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Forum: Processes Involving Optical Photons
Re: Question difference between polished and polishedfrontpainted (Athreya Shankar)
Date: 17 May, 2012
From: Gumplinger Peter <Gumplinger Peter>

Hello Athreya,

> I would like to know the difference between polished and
> polishedfrontpainted.

I am afraid that 'polishedfrontpainted' set for a dielectric_dielectric surface is completely redundant with 'polished' set for dielectric_metal surface. While 'polished' for dielectric_dielectric is simply a perfectly smooth interface between two dielectric materials where you can have refraction as well as reflections. With 'polishedfrontpainted or 'groundfrontpainted' for a dielectric_dielectric it's the same as 'polished' and 'ground' for dielectric_metal surface, you only get reflections.

> In polishedbackpainted, I know that the polished
> refers to the wrapping, and that the interface between the scintillator
> and the 'air gap' is characterized by the sigma-alpha and the four
> probability distributions (specularspike, specularlobe,etc).

You are perfectly correct. In 'backpainted' the meaning of 'polished/ground' refers to the backing/wrapping/reflector while in the other cases 'polished/ground' refers to the metal or dielectric surface itself. A 'ground' dielectric_dielectric surface is still characterized but sigma-alpha and the reflection probabilities etc.

> But what does 'polished' in polishedfrontpainted refer to? If it refers
> to the interface between the paint and the scintillator, then what is
> the difference between polished and polishedfrontpainted?

see above

> Am I also right in saying that we must specify dielectric_dielectric for
> a scintillator wrapped with Al foil because the interface we are
> referring to is the one between the scintillator and the air-gap?

yes, true for the 'backpainted' options.

> (this
> also being the justification for why there is no backpainted option for
> dielectric_metal?)

I guess, you can argue that - the two would again become redundant.

Hope this clarifies the situation.

Peter

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1 Question: Re: difference between polished and polishedfrontpainted   (Athreya Shankar - 18 May, 2012)
(_ Feedback: Re: difference between polished and polishedfrontpainted   (Gumplinger Peter - 18 May, 2012)
(_ Feedback: Re: difference between polished and polishedfrontpainted   (Athreya Shankar - 19 May, 2012)
(_ Agree: Re: difference between polished and polishedfrontpainted   (Gumplinger Peter - 22 May, 2012)
(_ Feedback: Re: difference between polished and polishedfrontpainted   (Athreya Shankar - 23 May, 2012)
(_ Disagree: Re: difference between polished and polishedfrontpainted   (Gumplinger Peter - 23 May, 2012)
(_ Ok: Re: difference between polished and polishedfrontpainted   (Athreya Shankar - 23 May, 2012)
(_ Question: Re: difference between polished and polishedfrontpainted   (Erik Dietz-Laursonn - 10 Sep, 2012)
1 Feedback: Re: difference between polished and polishedfrontpainted   (Gumplinger Peter - 18 Sep, 2012)
1 None: Re: difference between polished and polishedfrontpainted   (Erik Dietz-Laursonn - 19 Sep, 2012)
2 Ok: Re: difference between polished and polishedfrontpainted   (Athreya Shankar - 03 Oct, 2012)
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