watts per steradian

См. также в других словарях:

• Steradian — The steradian (symbol: sr) is the SI unit of solid angle. It is used to describe two dimensional angular spans in three dimensional space, analogous to the way in which the radian describes angles in a plane. The name is derived from the Greek… …   Wikipedia

• W/sr — watts per steradian …   Medical dictionary

• W/sr — • watts per steradian …   Dictionary of medical acronyms & abbreviations

• Radiance — For other uses, see Radiance (disambiguation). Radiance and spectral radiance are radiometric measures that describe the amount of radiation such as light or radiant heat that passes through or is emitted from a particular area, and falls within… …   Wikipedia

• Photometry (optics) — This article deals with the usage of this term in optics and lighting .Photometry is the science of measurement of light, in terms of its perceived brightness to the human eye. It is distinct from radiometry, which is the science of measurement… …   Wikipedia

• Light intensity — Several measures of light are commonly known as intensity:*Radiant intensity is a radiometric quantity, measured in watts per steradian (W/sr). *Luminous intensity is a photometric quantity, measured in lumens per steradian (lm/sr), or candela… …   Wikipedia

• flick — (f)    a unit of spectral radiance used in optical and communications engineering.    Radiance is the power radiated per unit solid angle per unit of emitting surface.    Radiance varies with wavelength, and to measure this variation spectral… …   Dictionary of units of measurement

• candela — (cd)    the SI base unit for measuring the intensity of light. Candela is the Latin word for candle.    The unit has a long and complicated history. Originally, it represented the intensity of an actual candle, assumed to be burning whale tallow… …   Dictionary of units of measurement

• radiant intensity — noun : the radiant energy that is emitted by a source per unit time per unit solid angle in a given direction under conditions that the source may be considered as sensibly a point source and that is measured in units of watts per steradian …   Useful english dictionary

• Exposure (photography) — Underexposure redirects here. For the 2005 film by Oday Rasheed, see Underexposure (2005 film). A long exposure showing stars rotating around the southern and northern celestial poles. Credit: European Southern Observatory …   Wikipedia

• Watt — For other uses, see Watt (disambiguation). Kilowatt redirects here. For the community in Kern County, California, see Kilowatt, California. KW redirects here. For other uses, see KW (disambiguation). The watt (pronounced /ˈwɒt/ wot; symbol: W) is …   Wikipedia