Evaluation of the size-of-source effect in thermal imaging cameras

Pušnik, Igor (avtor), Geršak, Gregor (avtor)

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.

• Jezik: Angleški jezik
• Ključne besede: temperature, thermal imaging camera, accuracy, size-of-source effect, SSE, region of interest, ROI
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FE - Fakulteta za elektrotehniko
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2021
• Št. strani: 22 str.
• Številčenje: Vol. 21, iss. 2, art. 607
• PID: 20.500.12556/RUL-134901
• UDK: 621.317
• ISSN pri članku: 1424-8220
• DOI: 10.3390/s21020607
• COBISS.SI-ID: 47911683
• Datum objave v RUL: 10.02.2022

Gradivo je del revije

• Naslov: Sensors
• Skrajšan naslov: Sensors
• Založnik: MDPI
• ISSN: 1424-8220
• COBISS.SI-ID: 10176278

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.
• Začetek licenciranja: 16.01.2021

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: temperatura, termovizijske kamere, točnost, učinek velikosti vira, SSE, področje zanimanja, ROI

Projekti

• Financer: ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
• Številka projekta: P2-0225
• Naslov: Metrologija in kakovost

• Financer: Drugi - Drug financer ali več financerjev
• Program financ.: Republic of Slovenia, Ministry of Economic Development and Technology, Metrology Institute
• Številka projekta: 6401-18/2008/70