étendue

Tanımlar (İngilizce)

1. isim 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.

   “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.”

2. isim Alternative form of etendue.

   “The light power transmitted to the detector is proportional to the product of the solid angle #92;mathit#123;#92;Omega#125; and area A in the central plane, which is imaged by the lens onto the aperture (often called the étendue U).”