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Old 22-12-2019, 01:03 AM
bgilbert (Barry gilbert)
barryg

bgilbert is offline
 
Join Date: Oct 2015
Location: tamworth
Posts: 66
Merlin66,
True, I left out the attenuation through the atmosphere. I considered It trivial In the context of the discussion, a dB or so, also the glass lens would attenuate the infra red, which Is about half the total energy. That avoids having to mention the CO2 in the atmosphere, boy, that could cause trouble.

If this not what you meant, give me the correct formula please.
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