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Radiometry

In telecommunication, radiometry is the science of radiation measurement.

TABLE OF RADIOMETRIC TERMS
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[?]	E_λ	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[?]	L_λ	radiance[?] per unit wavelength interval at a given wavelength	W·sr^-1·m^-2·nm^-1

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