20.500.12556/RUL-180409 A comparison of radiometric and spectrometric emissivity evaluation methods in infrared thermometry Accurate radiation thermometry of real objects critically depends on knowledge of surface emissivity, which is rarely known a priori and often varies with surface condition, temperature, and environment. Although theoretical models for spectral emissivity evaluation exist, their practical validation under application-relevant conditions remains limited. In this study, spectral and radiometric emissivity evaluation methods are compared on metallic samples up to 350 ◦C. The spectral method derives effective emissivity from spectroscopy-measured spectral emissivity using instrument-specific spectral sensitivity (responsivity), while the radiometric method evaluates emissivity directly from radiance measurements using a radiation thermometer and a reference contact temperature. The radiometric method is treated as an application-level reference. Stable and homogeneous chromium nitride (CrN)-coated samples show good agreement between the two methods, whereas raw metals and polysiloxane-coated samples highlight practical limitations related to sample surface instability and inhomogeneity. The results demonstrate that spectral emissivity evaluation is valid in practice when its underlying method assumptions are fulfilled, while radiometric evaluation remains preferable for in situ infrared thermometry. radiation thermometry emissivity spectral emissivity effective emissivity emissivity evaluation real-body thermometry sevalna termometrija emisivnost spektralna emisivnost efektivna emisivnost ovrednotenje emisivnosti sevalna termometrija realnih teles true false true Angleški jezik Slovenski jezik Članek v reviji 2026-03-09 09:29:33 2026-03-09 09:29:39 2026-03-10 04:28:30 0000-00-00 00:00:00 2026 0 0 17 str. issue 5, art.1671 Vol. 26 Mar.-1 2026 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.317 1424-8220 10.3390/s26051671 270888707 sensors-26-01671.pdf sensors-26-01671.pdf 1 E24D7F50E31BF0FB9DBDD0C08B2983B6 ca69fc8cad9650ce2fd886efd4724f979bb26ee44b252f44b7f738e398efa47a f4702e89-1b91-11f1-a1ba-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=229759 https://www.mdpi.com/1424-8220/26/5/1671 1 b2bddf72-1b91-11f1-a1ba-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=229758 Fakulteta za elektrotehniko 0 0 0