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Radiometry
In telecommunication, radiometry is the science of radiation measurement.
| Term | Symbol | Quantity | Unit |
|---|---|---|---|
| radiant energy[?] | Q | energy | joule (J) |
| radiant power[?] Synonym optical power | φ | power | watt (W) |
| irradiance[?] | E | power incident per unit area (irrespective of angle) | W·m-2 |
| spectral irradiance[?] | Eλ | irradiance[?] per unit wavelength interval at a given wavelength | W·m-2·nm-1 |
| radiant emittance[?] Synonym radiant exitance | W | power emitted (into a full sphere) per unit area | W·m-2 |
| radiant intensity[?] | I | power per unit solid angle | W·sr-1 |
| radiance[?] | L | power per unit angle per unit projected area | W·sr-1·m-2 |
| spectral radiance[?] | Lλ | radiance[?] per unit wavelength interval at a given wavelength | W·sr-1·m-2·nm-1 |
Source: from Federal Standard 1037C
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