20.500.12556/RUL-134901 Evaluation of the size-of-source effect in thermal imaging cameras In numerous applications, including current body temperature monitoring in viral pandemic management, thermal imaging cameras are used for quantitative measurements. These require determination of the measurement accuracy (error) and its traceability (measurement uncertainty). Within error estimation, the size-of-source effect (SSE) is an important error source. The SSE is the relation between the physical size of a target and the instrument’s nominal target size. This study presents a direct evaluation of the error due to the SSE. A stable and uniform temperature, generated by blackbodies, was measured by a high-quality thermal imager. To limit the generated radiation, custom-made blocking tiles with different apertures were used. Effects of aperture shapes and positions, camera-target distances and temperature levels on the error were investigated. The study findings suggest that due to the SSE the measured temperatures are too low, especially at longer camera-target distances. The SSE error depends on the number of pixels available and included into the region of interest, for which the accurate measurement is about to be performed. For an accurate temperature measurement, an array of at least 10 × 10 pixels should be exposed to the observed target radiation, while 3 × 3 central pixel area should be included in the temperature calculation. temperature thermal imaging camera accuracy size-of-source effect SSE region of interest ROI temperatura termovizijske kamere točnost učinek velikosti vira SSE področje zanimanja ROI true false true Angleški jezik Slovenski jezik Članek v reviji 2022-02-10 14:50:17 2022-02-10 14:50:17 2022-09-14 04:10:35 0000-00-00 00:00:00 2021 0 0 22 str. iss. 2, art. 607 Vol. 21 Jan. 2021 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.317 1424-8220 10.3390/s21020607 47911683 RAZ_Pusnik_Igor_2021.pdf RAZ_Pusnik_Igor_2021.pdf 1 35E544CD2E6633C4C57AA4AB94AFF29A bcf4f96519f1cfbf5a3988f6ebb458127af8e61c8a7e75105851e95e0d928f63 5f14e53e-8a78-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=153641 https://www.mdpi.com/1424-8220/21/2/607 1 265fa301-8a78-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=153640 Fakulteta za elektrotehniko 0 0 0