No.2（1999）11.Calculation of emissivity by measuring reflectance and transmittance

Norifumi SASAMORI

We developed a measurement method for infrared emissivity on objects at room temperature. With this method, the object's infrared reflectance and transmittance was measured by an infrared spectrometer, and infrared absorptance was calculated as "1.0-(reflectance＋transmittance)", and brought out the infrared emissivity equal to infrared absorptance by Kirchhoff's law. The total emissivity, which is necessary for the infrared thermometry, was calculated from the spectral emissivity.

Keywords
Infrared emissivity, Infrared reflectance, Infrared absorptance, Infrared spectrometer, Kirchhoff's law, Total emissivity

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