Ocenjevanje efektivne emisivnosti merjenca s sevalnim termometrom

MUJANOVIĆ, HARIS (author), Pušnik, Igor (mentor), Mlačnik, Vid (comentor)

Predstavili smo dve metodi eksperimentalnega ugotavljanja efektivne emisivnosti. Prva sledi definiciji, kjer je emisivnost razmerje jakosti izseva površine proti izsevu črnega telesa pri enakih pogojih (temperatura, spektralna karakteristika senzorja, geometrijski pogoji). Druga pa je prilagajanje nastavitve efektivne emisivnosti na sevalnem termometru do izenačitve izmerjene sevalne temperature s pravo temperaturo merjenca (točno izmerjene s kontaktnim termometrom). V poskusu smo za ugotavljanje emisivnosti uporabili obe opisani radiometrični metodi. Pridobljene rezultate smo razvrstili v tabele in iz njih izdelali grafe, ki smo jih analizirali. Prišli smo do zaključka, da pri računski metodi končne vrednosti efektivne emisivnosti, z višanjem temperature med obema metodama, konvergirajo. Te se bližajo vrednostim metode prilagajanja, ki pa so skoraj konstantne tekom meritev.

• Language: Slovenian
• Keywords: emisivnost, meritev, sevanje, črno telo
• Work type: Bachelor thesis/paper
• Organization: FE - Faculty of Electrical Engineering
• Year: 2023
• PID: 20.500.12556/RUL-150458
• COBISS.SI-ID: 165246723
• Publication date in RUL: 18.09.2023

MUJANOVIĆ, HARIS, 2023, Ocenjevanje efektivne emisivnosti merjenca s sevalnim termometrom [online]. Bachelor’s thesis. [Accessed 5 April 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=150458

Secondary language

• Language: English
• Title: Assessment of effective emissivity of a measurand with a radiation thermometer

Abstract

We presented two methods of experimental determination of effective emissivity. The first follows the definition where emissivity is the ratio of surface radiation intensity to black body radiation intensity under the same conditions (temperature, spectral characteristics of the sensor, geometrical conditions). The second method is adjusting the effective emissivity setting on the radiation thermometer until the measured radiation temperature equals the true temperature of the target (accurately measured with a contact thermometer). In the experiment, we used both described radiometric methods to determine the factor of emissivity. We obtained and organised the results into tables and created graphs from them, which we then analysed, and concluded that with the calculation method the final values of the effective emissivity converge with increasing temperature. These are close to the values of the adjustment method but are almost constant during the measurement.

• Keywords: Emissivity, Measurement, Radiation, Black Body