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  • photometric sphere
  • integrating sphere A hollow sphere coated internally with a white diffusing material and provided with openings for incident beam, specimen and detector used for measuring the diffuse reflectance or transmittance of objects.  
  • photometry The science of the measurement of light intensity, where "light'' refers to the total integrated range of radiation to which the eye is sensitive. It is distinguished from radiometry in which each separate wavelength in the electromagnetic...
  • diffuser A device used to scatter or disperse light emitted from a source, usually by the process of diffuse transmission.
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