A catadioptric infrared dual band optically passive athermal optical system

Bai, Yu; Xing, Tingwen; Jiang, Yadong

doi:10.1007/s10043-017-0323-1

Cited by 5 publications

(2 citation statements)

References 17 publications

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“…Optical passive athermal technology is based on the change in the refractive index of lens materials and the expansion or contraction of optical elements and housing materials [ 17 , 18 , 19 ]. Considering the materials of the mirror and the housing, Qiuzhen Xu analyzed the thermal difference of the classical Cassegrain system and pointed out that when the thermal expansion coefficients of the mirror and the housing material are the same, the thermal difference is always zero [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Achromatic and Athermal Design of Aerial Catadioptric Optical Systems by Efficient Optimization of Materials

Ding

Liu

et al. 2023

Sensors

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The remote sensing imaging requirements of aerial cameras require their optical system to have wide temperature adaptability. Based on the optical passive athermal technology, the expression of thermal power offset of a single lens in the catadioptric optical system is first derived, and then a mathematical model for efficient optimization of materials is established; finally, the mechanical material combination (mirror and housing material) is optimized according to the comprehensive weight of offset with temperature change and the position change of the equivalent single lens, and achieve optimization of the lens material on an athermal map. In order to verify the effectiveness of the method, an example of a catadioptric aerial optical system with a focal length of 350 mm is designed. The results show that in the temperature range of −40 ℃ to 60 ℃, the diffraction-limited MTF of the designed optical system is 0.59 (at 68 lp/mm), the MTF of each field of view is greater than 0.39, and the thermal defocus is less than 0.004 mm, which is within one time of the focal depth, indicating that the imaging quality of the optical system basically does not change with temperature, meeting the stringent application requirements of the aerial camera.

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Section: Introductionmentioning

confidence: 99%

Achromatic and Athermal Design of Aerial Catadioptric Optical Systems by Efficient Optimization of Materials

Ding

Liu

et al. 2023

Sensors

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“…In order to efficiently collect infrared signals and eliminate chromatic aberrations, the traditional optical system of a thermal imager consists of multiple infrared lenses with uniform refractive index (n) and certain surface curvatures. 7 In an effort to reduce the volume and weight of the infrared optical system, the researchers have attempted to fabricate infrared graded-index (GRIN) lenses for replacing the index-uniform ones. 8,9 The GRIN lens is characterized by the gradient change of the refractive index in the axial, radial or spherical direction.…”

Section: Introductionmentioning

confidence: 99%

Thermally matched chalcogenide glasses with high refractive index contrast for infrared graded‐index lenses

Chen,

Yang,

et al. 2023

Int J of Appl Glass Sci

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Infrared graded‐index (GRIN) lenses are desirable for realizing miniaturization and lightweight of infrared imaging systems. Chalcogenide glasses have excellent infrared transparency, good rheological property, and large refractive index range, making them preferred materials for infrared GRIN lenses. In this work, aiming to find thermally matched chalcogenide compositions with high refractive index contrast for preparing GRIN glasses by the stacking diffusion approach, we investigated characteristic temperature, thermal expansion coefficient and refractive index of Ge‐As‐Se and Ge‐As‐Se‐Te glasses, optimized the glass compositions, and evaluated the feasibility of preparing GRIN glass using the optimized chalcogenide glass powders. It is found that Ge20As20Se20Te40 and Ge12As22Se66 glasses have similar softening temperature (247°C vs. 249°C), reasonably difference of thermal expansion coefficient (3.8 ppm/K), and large refractive index contrast (∼.48). The glass powders with composition xGe20As20Se20Te40‐(1‐x) Ge12As22Se66 can be hot‐pressed into glass disks with good transmittance at the same temperature and pressure. Graded refractive index profile is formed near the interface between the layers after the co‐pressed glass is thermally treated. These results demonstrate the prospect of the compositions for preparing infrared GRIN glasses.

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Optical design and fabrication of a common-aperture multispectral imaging system for integrated deep space navigation and detection

Cao

Chang

Huang

et al. 2023

Optics and Lasers in Engineering

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A catadioptric infrared dual band optically passive athermal optical system

Cited by 5 publications

References 17 publications

Achromatic and Athermal Design of Aerial Catadioptric Optical Systems by Efficient Optimization of Materials

Achromatic and Athermal Design of Aerial Catadioptric Optical Systems by Efficient Optimization of Materials

Thermally matched chalcogenide glasses with high refractive index contrast for infrared graded‐index lenses

Optical design and fabrication of a common-aperture multispectral imaging system for integrated deep space navigation and detection

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