[Radiance-general] Description of complex glass systems (geometry+ material)

[Greg Ward]

Hi Marina,

Looks about right to me -- does it reproduce the combined  
transmittance and reflectance you're measuring?  Are the interfaces  
separated by an air gap, or are some/all layers laminated with an  
optical adhesive?  In the latter case, the functions in glaze2.cal  
won't compute the correct combined transmittance and reflectances.

-Greg

> From: marina aviles olmos <marina.aviles at gmail.com>
> Date: May 5, 2009 8:05:45 AM PDT
>
> Hi Robin, hi All
>
> yes I want to simulate a laminated glass in a double glass system.  
> This
> laminated glass is a prototyp of a glazing system and there is no
> information about it anywhere. It is also a quite complicated system
> with embeded coating and interlayer and I can get its description from
> Optics5. That's why I think the way to describe this glasses are with
> the spectrometer measurements.
>
> I am still not sure anyway if I describe the glasses propertly.
> Does anybody knows if this is right like this:
>
> #window geometry:
>
> double_glazing_a    polygon    window
> 0
> 0
> 12    0        -0.18    0
>         0        -0.18    3.34
>        4.13    -0.18    3.34
>        4.13    -0.18    0
>
>
> #window material:
>
> void BRTDfunc double_glazing_a
> 10
> if(Rdot,cr(fr(rf1_r),ft(t1_r),fr(rf2_r)),cr(fr(rb2_r),ft(t2_r),fr 
> (rb1_r)))
> if(Rdot,cr(fr(rf1_g),ft(t1_g),fr(rf2_g)),cr(fr(rb2_g),ft(t2_g),fr 
> (rb1_g)))
> if(Rdot,cr(fr(rf1_b),ft(t1_b),fr(rf2_b)),cr(fr(rb2_b),ft(t2_b),fr 
> (rb1_b)))
> ft(t1_r)*ft(t2_r)
> ft(t1_g)*ft(t2_g)
> ft(t1_b)*ft(t2_b)
>         0 0 0
>         glaze2.cal
>
> 0
> 9
>         0 0 0
>         0 0 0
>         0 0 0
>
> where I just have to substitute the next measured data:
>
> Red: 700nm --     rf1_r    rb1_r     rf2_r     rb2_r    t1_r     t2_r
> Green: 546nm -- rf1_g    rb1_g    rf2_g    rb2_g    t1_g    t2_g
> Blue: 436 --         rf1_b    rb1_b    rf2_b    rb2_b    t1_b    t2_b
>
>
> Thanks again,
>
> Marina