[Radiance-general] Infrared scene simulation

[Alexander Utz]

Hi All,

I'm currently trying to find a way to simulate the radiant power distribution for a given scene in the far infrared (about 8-14um wavelength). Using the search option I saw that there already was a discussion on this subject, but I can only find fragments of it - so please forgive me if I ask questions already answered ;).

So my question is: How can I model a blackbody source at about 300°K as radiation source?

I tried using blackbody.cal and and xyz_rgb.cal as I saw in another posting:

echo 300 100 | rcalc -f blackbody.cal -f xyz_rgb.cal -e 'xi=cct_x($1);yi=cct_y($1)' -Yi=$2;Xi=Yi*yi/xi;Zi=Yi*(1-xi-yi)/yi' -e '$1=R ( Xi,Yi,Zi ) ; $2=G ( Xi,Yi,Zi ) ; $3=B ( Xi,Yi,Zi ) '

and it results in 

18.3632205      143.92786       0

So I modeled the blackbody as polygon light source with this RGB values and it's real physical extent.

First of all I must admit I don't understand the YL lightning parameter (100 in this case). Shouldn't this already be clear by giving the temperature of the blackbody?

And are these values correct for the infrared radiation the blackbody emits at such low temperatures? Or do I still have to define the spectral range I'm interested in somehow?

It would be great if someone has already experience with thie and could give me some tips.

Thenks in advance and best regards

Alex

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