[8.4.1.7] A hollow sphere whose internal surface is a diffuse reflector and is as spectrally non-selective as possible.

Notes:

1) Two principle uses are: a) to geometrically sum the spatially total flux emitted by a radiator, and b) to eliminate the spatial and polarization inhomogenities of radiation at the input to optical instruments.

2) This sphere is sometimes known as an Ulbricht sphere.

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