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Integrating Spheres: Collecting and Uniformly Distributing Light

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The integrating sphere is a simple, yet often misunderstood, device for measuring optical radiation.

Greg McKee, Labsphere, Inc.

An integrating sphere’s function is to spatially integrate radiant flux (light). However, before one can optimize a sphere design for a particular application, it is important to understand how an integrating sphere works. Integrating sphere theory originates in the principles of radiation exchange within an enclosure of diffuse surfaces. Although the general theory can be complex, it is easy to understand. The concept, simply put, is this: The radiation exchange between two areas on the integrating surfaces is independent of the viewing angle and the distance between the surface...Read full article

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