On Tuesday, April 8, 2014 4:13:49 PM UTC-4, Phil Hobbs wrote:   
   > On 04/08/2014 03:17 PM, ggherold@gmail.com wrote:   
   >    
   > > On Monday, April 7, 2014 9:23:13 PM UTC-4, sgpopt...@gmail.com wrote:   
   >    
   > >> Optics are simple. I have a laser source with a special optic (DOE). It   
   essentially generates a top hat rectangle. The object that we are looking at   
   is in cylindrical shape and has a diffused reflection. The receiver side, I   
   have a CPC. CPC has a    
   gain of 3.   
   >    
   > >   
   >    
   > > For those of us playing along at home...   
   >    
   > > DOE = department of energy?   
   >    
   > > CPC = a camera lens?   
   >    
   > > Gain of 3 = area of lens/area of PD? (PD = photodiode)   
   >    
   > >   
   >    
   > > Thanks,   
   >    
   > > George H.   
   >    
   >    
   >    
   >    
   >    
   > Tsk tsk, you've caught the top-posting malady from the OP. ;)   
   >    
   > DOE = diffractive optical element   
   >    
   > CPC = compound parabolic concentrator   
   Oh, like a light pipe that's parabolic. (I used cones in the FIR)   
   You get all sorts of off angle light at the bottom of one of those.. fine for   
   a FIR bolometer but I don't know about a PD.   
       
   >    
   > Gain of 3 = area of input face of CPC / area of output face.   
   >    
   OK at least I got the gain part right :^)   
   Thanks,   
   George h.   
   >    
   > Cheers   
   >    
   >    
   >    
   > Phil Hobbs   
   >    
   >    
   >    
   > --    
   >    
   > Dr Philip C D Hobbs   
   >    
   > Principal Consultant   
   >    
   > ElectroOptical Innovations LLC   
   >    
   > Optics, Electro-optics, Photonics, Analog Electronics   
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