Influence of thermal radiations in infrared optical systems

Xiao, Xi; Li, Xiaotong; Cen, Zhaofeng

doi:10.1117/12.572763

Cited by 6 publications

(4 citation statements)

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“…Among these factors, the refractive index of optical materials varies most with temperature, followed by the curvature radius of the optical element varies with temperature, and the thickness of the optical element and the spacing between the elements have the least influence [9] .In order to eliminate or reduce the influence of temperature change on the imaging quality, appropriate athermalization technology is adopted in the design process, so that the focal length of the optical system remains unchanged or the change is small in a relatively large temperature range, thereby maintaining good imaging quality [10] .…”

Section: Effect Of Temperature Change On Lens Barrel Materialsmentioning

confidence: 99%

Optical passive athermalization design of a catadioptric infrared optical system with large aperture and long focal length

Cui

Yan

Mei

et al. 2023

Conference on Infrared, Millimeter, Terahertz Waves and Applications (IMT2022)

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In view of the problem that the imaging quality of the large-aperture and long-focal length infrared optical system is sensitive to temperature changes.In this paper,we propose an idea of combining athermalization design with catadioptric optical system,and a large-aperture long-focal length catadioptric infrared optical system is designed by this idea.According to the influence of each parameter by environmental changes,the system optical power is allocated reasonably.Select the appropriate infrared lens material and reflector base material for the system so that the image plane deviation caused by the environmental changes of the components cancel each other out.The design method and idea proposed in this paper have important reference value for the realization of heat dissipation of catadioptric optical system.The working band of the system is 8~14μⅿ,the focal length is 250ⅿⅿ,F-number is 1,and the three infrared materials used in the system are HWS2,HWS9 and IRG22.The design results show that the system can maintain high imaging quality in the temperature range of -40℃~+60℃,with the modulation transfer function(MTF)curves close to the diffraction limit at the cutoff frequency.The design methods and ideas proposed in this paper have significant reference value for realizing athermalization of catadioptric optical systems.

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Section: Effect Of Temperature Change On Lens Barrel Materialsmentioning

confidence: 99%

Optical passive athermalization design of a catadioptric infrared optical system with large aperture and long focal length

Cui

Yan

Mei

et al. 2023

Conference on Infrared, Millimeter, Terahertz Waves and Applications (IMT2022)

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“…Commonly used athermal design methods of optical systems can be divided into active and passive [4,5]. In the active athermal design process, the image plane is actively moved to the optimal imaging position to compensate for the defocus caused by temperature changes.…”

Section: Athermalized Designmentioning

confidence: 99%

Design of detection optical system with large relative aperture

Yang

Wang

et al. 2022

Optical Design and Testing XII

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With the advancement of aerospace technology, space debris generated by the collision and shedding of failed spacecraft is increasing, which threatens the safe operation of spacecraft in orbit seriously, and arouses people's attention to the detection of space debris. To achieve high-performance detection in dark environments, we propose a large relative aperture space-based detection optical system, which has a field of view of 16°, focal length of 182mm, F number of 1.52, and a working wavelength of 450~850nm. The system contains total 11 lenses, making the imaging performance more sensitive to temperature, therefore, we carry out thermal analysis for the system and use optical compensation method to achieve athermalized design. Finally, the system can work in the range of -10°C~+30°C, and the variation of the radius of the spot diagram with temperature is less than 3μm. In addition, we control the influence of stray light in the design process in order to observe bright and dark targets simultaneously. The numerical simulation results demonstrate that the veiling glare index of the system is 2.9%, which meets the requirement of dark object observation. The proposed optical system with large relative aperture and excellent imaging quality could be applied to accurate detection of space debris.

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“…In order to improve the environmental adaptability of the system, the optical system is usually required to maintain good imaging quality in a wide temperature range during the design of the optical and mechanical system. With the change of temperature, the refractive index of the optical materials, the size and the surface shape of the optical elements will change [1], which will cause defocus and other aberrations of the optical system, leading to poor imaging quality. Compared with visible optical materials, infrared optical materials have high refractive index temperature variation coefficient, so the influence of temperature variation on the performance of infrared optical system is more serious [2].…”

Section: Introductionmentioning

confidence: 99%

Thermal environment adaptability design of space-based infrared imaging system

Hu¹,

Shi²,

Jiang³

et al. 2018

IJHT

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This study discusses the influence of temperature on infrared optical system and introduced the principle and method of non-thermal design. Based on the requirements of orbital thermal environment and technical indexes of a space-based infrared imaging system, this study conducts the thermal environment adaptability design of an imaging system. The nonthermal design of the optical system is carried out by combining active and passive methods, and thermal design and thermal analysis are carried out for the thermal environment of space orbit in which the system works. Finally, the final imaging system is validated by the thermal imaging experiment. The experimental results show that the system can eliminate the influence of temperature change on image quality in the temperature range of-20 ~ + 50 ℃, and can adapt to the thermal environment of space orbit. The imaging quality can meet the application requirements under different temperature conditions.

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Influence of thermal radiations in infrared optical systems

Cited by 6 publications

References 0 publications

Optical passive athermalization design of a catadioptric infrared optical system with large aperture and long focal length

Optical passive athermalization design of a catadioptric infrared optical system with large aperture and long focal length

Design of detection optical system with large relative aperture

Thermal environment adaptability design of space-based infrared imaging system

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