What is Emissivity – Infrared

If you deal with infrared, you’ll often come across the term Emissivity, but what does it mean?

The emissivity ε (energy radiation factor) is the ratio between the radiation intensity of a body and that of a blackbody at the same temperature.

When measuring a certain material precisely, this is the most important factor. If you need to measure the temperature of a surface with an infrared thermometer, then you need to know the emissivity of the material and adjust the instrument accordingly.

The tables below list the emissivity levels for metals and non-metals. The values given are approximate and may vary according to the surface and condition of the material.


Emissivity table for metals

Wat is emissiviteit

Emissivity table for non-metals

Would you like to find out more about emissivity? Or would you like advice on the optimum way to measure your equipment?

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