Relationship analysis between transient thermal control mode and image quality for an aerial camera

Liu, Weiyi; Yu, Xu; Yuan, Yifei; Xu, Yulei; Shen, Honghai; Ding, Yalin

doi:10.1364/ao.56.001028

Cited by 9 publications

(3 citation statements)

References 13 publications

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“…Optical aberration analysis can be completed by fitting the distorted surface using Zernike polynomials [ 8 ]. Reference [ 9 ] analyzed the aberration and image quality under given temperature conditions. Based on the simulation results, the temperature level and allowable temperature differences that the opto-mechanical structure need to maintain were provided.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Thermal Control Design for Aerial Reflective Opto-Mechanical Structure

Wang,

Zhou,

Jiang

et al. 2024

Sensors

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To improve the adaptability of aerial reflective opto-mechanical structures (mainly including the primary mirror and secondary mirror) to low-temperature environments, typically below −40 °C, an optimized thermal control design, which includes passive insulation and temperature-negative feedback-variable power zone active heating, is proposed. Firstly, the relationship between conventional heating methods and the axial/radial temperature differences of mirrors with different shapes is analyzed. Based on the heat transfer analyses, it is pointed out that optimized thermal control design is necessary to ensure the temperature uniformity of the fused silica mirror, taking into account the temperature level when the aerial electro-optics system is working in low-temperature environments. By adjusting the input voltage based on the measured temperature, the heating power of the subregion is changed accordingly, so as to locally increase or decrease the temperature of the mirrors. The thermal control scheme ensures that the average temperature of the mirror fluctuates slowly and slightly around 20 °C. At the same time, the temperature differences within a mirror and between the primary mirror and the secondary mirror can be controlled within 5 °C. Thereby, the resolution of EO decreases by no more than 11.4%.

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Section: Introductionmentioning

confidence: 99%

Optimization of Thermal Control Design for Aerial Reflective Opto-Mechanical Structure

Wang,

Zhou,

Jiang

et al. 2024

Sensors

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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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“…An integrated optomechanical analysis (IOA) can comprehensively evaluate the impact of external environmental factors at the design stage, and it guides the design optimization of optomechanical structures using the analysis's results, thereby significantly improving the adaptability of special optical instruments to the environment, such as aerial cameras, star sensors, space telescopes, etc. [5][6][7]. Currently, there are two main common simulation analysis methods: (1) in the traditional simulation analysis, the optomechanical system is simulated and optimized in each design process; (2) in the IOA, the overall optimization and design of the optomechanical system are carried out.…”

Section: Introductionmentioning

confidence: 99%

A Review on Zernike Coefficient-Solving Algorithms (CSAs) Used for Integrated Optomechanical Analysis (IOA)

Pan

Zhang

et al. 2023

Photonics

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An integrated optomechanical analysis (IOA) can predict the response of an optomechanical system to temperature, gravity, vibrations, and other local loadings; thus, the normal operation of instruments under special conditions is guaranteed. Zernike polynomials are the most popular for fitting the IOA-derived mechanical deformation data. By solving the Zernike coefficients of all deformed optical surfaces, the relationship between aberrations and deformations can be further revealed. The process of IOA is summarized in this article. The principles of four primary Zernike coefficient-solving algorithms (CSAs) were expounded, and the corresponding applications are reviewed in detail, including the least squares method, the Gram–Schmidt orthogonalized method, the Householder transformation, and singular value decomposition (SVD). Artificial neural networks (ANNs) trained for solving a similar overdetermined set of equations are also discussed; an innovative Zernike CSA based on a one-dimensional convolutional neural network (1D-CNN) was proposed, emphasizing its potential for Zernike CSA. The feasibility of the neural network method was verified by conducting experiments on the primary mirror of the front reflection system of a space camera. This review can provide references for the precise optimization of IOA.

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Relationship analysis between transient thermal control mode and image quality for an aerial camera

Cited by 9 publications

References 13 publications

Optimization of Thermal Control Design for Aerial Reflective Opto-Mechanical Structure

Optimization of Thermal Control Design for Aerial Reflective Opto-Mechanical Structure

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

A Review on Zernike Coefficient-Solving Algorithms (CSAs) Used for Integrated Optomechanical Analysis (IOA)

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