0-9 | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z
The science of radiation measurement. See Table of Radiometric Terms.
Term | Symbol | Quantity | Unit |
---|---|---|---|
radiant energy | Q | energy | joule (J) |
radiant power Synonym optical power | power | watt (W) | |
irradiance | E | power incident per unit area (irrespective of angle) | Wm-2 |
spectral irradiance | E | irradiance per unit wavelength interval at a given wavelength | Wm-2nm-1 |
radiant emittance Synonym radiant exitance | W | power emitted (into a full sphere) per unit area | Wm-2 |
radiant intensity | I | power per unit solid angle | Wsr-1 |
radiance | L | power per unit angle per unit projected area | Wsr-1m-2 |
spectral radiance | L | radiance per unit wavelength interval at a given wavelength | Wsr-1m-2nm-1 |