Radiometry - Definition and Overview

In telecommunication and physics, radiometry is the science of radiation measurement.

SI radiometry units edit (http://www.wordiq.com/definition/Template:SI_radiometry_units)
Quantity	SI unit	Symbol	Notes
radiant energy	joule	J	energy
radiant flux	watt	W	radiant energy per unit time, also called radiant power
radiant intensity	watts per steradian	W · sr^-1	power per unit solid angle
radiance	watts per steradian per square metre	W &middot sr^-1 · m^-2	power per unit solid angle per unit area
irrradiance	watts per square metre	W · m^-2	power per unit area, also called radiant emittance or radiant exitance
spectral radiance	watt per steradian per cubic metre	W · sr^-1 &middot m^-3	commonly measured in W sr^-1m^-2nm^-1
spectral irradiance	watt per cubic metre	W · m^-3	commonly measured in W m^-2 nm^-1

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