411 REFERENCE · Wiktionary
Christiansen filter
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Etymology
Named after Danish physicist Christian Christiansen (physicist) Christian Christiansen.
Noun
en optics uncommon A narrow bandpass or monochromatic optical filter which consists of an optical cell which is filled with a crushed substance (e.g. glass) and a (mostly organic) liquid.
Further reading
en eponyms