IEVref:845-25-086ID:
Language:enStatus: Standard
Term: aperture
Synonym1: aperture stop
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Definition: opening that defines the area over which average optical emission is measured

Note 1 to entry: For spectral irradiance measurements, this opening is usually the entrance of a small sphere placed in front of the radiometer/spectroradiometer entrance slit.


Publication date:2020-12
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