Improving the accuracy of temperature measurement by a spectral ratio pyrometer

• Published in: Thermophysics and aeromechanics 2023-05, Vol.30 (3), p.581-588
• Main Author: Frunze, A. V.
• Format: Article
• Language: English
• Subjects: Algorithms; Broadband; Dependence; Mathematical analysis; Narrowband; Numerical methods; Physics; Physics and Astronomy; Pyrometers; Spectral emissivity; Temperature dependence; Temperature measurement; Thermodynamics
• ISSN: 1531-8699; 0869-8643; 1531-8699
• DOI: 10.1134/S0869864323030162

The paper describes an algorithm that using numerical methods allows calculating the relationship between the temperature of the spectral ratio and the actual temperature of a “non-gray” object, which takes into account not only the dependence of the spectral emissivity of the object on the wavelength, but also its temperature dependence, inherent in almost all real objects (materials). This algorithm is applicable to any pyrometers of spectral ratio: narrowband and broadband ones. Previously, the specified problem had no solution which would simultaneously consider both dependences neither in domestic nor in foreign literature. The proposed solution is based on a well-known algorithm that allows calculating the relationship between the temperature of the spectral ratio and the actual temperature of a “non-gray” object, taking account only the dependence of the spectral emissivity of the object on the wavelength. The presented algorithm has been modified to consider its temperature dependence as well. An example of the implementation of the described algorithm is presented.