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<p>We consider the problems of calibration and verification of the serviceability of the scientific equipment planned for launching and using in the “Sun-Terahertz” spaceborne experiments. A&#xa0;blackbody simulator has been developed for ground testing of this scientific equipment. A&#xa0;method for calibration of blackbody simulators is proposed. The results of calibration of the blackbody simulator under the ground conditions are required to assess the level of signals of the receivers of scientific equipment obtained in measuring the radiation fluxes from the Sun in the course of experiments carried out on board of the International Space Station moving along the low-Earth orbit. Both ground tests and verification of the proposed methodology were performed by using a&#xa0;single-channel model of the scientific equipment. The blackbody simulator makes it possible to direct the radiation flux into the telescopes of the scientific equipment for various given temperatures of the radiator. For monitoring of the brightness temperature of the blackbody simulator, we use a&#xa0;thermal imager based on an MLX90640 infrared camera. The proposed procedure makes it possible to estimate the factors affecting the operation of the scientific equipment, such as the temperature gradient between the surface of the parabolic mirror of the emitter of blackbody simulator and the point of mounting of the thermocouple, the temperature gradient between the center of the emitting surface of the blackbody simulator and its edge, and the divergence of the radiation beam of blackbody simulator. The spectral transmission coefficient of the air medium in the optical channel is also found (from the emitter of the blackbody simulator to the input window of the receiver of scientific equipment). Based on the results of experimental verification, we make conclusions concerning the actual radiation fluxes coming to the receivers of scientific equipment from the blackbody simulator in the course of calibrations depending on the temperature specified on the meter controller. The accumulated results can be used by the researchers involved in thermophysical measurements performed by using spectrometric scientific instruments based on the optoacoustic transducers (Golay cells) and other sensitive elements.</p>

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Method for calibration of the blackbody simulator: determination of temperature corrections based on the thermal imaging measurements and computed flow conversion rates

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • M. V. Philippov

摘要

We consider the problems of calibration and verification of the serviceability of the scientific equipment planned for launching and using in the “Sun-Terahertz” spaceborne experiments. A blackbody simulator has been developed for ground testing of this scientific equipment. A method for calibration of blackbody simulators is proposed. The results of calibration of the blackbody simulator under the ground conditions are required to assess the level of signals of the receivers of scientific equipment obtained in measuring the radiation fluxes from the Sun in the course of experiments carried out on board of the International Space Station moving along the low-Earth orbit. Both ground tests and verification of the proposed methodology were performed by using a single-channel model of the scientific equipment. The blackbody simulator makes it possible to direct the radiation flux into the telescopes of the scientific equipment for various given temperatures of the radiator. For monitoring of the brightness temperature of the blackbody simulator, we use a thermal imager based on an MLX90640 infrared camera. The proposed procedure makes it possible to estimate the factors affecting the operation of the scientific equipment, such as the temperature gradient between the surface of the parabolic mirror of the emitter of blackbody simulator and the point of mounting of the thermocouple, the temperature gradient between the center of the emitting surface of the blackbody simulator and its edge, and the divergence of the radiation beam of blackbody simulator. The spectral transmission coefficient of the air medium in the optical channel is also found (from the emitter of the blackbody simulator to the input window of the receiver of scientific equipment). Based on the results of experimental verification, we make conclusions concerning the actual radiation fluxes coming to the receivers of scientific equipment from the blackbody simulator in the course of calibrations depending on the temperature specified on the meter controller. The accumulated results can be used by the researchers involved in thermophysical measurements performed by using spectrometric scientific instruments based on the optoacoustic transducers (Golay cells) and other sensitive elements.