20.500.12556/RUL-173797 Ovrednotenje efektivne emisivnosti merjenca s sevalnim termometrom Evaluation of the effective emissivity of the measured object with a radiation thermometer Pri uporabi sevalnih termometrov je potrebno pred meritvijo temperature na sevalnem termometru nastaviti emisivnost merjene površine, da prikaže točno temperaturo. Cilj te magistrske naloge je iz površine z znano temperaturo ovrednotiti efektivno emisivnost merjene površine oziroma merjenega vzorca. V magistrski nalogi je temperatura merjena s kontaktnim termometrom, termografsko kamero in pirometrom. Vzorec je nameščen na ploščni kalibrator, ki ga segreje do želenih temperatur. Vzorci so kovinske ploščice iz bakra, nerjavečega jekla in medenine, na katerih je nanešen premaz različne debeline. Nekateri vzorci so bili pomerjeni dvakrat, da bi poleg rezultatov videli ponovljivost meritev. Meritve bakrenih vzorcev so se z vsakim segrevanjem očitno razlikovale, kar je nakazovalo na njihovo nestabilnost. Meritve vzorcev iz medenine in nerjavečega jekla se med prvim in drugim merjenjem niso veliko razlikovale in so bile tako primerne za nadaljnjo analizo. Ovrednotene emisivnosti so podobne emisivnosti kovin pridobljenih iz literature. Do odstopanj pride zaradi oksidacij in nanosa na vzorcih. Pri bakrenih vzorcih opazimo, da se vrednost efektivne emisivnosti približuje vrednosti emisivnosti oksidiranega bakra iz literature, s čimer potrdimo teoretično predpostavko. When using radiation thermometers, it is necessary to set the emissivity of the measured surface on the radiation thermometer before measuring the temperature to obtain the accurate temperature measurement. The aim of this master’s thesis is to evaluate the effective emissivity of the measured surface or sample based on a surface with a known temperature. In this work the temperature was measured with a contact thermometer, a thermal camera, and a pyrometer. The sample was placed on a plate calibrator, which heated the sample to the desired temperatures. The samples were copper, stainless steel and brass plates coated with different thicknesses of coating. Some samples were measured twice to establish the repeatability of the measurement. Measurements of copper samples varied significantly with each heating, indicating their instability. Measurements of brass and stainless steel samples did not differ much between the first and second measurements and were therefore suitable for further analysis. The emissivities in this work are similar to the values of the ones from the literature. Deviations occur due to oxidation and coating on the samples. For copper samples, we could see that the effective emissivity value approaches the value for oxidized copper, further confirming that copper is not stable enough for measurement. efektivna emisivnost sevalni termometer termografska kamera pirometer ploščni kalibrator effective emissivity radiation thermometer thermal imaging camera pyrometer plate calibrator true false false Slovenski jezik Angleški jezik Magistrsko delo/naloga 2025-09-23 14:10:00 2025-09-23 14:10:08 2025-11-20 10:41:23 0000-00-00 00:00:00 2025 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 63195 257936899 Lovsin_Jan_-_Ovrednotenje_efektivne_emisivnosti_merjenca_s_sevalnim_termometrom.pdf Lovsin_Jan_-_Ovrednotenje_efektivne_emisivnosti_merjenca_s_sevalnim_termometrom.pdf 1 B2098C8311B8F085D6E37072C3D46E93 d19cebf03138f073d0305b169a4cb99c7e1337288deb1e3b6df8314780f5bc26 10ac1d63-9876-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=218456 Fakulteta za elektrotehniko 0 0 0