Re: mired

[T3D john bercovitz <bercov@xxxxxxxxxxx>]

Dr. George G writes:

> The distribution in energy of a black body is

OK, so I take that and pop it in an Excel spreadsheet and find:

    A             B                C                    

wavelength     temperature   black body emission    
 microns         Kelvin         watts/sq cm
                            per micron increment

  0.5             3000             81.9          
  0.5             4000            901.4     
  0.5             5000           3807.8   
  0.5             6000           9985.4

  0.6             3000            162.9           
  0.6             4000           1203.3
  0.6             5000           4012.9
  0.6             6000           9015.0

Excel formula:
    black body emission =37403/A4^5)/(EXP(14384/(A4*B4))-1)

So this tells me that to drop from 4000K to 3000K, I need to have 
a filter that takes out about 86% of the 600 nm light and 91% of 
the 500 nm light.  Same for dropping from 6000K to 4000K.  So in 
one case this same filter drops 1000K and in the other 2000K.
I don't see how the mired system can work.

John B


------------------------------