On Thursday, May 29, 2014 10:56:22 AM UTC-4, Helpful person wrote:   
   > On Thursday, May 29, 2014 8:08:07 AM UTC-4, haitic...@gmail.com wrote:   
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   > > It's worth mentioning that certain invisible wavelengths of the sun's   
   spectrum   
   >   
   > > are important to monitor, as they play an inordinate role in human   
   biology. 311   
   >   
   > >  nm. is necessary for vitamin D production, and perhaps other things. This   
   is   
   >   
   > > very variable, as this frequency is absorbed by the atmosphere.  I don't   
   know   
   >   
   > > any detectors to assess this. How would that be done? A filter + PD?   
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   > >   
   >   
   > > jb   
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   >   
   >   
   > That's why a bolometer may be the best instrument.   
   >   
   > Conceptually it can capture all wavelengths.  Very simply   
   >   
   > one could have an absorber that covers the whole spectrum   
   >   
   > (easier said than done, but not impossible) and measure   
   >   
   > temperature changes.  The real work is in the details.   
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   >   
   >   
   > http://www.richardfisher.com   
      
   The 311 stuff is no doubt a tiny fraction of the solar energy (.01% ?), so   
   a wavelength-selective method probably necessary...   
      
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