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Solar Radiation Measurment

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Posted by Gary on September 3, 2004, 4:12 pm

I am looking for a simple circuit to measure solar radiation --
something that works from full sun down to very cloudy conditions.
Has anyone seen a circuit that might work?
Something with a linear response would be nice in that I could
calibrate it fairly easily under full sun conditions.
Reading the output with a multimeter would be fine.
I am not concerned about separating diffuse from direct radiation --
total radiation in the plane of the instrument would be fine.


Posted by Morris Dovey on September 3, 2004, 4:15 pm
Gary wrote:

How about a photographic light meter?

Morris Dovey
DeSoto, Iowa USA

Posted by Gary on September 3, 2004, 5:22 pm
 Morris Dovey wrote:

Hi Morris
I have one that reads in lux, but it will not give good readings up to
full sunlight -- i.e. pointed right at the sun.
I have thought about getting neutral filter to put over it -- maybe
this would work.

Thanks -- Gary

Posted by nicksanspam on September 3, 2004, 6:12 pm

PE Howdy Reichmuth says they aren't so good for measuring total spectral
power, including heat. He likes more radiometric techniques, like letting
something heat up in the sun. Steve Baer uses and IR thermometer with
a 3/8" thick black aluminum plate which has a convenient thermal mass.
Maybe measure a shorted diode current (is that what light meters do?)
or look for a circuit on Duane's redrok site...


Posted by Gary on September 3, 2004, 8:24 pm
 nicksanspam@ece.villanova.edu wrote:

Hi Nick,

I'll check out Duane's site.
I take it that if I end up getting the Daystar unit, that it does a
good job on total spectral power?


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