Design of Space Coaxial Field-Bias Three-Mirror Optical System with High Resolution

Xiaoxiao, 韦晓孝 Wei; Feng, 许峰 Xu; Jianjun, 余建军 Yu

doi:10.3788/cjl201239.0416002

Cited by 4 publications

(4 citation statements)

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“…The goal of the optical design is to provide a programme for the surveying and mapping sensor which can achieve high resolution. According to the formulas (1), (2) and (3), if the obscuration ratio 1 α is too large, the effective incidence energy will be reduced, the diffractive limit of the modulation transfer function will descend. And if the obscuration ratio α is too small, the difficulty to correct the aberration will be increased, large field of view is hard to be realized especially when the focal length is long.…”

Section: Requirements For the Optical Systemmentioning

confidence: 99%

“…Three-mirror off-axis optics can easily achieve high modulation transfer function and low distortion, but the volume is often huge especially for long focal-length optics [1] . Comparatively, three-mirror-astigmatism optics is of good rotational symmetry, structural compaction, lightweight, thermal stability, rotary inertia and easy to realize integrated design of camera and satellite [2] . But the disadvantages of the three-mirror-astigmatism optics is obvious, the relative distortion is about the magnitude of one present, the absolute distortion is large when long linear array detector is used, past distortion correction is hard.…”

Section: Introductionmentioning

confidence: 99%

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Four-mirror optical system with ultra-low distortion

Tianjin¹

2014

SPIE Proceedings

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Optical systems with long effective focal length and large-aperture will play more important roles in space remote sensor in the future. Coaxis optical systems have been widely adopted due to its advantages including good symmetrical characteristics, compact structure, satisfying volume and rotary inertia. But the distortion of the coaxis three-mirror-anastigmat system is often larger than one percent of the image height and past correction is hard, which is unfavourable especially for surveying and mapping camera. Based on the design ideas and aberration theoretical analysis of Coaxis reflective optics, four-mirror systems with long focal length is presented in this paper, which can achieve high image quality and ultra-low distortion .The forth reflective mirror is set near the exit pupil to correct the aberration related to the pupil, and the processing difficulty of the primary mirror is also lowered. Example of the optical design and image quality forecasting is also given at the end of the paper.

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Section: Requirements For the Optical Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Four-mirror optical system with ultra-low distortion

Tianjin¹

2014

SPIE Proceedings

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“…内，且宽视场下中心遮过大，影响系统分辨率和光能利用率，因此为实现较大视场，一般采用离轴反射结构 [1][2][3][4][5][6] 。传统的离轴三反消像散系统(TMA)一般为线阵成像，难以实现较大相对孔径的面阵成像，且为满足像质需求往往加入高次非球面甚至自由曲面，而在紫外波段下复杂面型反射镜的制造很难满足公差中对粗糙度均方根(RMS)半径的要求 [7][8][9] 。空间光学系统易受太阳、地球、月亮等视场外强杂光光源的影响，其辐射亮度往往比观测目标高出几个数量级 [10] ，为提高系统信噪比，保证在轨空间系统的成像质量和目标分辨能力不受杂光干扰，需对光学系统…”

Section: -unclassified

Optical Design and Stray Light Analysis for Ultraviolet Board Width Off-Axis Four Mirrors Optical System

Zhu¹,

Zhang²,

Wu³

et al. 2015

中国激光

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To satisfy the far ultraviolet space imaging system with super wide field, larger relative aperture, miniaturized size and good stray light suppression, a method based on the inverse focal power allocation theory is applied to calculate the structure of all spherical surface reflective system. The relevant technical parameters of all spherical off-axis optical system include focal length 12 mm, F number 3 and field of view 70°× 10°. Such a design will consider to eliminate stray light of optics and structure, analyze stray light and main sources. The modulation transfer functions (MTF) at the cutoff spatial frequency are larger than 0.7 at all fields and the point sources transmittance (PST) arrives to 4.2 × 10 7 which is far less than 5 × 10 5 when the evadable angle out of the field of view is 10°. Compared to other optical systems, the main advantage of this system is that it can achieve super wide field with compact structures, utilizes all spherical mirrors which largely decrease the cost of fabrication, and presents high level of stray light suppression.

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“…Sketch maps of (a) imaging on continuously scanning and (b) imaging on step scanning and staring [8,[10][11] 。图 5 光学系统布局…”

Section: -mentioning

confidence: 99%

Key Technique of Photoelectric Reconnaissance System for Stratospheric Airship

Fudong¹,

Zhe²,

Feng³

et al. 2014

激光与光电子学进展

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Stratospheric airship works in stratosphere about 20 km above ground. It can cruise or belocated in the air, and has become a good platform for reconnaissance, surveillance or track. Photoelectric system is an important equipment on the stratospheric airship. The advantage of remote sensing on stratospheric platform is introduced, especially on detectable distance. The components and principle are introduced according to the typical existing photoelectric systems. Furthermore, the key technique of photoelectric system for stratospheric airship is analyzed, and the design method is explained. This paper can be referenced for the design of such systems in the future.

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Design of Space Coaxial Field-Bias Three-Mirror Optical System with High Resolution

Cited by 4 publications

References 0 publications

Four-mirror optical system with ultra-low distortion

Four-mirror optical system with ultra-low distortion

Optical Design and Stray Light Analysis for Ultraviolet Board Width Off-Axis Four Mirrors Optical System

Key Technique of Photoelectric Reconnaissance System for Stratospheric Airship

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