Optical Design of the Uncoaxial ThreeMirror System with Wide Field of View

Yongxiang, 郭永祥 Guo; Yingcai, 李英才 Li; Tianmei, 梁天梅 Liang; Qinfang, 陈钦芳 Chen

doi:10.3788/aos20103009.2680

Cited by 4 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…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

View full text Add to dashboard Cite

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.

show abstract

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

View full text Add to dashboard Cite

show abstract

“…性，在工程上使用并不普遍。将图像检测法引入桥梁检测领域是近年来的重点研究方向 [7][8] ，常用的有近距离采集图像法和远程视频检测两种方法。近距离检测需要将摄像头通过工程车或爬升机器人带到拉索表面进行图像采集 [5] ，检测速度较慢，效率低，且牵引机的轮子会损伤拉索表面。远程视频检测需要有高分辨率的摄远物镜来获取拉索表面裂纹图像，目前只有法国司态结构监测公司的 Scansites 远程检测系统在实际工程中使用(http://www.sites-china.com.cn)，但是成本较高。近年来国内对于摄远成像光学系统的设计研究比较多，但主要偏向于航空航天领域中反射式或红外光学系统的研究 [9][10][11][12][13]…”

Section: -unclassified

Optical System Design of High Definition Video Telephoto Objective and Its Imaging Experiment

Xingyu¹,

Daoyin²,

Yue³

et al. 2014

激光与光电子学进展

View full text Add to dashboard Cite

In order to satisfy the remote detection requirements for the surface defects on the cables of cable stayed bridges, an opto-mechanical system of a high definition video telephoto objective is designed and manufactured. According to the objective definition requirement of 4 mm at the distance of 300 m, the imaging definition of 234 cycle/mm with a focal length of 320 mm is determined. A proper initial configuration is chosen, and then some optimization procedures are carried out with the optics design program OSLO, including the focus zooming, glass exchanging, lens reduction, etc. Finally an optical configuration of the telephoto objective is obtained with the relative aperture of 1/5.7, the field angle of 2 ω =1.379°, and the definition of 250 cycle/mm. The opto-mechanical structures are designed rationally and the experimental objective is manufactured. The definition testifies that its actual objective definition reaches 4 mm at the distance of 300 m. The site imaging experiment results at the location of a cable stayed bridge show that this system satisfies the remote detection requirements for the surface defects on the real engineering structures.

show abstract

“…In recent years this system has been applied in space camera, imaging spectrometer, and other areas of the space of imaging observation [1][2][3]. Off-axis three-mirror optical system is characterized by long focal length, wide field and structural asymmetry, which makes the structure design and system adjustment very difficult.…”

Section: Introductionmentioning

confidence: 99%

Design and Research of Off-Axis Three-Mirror Space Remote Sensor Structure

Wang¹,

Xuan²,

Dong³

et al. 2015

TOMEJ

View full text Add to dashboard Cite

On the basis of characteristics of optical system of three-mirror off-axis, with the method of topology optimization, the mirrors' support structure and the frame structure which is a truss structure of the optical system were designed and investigated, the lightweight of the support structure and the truss structure are important, the structure optimization design of the system was completed, which quality is very light, by means of the finite element analysis techniques, we know that the shape error variation RMS and PV of optical mirror which are important indexes of image quality. The modal analysis and dynamic simulation calculation were carried out and the response character of the structure under dynamic environment was solved. Finally, the correctness of the finite element analysis results and the rationality of the design are validated by environmental testing. the analysis and test results indicate that the PV and RMS meet the design indexunder the comprehensive influence of gravity and thermal load which is in the control range, the overall structure have a high enough dynamic stiffness and reasonable distribution of modal, and the dynamic response of Space Remote Sensor was within the allowable range, which meet the use requirement.

show abstract

Optical Design of the Uncoaxial ThreeMirror System with Wide Field of View

Cited by 4 publications

References 0 publications

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

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

Optical System Design of High Definition Video Telephoto Objective and Its Imaging Experiment

Design and Research of Off-Axis Three-Mirror Space Remote Sensor Structure

Contact Info

Product

Resources

About