exitance

exitance

English

Noun

exitance (plural exitances)

1. (physics) Flux (of radiation).
   • 1984-7, John E. Kaufman, Jack F. Christensen, (Illuminating Engineering Society of North America), IES lighting handbook: Volume 1984:

     The entire east sky provided an equivalent exitance of 19 kilolumens per square meter (Method 1) […]

   • 1998, Glenn D. Boreman, Basic electro-optics for electrical engineers, page 49:

     For a given temperature, exitance is a function of wavelength. This results in a family of spectral exitance curves dependent on temperature. The equation for spectral exitance is the Planck equation: […]

   • 1999, Joseph Caniou, Passive infrared detection: theory and applications, page 42:

     In practice, unless otherwise indicated, it is accepted that exitance is taken to be a hemispherical quantity.

   • 2006, Craig M. Payne, Principles of Naval Weapon Systems, page 104:

     Exitance is the amount of power per unit area expressed in watts per square meter (w/m2), or square centimeter (w/cm2), that leaves a surface and is radiated into a hemisphere.