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Modified spectral ratio method for distant measurement of temperature distribution by multispectral video cameras
K.M. Bulatov 1, P.V. Zinin 1, N.A. Khramov 1

1 Scientific-Technological Сenter of Unique Instrumentation of the Russian Academy of Sciences,
117342, Moscow, Russia, Butlerova st. 15

 PDF, 1688 kB

DOI: 10.18287/2412-6179-CO-1432

Pages: 151-158.

Full text of article: Russian language.

Abstract:
This paper describes a new method for remote measurements of the temperature distribution without knowledge of the emissivity using multispectral cameras. It is shown that the application of the spectral coupling method in tandem with a multispectral lamp in its standard form is impossible, and modification is required. It is shown that the types of curves representing the sum of two logarithms are given by the form of further spectral relations. The method of switching on a multispectral camera based on reference temperature radiation for working with spectral parameters is shown. The paper analyzes the application of a modified method of spectral ratio pyrometry. It is shown that this method makes it possible to determine the temperature distribution of a sample in real time. The advantages of the modified spectral coupling method based on data from a multispectral camera are: high accuracy (~5%) and speed of temperature distribution measurement.

Keywords:
remote temperature measurement, remote temperature measurement errors, least squares method, multispectral camera.

Citation:
Bulatov KM, Zinin PV, Khramov NA. Modified spectral ratio method for distant measurement of temperature distribution by multispectral video cameras. Computer Optics 2025; 49(1): 151-158. DOI: 10.18287/2412-6179-CO-1432.

Acknowledgements:
The study was funded under a state project of the Scientific and Technological Center for Unique Instrumentation of the Russian Academy of Sciences “Development of new methods and tools for studying the behavior of matter under conditions of high pressures and temperatures” (FFNS-2022-0008). Spectral characteristics of the films were measured on a unique scientific setup "Laser heating in high-pressure cells" at the Scientific and Technical Center of the UP RAS [http://ckp-rf.ru/usu/507563/].

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