia en el sistema ya diseñado. El hecho de relegar la difusión a la etapa de estudio no es indicador de que no pueda influir en el diseño, sino del alto coste computacional que implicaría su inclusión en etapas anteriores. En múltiples diseños ópticos resulta relevante el fenómeno de la difusión y su influencia puede determinar cómo se realiza el diseño. Una manera de incluirlo en las etapas previas a la etapa de estudio de tolerancias es mediante el uso de un proceso de optimización dual con un mecanismo de transición que activa/desactiva el modelo de difusión dentro del propio proceso. De esta manera se obtiene la mejor configuración teniendo en cuenta la difusión que presenta el sistema. Una manera de reducir el tiempo de cómputo consiste en adaptar los valores de los parámetros de control del modelo de difusor dinámicamente siendo uno de los parámetros estratégicos el número de elementos de reemisión, este parámetro está formado por el número de focos de reemisión y el número de rayos que se consideran en el modelo. Mediante la variación de este valor se obtienen diferentes grados de precisión del modelo, lo que nos p...

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Section: Especificaciones Del Modelo Difusorunclassified

Influence of the number of re-emitters on a diffuser modelling for the optimization stage

Nieto¹,

Marti²

2016

Opt. Pura Apl.

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“…The APART /PADE software In APART /PADE, the power increment that arrives at a receiving surface is the product of three terms, i.e., dPl = (dP0) (7 x BRDF) (GCF) (1) where dP0 is the power increment on the scattering surface, BRDF is the bi-directional reflection distribution function of the scattering surface, and GCF, which is the geometrical configuration factor between the source and the collector, is proportional to the projected collector solid angle seen by the source.…”

Section: Introductionmentioning

confidence: 99%

<title>The Use Of Real Ray Tracing To Extend APART Analysis To Systems Having Specular Nonimaging Baffles</title>

Rock¹

1983

SPIE Proceedings

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The APART /PADE stray radiation analysis program uses paraxial image theory to transfer radiation through lenses or to reflect it from mirror surfaces. However, this theory is inadequate in analyzing systems having specular nonimaging surfaces for the rejection of aperture heat loads.This paper describes two methods by which the capabilities of APART/ PADE can be extended by means of real-ray -based algorithms. The first method is to use ray tracing to calculate geometrical configuration factors (GCFs) when nonimaging specular reflections are involved. The GCFs can then be appended to the files used in Program 3 of APART /PADE. This approach can be easily extended by ray -splitting techniques to include the effects of surface scatter from the specular baffles. The second method is to use ray tracing to define a synthetic BRDF for a complex reflective baffle. The synthetic BRDF can be input to APART /PADE in the form of a lookup table, and it can accurately model the distribution of radiation emerging from the baffles.An example of this method is the analysis of an off -axis rejection test in which light from the radiation source is reflected from the baffle into the test chamber and thereby significantly increases the chamber background radiation.

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Influence of black-target size and detection aperture on veiling-glare measurements

Wang

1994

Opt. Eng

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<title>Guerap II - A Computer Program For The Analysis Of The Stray Radiation Rejection Capabilities Of Optical Systems</title>

Cited by 3 publications

References 1 publication

Influence of the number of re-emitters on a diffuser modelling for the optimization stage

Influence of the number of re-emitters on a diffuser modelling for the optimization stage

<title>The Use Of Real Ray Tracing To Extend APART Analysis To Systems Having Specular Nonimaging Baffles</title>

Influence of black-target size and detection aperture on veiling-glare measurements

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