Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Traceable Spectral Radiation Model of Radiation Thermometry

Version 1 : Received: 14 February 2023 / Approved: 16 February 2023 / Online: 16 February 2023 (04:28:36 CET)

A peer-reviewed article of this Preprint also exists.

Mlačnik, V.; Pušnik, I. A Traceable Spectral Radiation Model of Radiation Thermometry. Appl. Sci. 2023, 13, 4973. Mlačnik, V.; Pušnik, I. A Traceable Spectral Radiation Model of Radiation Thermometry. Appl. Sci. 2023, 13, 4973.


Despite great technical capabilities, the theory of non-contact temperature measurement is usually not fully applicable to the use of measuring instruments in practice. While black body calibrations are in practice well established and easy to accomplish, this calibration protocol is never fully applicable to measurements of real objects under real conditions. Currently, the best approximation to real world radiation thermometry is grey body radiation thermometry, which is supported by most measuring instruments to date. Nevertheless, the metrological requirements necessitate traceability, therefore real body radiation thermometry is required for temperature measurements of real bodies. This article documents the current state of temperature calculation algorithms for radiation-thermometers and the creation of a traceable model for radiation thermometry of real bodies that uses a digital twin model of the system of measurement to compensate for the loss of data, caused by spectral integration, which occurs when thermal radiation is absorbed on the active surface of the sensor. To solve this problem, a hybrid model with variable scalar inputs is proposed, in which the scalar input parameters are calculated to correspond to the system of measurement. The method for calculating the effective parameters is proposed and verified with the theoretical model of non-contact thermometry. The sum of effective instrumental parameters is presented for different temperatures to show that the rule of radiation thermometry of grey bodies, according to which the sum of instrumental emissivity and instrumental reflectivity equals to 1, does not hold in radiation thermometry for real bodies. Using the derived models of radiation thermometry, the uncertainty of radiation thermometry due to the uncertainty of spectral emissivity is analysed by simulated measurements along the temperature ranges of various radiation thermometers, enabling traceable non-contact temperature measurements with known measurement uncertainty under any known conditions.


radiation thermometry; non-contact thermometry; model of radiation thermometry; direct model of radiation thermometry; inverse model of radiation thermometry; spectral emissivity; effective emissivity; instrumental emissivity; traceability; radiation thermometry for real objects


Physical Sciences, Applied Physics

Comments (0)

We encourage comments and feedback from a broad range of readers. See criteria for comments and our Diversity statement.

Leave a public comment
Send a private comment to the author(s)
* All users must log in before leaving a comment
Views 0
Downloads 0
Comments 0
Metrics 0

Notify me about updates to this article or when a peer-reviewed version is published.
We use cookies on our website to ensure you get the best experience.
Read more about our cookies here.