Ovrednotenje črnih teles

The demand for reliable measurements with radiation thermometers and thermal imagers has never been in such a strong focus as it has been now during the pandemic situation. Besides the monitoring of the body temperature these devices can cover a wide temperature range and are key devices that determine the quality of the final product in different industries. The calibration of these devices is performed using reference temperature radiation sources with high emissivity. Before performing the calibration of radiation thermometers or thermal imagers, the uncertainty components coming from the temperature stability and homogeneity of the blackbody temperature radiation sources have to be determined. These uncertainty components contribute significantly to the final uncertainty. In this thesis, evaluation of temperature stability and homogeneity was performed for the blackbodies in the temperature range from -30 °C to 1500 °C. Most of these blackbodies are used in the accredited temperature calibration laboratory and the evaluation of these calculations can be used by the laboratory to calculate the calibration measurement capability.Povpraševanje po zanesljivih meritvah s sevalnimi termometri in termovizijskimi kamerami še nikoli ni bilo v tako močnem fokusu, kot je bilo zdaj v času pandemije. Poleg spremljanja telesne temperature lahko te naprave pokrivajo tudi široko temperaturno območje in so ključne naprave, ki določajo kakovost končnega izdelka v različnih panogah. Kalibracija teh naprav se izvaja z uporabo referenčnih temperaturnih virov sevanja z visoko emisivnostjo. Pred kalibracijo sevalnih termometrov ali termovizijskih kamer je treba določiti prispevke negotovosti, ki izhajajo iz temperaturne stabilnosti in homogenosti temperaturnih virov, to je črnih teles. Ti prispevki negotovosti pomembno prispevajo h končni negotovosti. V tej nalogi je bila za črna telesa izvedeno ovrednotenje temperaturne stabilnosti in homogenosti v temperaturnem območju od -30 °C do 1500 °C. Večina teh črnih teles se uporablja v akreditiranem kalibracijskem laboratoriju za umerjanje termometrov, laboratorij pa lahko za izračun kalibracijskih merilnih zmogljivosti uporabi ocene teh izračunov