Illumination Calculators

Always use the same units (inches or mm) in each calculation (unless indicated).
Enter your numbers into the yellow cells. To recalculate, press the TAB key, or click in another yellow box, or
\click the Update button. Other formulas you’d like to see? Todd@fiberopticsystems.com

       
Illumination Circle Size Bundle Dia. Fiber NA Distance Circle Size    
   
NA = Sin of Half Angle = Numerical Aperture is an angle measurement and is specified by the fiber manufacturer.    
     
Size of a Collimated Beam NA Bundle Dia. Lens Focal Length Beam Dia. at Focal Length Diver-gence Full Angle (radians) Diver-gence Full Angle (degrees) Distance From Lens Focus Beam Dia. at Distance    
   
         
   
Convert Feet Feet Inches mm Meters    
   
     
Convert mm mm Inches Feet Microns    
   
     
Convert meters Meters Feet Inches mm