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DOI: 10.17586/1023-5086-2024-91-01-66-79
УДК: 771.351.76
Afocal corrector for expanding the operating spectral and temperature ranges of an infrared system: Design methodology and achieved optical performance
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Publication in Journal of Optical Technology
Грейсух Г.И., Левин И.А., Казин С.В. Афокальный корректор для расширения рабочих спектрального и температурного диапазонов инфракрасной системы: расчет и достигнутые характеристики // Оптический журнал. 2024. Т. 91. № 1. С. 66–79. http://doi.org/10.17586/1023-5086-2024-91-01-66-79
Greisukh G.I., Levin I.A., Kazin S.V. Afocal corrector for expanding the operating spectral and temperature ranges of an infrared system: Design methodology and achieved optical performance [in Russian] // Opticheskii Zhurnal. 2024. V. 91. № 1. P. 66–79. http://doi.org/10.17586/1023-5086-2024-91-01-66-79
Grigory I. Greisukh, Il’ya A. Levin, and Sergey V. Kazin, "Afocal corrector for expanding the operating spectral and temperature ranges of an infrared system: design methodology and achieved optical performance," Journal of Optical Technology. 91(1), 40-47 (2024). https://doi.org/10.1364/JOT.91.000040
Subject of the study. An afocal (refractive or refractive-diffractive) corrector, the inclusion of which in the optical channel of a modernized thermal imaging device allows expanding its functionality. Purpose of the study. To present a design methodology for afocal corrector that expands the operating spectral and temperature ranges of a thermal imaging device while maintaining the optical scheme and mechanical structure of its objective. The effectiveness of the methodology is confirmed by the achieved optical performance. Research method. Theoretical analysis and mathematical modeling using the equations of geometric optics and the rigorous theory of diffraction. Main results. A methodology has been developed for obtaining the initial parameters of an afocal corrector, which, along with the elimination of thermal defocusing, allows expanding the working spectral range while maintaining the aplanatic nature of the optical channel. The effectiveness of the proposed methodology is demonstrated by the example of calculating an afocal corrector coupled with an objective originally designed to operate at a fixed temperature and only with long-wavelength (7–14 µm) infrared radiation. It is shown that in the operating temperature range from –40 to 60 °C the system "Afocal refractive-diffraction corrector — original objective" is capable of forming an image in a double spectral range, including medium- (3,4–5,2 µm) and long-wavelength (7,5–11,4 µm) infrared radiation, with a contrast exceeding the image contrast, formed by the original objective at a fixed temperature and only in the long wavelength range. It is also shown that if the expansion of the spectral range is not required, then an afocal corrector consisting of only two refractive lenses successfully copes with the task. Practical significance. The results of this paper open up the possibility of varying the versions of the thermal imaging device without changing the optical scheme of its objective and without making significant adjustments to the elements of the mechanical structure.
infrared objective, afocal corrector, passive optical athermalization, two-layer diffractive microstructure
Acknowledgements:the research was supported by a grant from the Russian Science Foundation (project № 20-19-00081).
OCIS codes: 110.0110, 220.0220
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