Излучательная способность поверхности равна отношению интенсивности излучения с этой поверхности к интенсивности излучения абсолютно черного тела при той же температуре. В большинстве случаев поверхность имеет коэффициент излучения меньше 1. Чтобы это учесть, в большинстве пирометров предусмотрена возможность установки коэффициента излучения. При этом показания пирометра автоматически корректируются. Emissivity setting The emissivity of a surface is the ratio between the radiation emitted from this surface and the radiation from a blackbody at the same temperature. The emissivity describes a thermo-physical material characteristic, which in addition to the chemical composition of the material may also be dependent on the surface structure (rough, smooth), the emission direction as well as on the observed wavelength and the temperature of the measured object. In most measuring situations a radiation thermometer is used on a surface with an emissivity significantly lower than 1. For this purpose most thermometers have the possibility of adjusting the emissivity setting. The temperature reading is then automatically corrected.