Lens Design for Optical System of High Zoom Ratio

Lun, 江伦 Jiang; Wei, 黄玮 Huang

doi:10.3788/aos201131.1222006

Cited by 2 publications

(1 citation statement)

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“…L Jiang introduced a high zoom-ration zoom optical system. In this system, two lenses were used to compensate for the temperature error, but not introduced how to select the lens for temperature compensation (Jiang and Huang, 2011). J Li introduced a nonuniformity correction method based on radiation calibration, which can be used in a three-lens polarizing CCD camera.…”

Section: Introductionmentioning

confidence: 99%

Error analysis and optimal design of reduction relay lens for field of view stitching applications

Zhang

Kong

et al. 2021

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Purpose FOV splicing optical remote sensing instruments have a strict requirement for the focal length consistency of the lens. In conventional optical-mechanical structure design, each optical element is equally distributed with high accuracy and everyone must have a high machining and assembly accuracy. For optical remote sensors with a large number of optical elements, this design brings great difficulties to lens manufacture and alignment. Design/methodology/approach Taking the relay lens in an optical remote sensing instrument with the field of view splicing as an example, errors of the system are redistributed to optical elements. Two optical elements, which have the greatest influence on modulation transfer function (MTF) of the system are mounted with high accuracy centering and the other elements are fixed by gland ring with common machining accuracy. The reduction ratio consistency difference among lenses is compensated by adjusting the optical spacing between the two elements. Findings Based on optical system simulation analysis, the optimized structure can compensate for the difference of reduction ratio among lens by grinding the washer thickness in the range of ±0.37 mm. The test data for the image quality of the lens show that the MTF value declined 0.043 within ±0.4 mm of space change between two barrels. The results indicate that the reduction ratio can be corrected by adjusting the washer thickness and the image quality will not obviously decline. Originality/value This paper confirms that this work is original and has not been published elsewhere nor is it currently under consideration for publication elsewhere. In this paper, the optimum structural design of the reduction relay lens for the field of view stitching applications is reported. The method of adjusting washer thickness is applied to compensate for the reduction ratio consistency difference of lenses. The optimized structure also greatly reduces the difficulty of lenses manufacture, alignment and improves the efficiency of assembly.

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Section: Introductionmentioning

confidence: 99%

Error analysis and optimal design of reduction relay lens for field of view stitching applications

Zhang

Kong

et al. 2021

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基于Alvarez透镜的紧凑型红外连续变倍系统设计

Ouyang Qi,

Liu Mengyao,

Ning Yan

et al. 2024

激光与光电子学进展

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In this study, a transverse moving infrared optical continuous zoom system based on the Alvarez lens is proposed to address the challenges associated with the complex structure and large volume of traditional axialmoving mechanical optical zoom systems. The system consists of two sets of Alvarez lenses, apertures, focusing lenses, and infrared detectors. Herein, two sets of Alvarez lenses adopt a Keplertype telescope structure, where the first set of Alvarez lenses functions as the zoom group and the second set of Alvarez lenses serves as the compensation group. The infinitely far incident light passes through two sets of Alvarez lenses and exits, the emitted parallel light is then focused and imaged onto the target surface of the infrared detector through a fixed focal lens. Utilizing Zemax software for optical simulation, our designed optical zoom system covers the 8-12 μm long wave infrared band, with a maximum field of view angle of 6°, a maximum pupil diameter of 6 mm, an Fnumber of 2, distortion of <2. 1%, and a total optical length of ~74 mm. The Alvarez lens only requires to be horizontally moved by ~1 mm to achieve continuous optical magnification from 5× to 15× . Moreover, the modulation transfer function of the proposed optical zoom system can attain up to 0. 5@17 lp/mm, assuming a resolution of 320×240 and pixel sizes of 30 μm for the infrared detector. The simulation results indicate that the system has the advantages of high magnification, a compact structure, and high imaging quality, making it a promising candidate for applications in the field of miniaturized infrared zoom imaging.

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Lens Design for Optical System of High Zoom Ratio

Cited by 2 publications

References 0 publications

Error analysis and optimal design of reduction relay lens for field of view stitching applications

Error analysis and optimal design of reduction relay lens for field of view stitching applications

基于Alvarez透镜的紧凑型红外连续变倍系统设计

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