Conservation of radiance definition of Conservation of radiance in the Free Online Encyclopedia.

radiance [′rād·ē·əns]

(optics)

The radiant flux per unit solid angle per unit of projected area of the source; the usual unit is the watt per steradian per square meter. Also known as steradiancy.

Radiance

The physical quantity that corresponds closely to the visual brightness of a surface. A simple radiometer for measuring the (average) radiance of an incident beam of optical radiation (light, including invisible infrared and ultraviolet radiation) consists of a cylindrical tube, with a hole in each end cap to define the beam cross section there, and with a photocell against one end to measure the total radiated power in the beam of all rays that reach it through both holes (see illustration). If A₁ and A₂ are the respective areas of the two holes, D is the length of the tube (distance between holes), and is the radiant flux or power measured by the photocell, then the (average) radiance is approximately given by the equation .

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radiance (redirected from Conservation of radiance)

radiance
(redirected from Conservation of radiance)