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Question Surface Parameters of Unified Model 

Forum: Processes Involving Optical Photons
Date: 22 Sep, 2010
From: Susanne Jungmann <Susanne Jungmann>


unfortunately there are still some not answered questions about the dependencies of the surface parameter of the unified model. I found the following lines within a paper of 2009 that I don't understand:

The unified model was used with the reflection type set to 100% specular lobe distribution. The surface type was set to dielectric_dielectric for all reflectors except for the ESR film and the Photo Multiplier Tube, where it was set to dielectric_metal. The surface finish was set to groundbackpainted for all materials except for the ESR film and the PMT, where it was set to ground.(The reflection type defines the surface reflection, whereas the dielectric_dielectric with groundbackpainted defines a Lambertian reflector attached to the surface, and dielectric_metal with ground defines a specular reflector attached to a transparent surface, respectively.)

Especially the last part concerning a ground surface with dielectric_metal surface type: how can they claim to still simulate a reflector backing the crystal? What would be simulated if one took dielectric_metal and groundbackpainted?

Concerning polishedbackpainted: As I understood, sigma_alpha is ignored, but not the Unified parameters. So contrary to an earlier post, there will be spike,lobe, backscattering or Lambertian (depending on the parameters one sets) reflection at the interface crystal/gap and only spike reflection (= specular refelction) at the backing!

I'm sorry for asking these questions, but I coulnd't find an answer in older posts!

Thanks a lot for your explanations,

cheers, Susanne Jungmann

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1 Feedback: Re: Surface Parameters of Unified Model   (Gumplinger Peter - 22 Sep, 2010)
(_ Question: Re: Surface Parameters of Unified Model   (Susanne Jungmann - 26 Sep, 2010)
(_ Feedback: Re: Surface Parameters of Unified Model   (Gumplinger Peter - 27 Sep, 2010)
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