From: mscir@yahoo.com   
      
   On 10/4/2017 6:16 AM, ggherold@gmail.com wrote:   
   > On Tuesday, October 3, 2017 at 9:55:37 PM UTC-4, malna...@gmail.com wrote:   
   >> Hi All,   
   >>   
   >> I am working on a project: we have a light sensor with only around 40   
   degrees field of view. Our goal is to measure the strength of the sunlight   
   without introducing too much of a bias based on the time of the day - when the   
   sun shines at a different    
   angle. We want to keep the sensor stationary.   
   >>   
   >> I was thinking about using a set of lenses to change the angle of the rays   
   but I am stuck, since one lens would only focus the parallel rays of different   
   angles to different points in the focal plane - and our sensor has a fairly   
   small surface area.   
   >>   
   >> Some of the diffusers I have found were only changing the angles with up to   
   10 degrees which is not enough, since we want to measure from -75 to 75   
   degrees.   
   >>   
   >> Another concern is to find a solution which doesn't filter out much of the   
   light spectrum.   
   >>   
   >> Does anyone have any ideas on how to solve this challenge?   
   >>   
   >> Thank you in advance!   
   >   
   > Forest Mims has a whole bunch of stuff using led's to measure sky light.   
   > http://www.forrestmims.org/scientificresearch.html   
   > (I don't know if that's what you're trying to do.)   
   >   
   > How about a number of sensor's pointing in different directions,   
   > then keep track of the time of day.  And do some math.   
   >   
   > Why don't you want to use a solar tracker?   
   >   
   > George H.   
   >   
   Rotate the sensor once every n minutes, plot the maximum readings over   
   time, feasible?   
      
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