attenuance filter

Synonym: neutral-density filter
https://doi.org/10.1351/goldbook.A00514
An optical device (@F02384@) which reduces the @R05046@ of a light beam by a constant factor over all wavelengths within its operating range. Sometimes called attenuator or neutral density @F02384@.
Source:
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2229 [Terms] [Paper]