Effective radiation mathematical model of air objects taking into account ascending and descending radiation in a cloudless atmosphere in the infrared wavelength range

Nesterov M.S., Afanasyeva E.M., Lopin V.I.

For Russian citation (Opticheskii Zhurnal):

Нестеров М.С., Афанасьева Е.М., Лопин В.И. Математическая модель эффективного излучения воздушных объектов с учётом восходящего и нисходящего излучений в безоблачной атмосфере в инфракрасном диапазоне длин волн // Оптический журнал. 2025. Т. 92. № 4. С. 32–41. http://doi.org/10.17586/1023-5086-2025-92-04-32-41

Nesterov M.S., Afanasieva E.M., Lopin V.I. Effective radiation mathematical model of air objects taking into account ascending and descending radiation in a cloudless atmosphere in the infrared wavelength range [in Russian] // Opticheskii Zhurnal. 2025. V. 92. № 4. P. 32–41. http://doi.org/10.17586/1023-5086-2025-92-04-32-41

For citation (Journal of Optical Technology):

Abstract:

Subject of study. Effective radiation Formation from air objects as a result of complex heat exchange on the surface and transfer of radiation from the atmosphere, the Sun and the earth's surface in the wavelength ranges from 3 to 5 microns and from 8 to 14 microns. Aim of study. Development of effective radiation mathematical model of the of air objects in the wavelength ranges from 3 to 5 microns and from 8 to 14 microns, based on the solution of a three-dimensional problem of complex heat transfer on a surface using the finite volume method using the ANSYS software environment and allowing to take into account the ascending and descending flows of solar radiation and thermal radiation of the cloudless atmosphere. Method. Finding the energy characteristics of effective radiation (own and reflected) of air objects as a result of solving the three-dimensional problem of complex heat exchange on the surface by the finite volume method using the ANSYS software medium and solving the equation of radiation transfer in a cloudless atmosphere in the wavelength range from 3 to 5 microns and from 8 to 14 microns due to the representation of the atmosphere in the form of layers, each of which is characterized by a constant temperature, concentration of water vapors and carbon dioxide. Main results. Effective radiation mathematical model of air objects has been developed, which allows calculating the objects radiation characteristics and taking into account the parameters of objects: the power of internal sources, optical and thermophysical properties of the surface, the object geometry, as well as taking into account the influence of variability of radiation of the atmosphere, the Earth's surface and the Sun at different altitudes during the day and at different times of the year. The maximum deviation of the effective radiation brightness calculated from the simulation results from the effective radiation brightness calculated from the experimental results was 15%. Practical significance. The results obtained in the work can be used to assess the optical visibility of objects, as well as to assess the effectiveness of monitoring tools for airspace, the earth's surface in the infrared wavelength range.

Keywords:

air objects, infrared radiation, modeling of complex heat transfer, radiation transfer in the atmosphere

Acknowledgements:

scientific staff of the Military Educational and Scientific Centre of the Air Force N. E. Zhukovsky and Y. A. Gagarin Air Force Academy, Voronezh

OCIS codes: 260.3060, 260.3090, 280.6780, 010.1320, 010.1300

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