Mysterious Ball Lenses: What Are They & What Are They Used For?

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Ball lenses are optical components primarily utilized for coupling light into fibers, enhancing efficiency in optical systems. They also have diverse applications, including in weather recorders like the Campbell-Stokes recorder, which measures sunlight duration. The unique shape of ball lenses allows for effective light focusing and dispersion. Their versatility makes them valuable in various fields, from telecommunications to meteorology. Understanding their applications can lead to innovative uses in technology and science.
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any idea what these ball lenses are.. ? any specific application?
 
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http://www.edmundoptics.com/TechSupport/DisplayArticle.cfm?Articleid=245
 
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