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Question Reflection, refraction and transmitted angles 

Forum: Processes Involving Optical Photons
Date: 04 Feb, 2010
From: Paloma <Paloma>

Hi, I'm studying optics with geant4, now I'm testing all the parameters for a better understanding with a simple box. I would like to ask some questions. I created some variables to know the values of the incident, reflected and transmitted angles and I'm not sure id I'm doing fine. I would like that somebody correct my mistakes or make some explanation to understand better what I'm doing.

Cases:
1) Model = unified
   Type = dielectric_dielectric
   Specular lobe = 1

   i) Polished and sigma_alpha = 0 or sigma_alpha = 10. I obtained the same angles for the facets and the surfaces. Processes : refraction, reflection and total internal reflection.
My question is: is sigma_alpha ignored?it's everything ok?

   ii) Ground and sigma_alpha = 0 or sigma_alpha = 10. If I change sigma_alpha, the angles seem change, are different. Processes : refraction, lobe and absorption.

   iii) Groundbackpainted and sigma_alpha = 0 or sigma_alpha = 10. If I change sigma_alpha, the angles seem change, are different. Processes : refraction, lobe and absorption.

   iv) Groundfrontpainted and sigma_alpha = 0 or sigma_alpha = 10. If I change sigma_alpha, the angles seem change, are different. Processes : lambertian, absorption.

   v) Polishedfrontpainted and sigma_alpha = 0 or sigma_alpha = 10. If I change sigma_alpha, the angles seem the same, are equal. Processes : spike and absorption.

   vi) Polishedbackpainted and sigma_alpha = 0 or sigma_alpha = 10. If I change sigma_alpha, the angles seem the same, are equal. Processes : refraction,lobe reflection and absorption.

2) Model = unified
   Type = dielectric_dielectric
   Specular spike = 1

   i) Polished and sigma_alpha = 0 or sigma_alpha = 10. I obtained the same angles for the facets and the surfaces. Processes : refraction, reflection and total internal reflection. is sigma_alpha ignored?

   ii) Ground and sigma_alpha = 0 or sigma_alpha = 10.I obtained the same angles for the facets and the surfaces. Processes : refraction and specular spike.

   iii) Groundbackpainted and sigma_alpha = 0 or sigma_alpha = 10. If I change sigma_alpha I obtain different angles distribution. Processes : refraction, spike reflection and absorption.

   iv) Groundfrontpainted and sigma_alpha = 0 or sigma_alpha = 10. If I change sigma_alpha I obtain same angles. Processes : lambertian and absorption.

   v) Polishedfrontpainted and sigma_alpha = 0 or sigma_alpha = 10. If I change sigma_alpha, the angles are similar, bur I obtain more specular reflection for the surface(incident_angle_surface=outgoing_angle_surface). Processes : spike reflection and absorption.

   vi) Polishedbackpainted and sigma_alpha = 0 or sigma_alpha = 10. If I change sigma_alpha, the angles seem the same, are equal. Processes : refraction,spike reflection and absorption.

I'm not sure about all this afirmations. Anybody can help me?

I made a table with all the types of surfaces and all the possible processes,it's ok?

dielectric_dielectric

i) Polished : fresnel reflection, total internal reflection and refraction

ii) Ground : reflection(can be spike,lobe, backscattering or lambertian),refraction

iii) Groundbackpainted : reflection(only lambertian),refraction, absorption

iv) Groundfrontpainted : reflection(can be spike,lobe, backscattering or lambertian),refraction, absorption

v) Polishedfrontpainted : reflection(can be spike,lobe, backscattering or lambertian),refraction, absorption

vi) Polishedbackpainted : reflection(can be spike,lobe, backscattering or lambertian),refraction, absorption

dielectric_metal i) polished : reflection(can be spike,lobe, backscattering or lambertian), absorption

ii) ground: reflection(can be spike,lobe, backscattering or lambertian), absorption

Reflection is always lambertian in groundbackpainted and in polishedbackpainted or only in ground option,can occur in the other surfaces? Thank you for your time

Best regards

Paloma

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1 Feedback: Re: Reflection, refraction and transmitted angles   (Gumplinger Peter - 04 Feb, 2010)
1 None: Re: Reflection, refraction and transmitted angles   (Paloma - 05 Feb, 2010)
2 None: Re: Reflection, refraction and transmitted angles   (Paloma - 05 Feb, 2010)
1 None: Re: Reflection, refraction and transmitted angles   (Paloma - 09 Feb, 2010)
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