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.   
      
   --- SoupGate-Win32 v1.05   
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