Design of a Low F-number Compact Athermalizing Infrared Optical System

Hemeng, 曲贺盟 Qu; Xin, 张鑫 Zhang; Lingjie, 王灵杰 Wang; Jizhen, 张继真 Zhang

doi:10.3788/aos201232.0322003

Cited by 3 publications

(3 citation statements)

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“…The change of refractive index will affect the change of focal power of lens elements.Compared with visible light materials, the temperature refractive index of infrared materials is much larger [5] . For example, the refractive index temperature coefficient of single crystal germanium is 80 times that of K9 [6] .Therefore, the change of refractive index of materials caused by temperature is a very important factor in infrared system [7] .…”

Section: Effect Of Temperature On Refractive Index Of Optical 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 On Refractive Index Of Optical 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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show abstract

“…So temperature changes have a huge impact on image quality of infrared optical system. When the refractive index of optical materials is changing, light optical path will also change [8] . The athermalized design method of optical system With the purpose of eliminating and reducing the image quality of optical system change caused by temperature effect, athermalized design method has been adopted.…”

Section: The Influence Of the Temperature Changes For The Optical Systemmentioning

confidence: 99%

“…But it requires the electronic control equipment. The size and weight of the system are increased [8] . The method of optical passive compensation makes the image quality of the system remained stable in the working temperature range by reasonable choice of the glass material and rational allocation of each lens focal power.…”

Section: The Influence Of the Temperature Changes For The Optical Systemmentioning

confidence: 99%

Design of Athermalized Infrared Telephoto Lens

Zhang

Shang

et al. 2013

KEM

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IR optical system is much more appropriate to be applied in cluttered and formidable conditions. The change of temperature could degrade image quality of the infrared optical system. So the athermalization becomes the difficult part and key factor in the designing of MWIR optical systems for working under temperature range of -40°C~60°C. In this paper, the infrared telephoto lens is designed; it meets the designing requirements and has good image quality. The effective focal length is 240mm and the F-number is 2.The full field of view is 3.2°. In order to balance the chromatic aberration, an aspherical surface is used in the athermalized infrared optical system. Through carefully selected optical material and reasonable optical power distribution, passive optical athermalization can be realized. The curve of MTF is close to diffraction limit. Within the working temperature, the value of MTF at 30cy/mm is always large than 0.6. The results show that the modulation transfer function (MTF) of optical system in all field of view approaches the diffraction limit at different temperature, and 80% energy concentrates in 1 pixel.

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Design and analysis for the front imaging optical system of the spatiotemporal mixed modulated Fourier transform imaging spectrometer

Wang¹,

Liang²,

Liang³

et al. 2014

Acta Phys. Sin.

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In order to satisfy the application requirements of the large flux and the high stability for the infrared imaging spectrometer, we propose a new type of static no-slit spatiotemporally mixed modulated Fourier transform imaging spectrometer based on the multi-level micro-mirrors. The working process and the generation manner of optical path difference of the system are analyzed. The front imaging system, as an important component of the imaging spectrometer, determines the distribution of the optical path difference, and its performance directly affects the image quality of target object. According to the generation manner of optical path difference of the system, the front imaging system for the telecentric structure in the image space is analyzed and designed. The athermalization design research is carried out by means of the passive optical elimination thermal difference. The result shows that the modulation transfer function curve of each field reaches the diffraction limit in a temperature range of -20-60 ℃. The front imaging optical system has a good imaging quality in the total step height of the multi-step micro-mirrors. At different temperatures, the maximum incident angle on the image surface is less than 0.02° for the principal ray of each field.

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Design of a Low F-number Compact Athermalizing Infrared Optical System

Cited by 3 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 Athermalized Infrared Telephoto Lens

Design and analysis for the front imaging optical system of the spatiotemporal mixed modulated Fourier transform imaging spectrometer

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