Reflectance Coating and Stability
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Reflectance Coating and Stability

The primary purpose of an integrating sphere is to evenly distribute the radiometric energy emitted by a light source.  A detector placed on the wall of the integrating sphere, properly shielded from direct exposure to the source, measures the radiometric energy.

An ideal integrating sphere would be perfectly spherical with no anomalies from ports, baffles, or other structures.  It would reflect 100% of incident radiometric energy on its inner walls.  Finally, that radiometric energy would be diffusely reflected - meaning that the angle of reflection would have no correlation to the angle of incidence.

In practical application, there are no perfect integrating spheres.  Spheres must have ports, baffles, and other anomalies.  There are no diffuse reflecting materials that reflect 100% of incident energy.

The goal is to get as close to the ideal integrating sphere system as is practical to ensure accurate, repeatable results.


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