Influence of atmosphere on calibration of radiation thermometers
ID Mlačnik, Vid (Author), ID Pušnik, Igor (Author)

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Current process of calibrating radiation thermometers, including thermal imagers, relies on measurement comparison with the temperature of a black body at a set distance. Over time, errors have been detected in calibrations of some radiation thermometers, which were correlated with moisture levels. In this study, effects of atmospheric air on thermal transmission were evaluated by the means of simulations using best available resources of the corresponding datasets. Sources of spectral transmissivity of air were listed, and transmissivity data was obtained from the HITRAN molecular absorption database. Transmissivity data of molecular species was compiled for usual atmospheric composition, including naturally occurring isotopologs. Final influence of spectral transmissivity was evaluated for spectral sensitivities of radiation thermometers in use, and total transmissivity and expected errors were presented for variable humidity and measured temperature. Results reveal that spectral range of measurements greatly influences susceptibility of instruments to atmospheric interference. In particular, great influence on measurements is evident for the high-temperature radiation pyrometer in the spectral range of 2–2.7 µm, which is in use in our laboratory as a traceable reference for high-temperature calibrations. Regarding the calibration process, a requirement arose for matching the humidity parameters during the temperature reference transfer to the lower tiers in the chain of traceability. Narrowing of the permitted range of humidity during the calibration, monitoring, and listing of atmospheric parameters in calibration certificates is necessary, for at least this thermometer and possibly for other thermometers as well.

Keywords:transmissivity of air, radiation thermometer, calibration, measurement errors, measurement uncertainty, moisture, humidity, infrared thermometers
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FE - Faculty of Electrical Engineering
Publication status:Published
Publication version:Version of Record
Number of pages:13 str.
Numbering:Vol. 21, iss. 16, art. 5509
PID:20.500.12556/RUL-136093 This link opens in a new window
ISSN on article:1424-8220
DOI:10.3390/s21165509 This link opens in a new window
COBISS.SI-ID:74176771 This link opens in a new window
Publication date in RUL:12.04.2022
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Record is a part of a journal

Shortened title:Sensors
COBISS.SI-ID:10176278 This link opens in a new window


License:CC BY 4.0, Creative Commons Attribution 4.0 International
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:16.08.2021

Secondary language

Keywords:transmisivnost zraka, sevalni termometri, kalibracija, merilne napake, merilna negotovost, zračna vlaga, infrardeči termometri


Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Project number:P2-0225
Name:Metrologija in kakovost

Funder:Drugi - Drug financer ali več financerjev
Funding programme:Republic of Slovenia, Ministry of Economic Development and Technology, Metrology Institute
Project number:6401-18/2008/70

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