etendue

名词 n.
中文释义
英 /ˌeɪ.tɒnˈd(j)uː/    美 /ˌeɪ.tɑnˈdu/

英文释义

名词 n.
  1. A conserved property of the light in an optical system which characterizes how "spread out" the light is in terms of angle and area: it is the product of its cross-sectional area (normal to the direction of propagation) and the solid angle it subtends. uncountable
    — The topics include […] carefully outlining the concepts of etendue, finesse, and their theoretical implications; methods of spectral, spatial, temporal, and polarization discrimination; and application of these topics to search and track systems.

词形变化

étendue alternative

词源

Borrowed from French étendue (“area, expanse; size; extent, range, scale”), short for étendue géométrique (“geometric extent”).
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