Multispectral High Temperature Thermography
Wójcik W. Firago V. Smolarz A. Shedreyeva I. Yeraliyeva B.
February-1 2022MDPI
Sensors
2022#22Issue 3
The paper considers the issues of creating high-temperature digital thermographs based on RGB photodetector arrays. It has been shown that increasing the reliability of temperature measurement of bodies with unknown spectral coefficient of thermal radiation can be ensured by optimal selection of the used spectral range and registration of the observed thermal radiation fields in three spectral ranges. The registration of thermal radiation in four or more spectral ranges was found to be inefficient due to the increasing error in temperature determination. This paper presents a method for forming three overlapping spectral regions in the NIR spectral range, which is based on the use of an external spectral filter and a combination of the spectral characteristics of an RGB photodetector array. It is shown that it is necessary to ensure the stability of the solution of the system of three nonlinear equations with respect to the influence of noise. For this purpose, the use of a priori information about the slope factor of the spectral dependence of the thermal radiation coefficient in the selected spectral range for the controlled bodies is proposed. The theoretical results are confirmed by examples of their application in a thermograph based on an array of CMOS RGB photodetectors.
High-temperature thermal imaging , Pyrometry methods , RGB matrices , Temperature measurement , Thermal radiation coefficient , Thermography
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Department of Electronics and Information Technology, Faculty of Electrical Engineering and Computer Science, Lublin University of Technology, Nadbystrzycka 38d, Lublin, 20-618, Poland
Department of Quantum Radiophysics and Optoelectronics, Belarusian State University, 4 Nezavisimosti Avenue, Minsk, 220030, Belarus
Faculty of Information Technology, M.Kh.Dulaty Taraz Regional University, Tole Bi St 40, Taraz, 080000, Kazakhstan
Department of Electronics and Information Technology
Department of Quantum Radiophysics and Optoelectronics
Faculty of Information Technology
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