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

[marina aviles olmos]

Hi Greg,

first of all, there is a mistake in my previous mail. I wanted to say
< and I cannot get its description from Optics5.>

It is the latter case:
outside the laminate (glass pane + optical adhesive coating +... +
interlayer + ... + adhesive coating + glass) then the air gap and the
inside that is a float glass.
(It is a switchable glass in a double glazing)

How can I then describe this glasses?

(I have the possibility to measure the double glazing or the different
layers separately)
Just a naive idea that could helps:

If the combined R and T are the ones resulting from the hole double
glazing which could be measured in the spectrometer if I measure the
complete double glass and not the separated layers:

Total Reflectance front
Total Reflectance back
Total Transmitance

Could be with this data a way to describe them?


Marina


Greg Ward wrote:
> 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
>
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