共查询到20条相似文献，搜索用时 156 毫秒
1.
杨素琴 《武汉大学学报(信息科学版)》1985,(4)
为了获得一个较理想的物镜或光学系统,从光学设计理论和实践角度来说,设计结果体现使用要求的成象质量评价问题极为重要。本文以笔者从1978年以来设计并加工了的物镜和光学系统为例讨论了光学系统的象质与接受器相适应的问题;象差平衡方案问题和对单项象差进行综合考虑的原则问题。最后列出了上述物镜和光学系统的结果及其评价。 相似文献
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林银森 《武汉大学学报(信息科学版)》1989,(3)
本文提出等晕代数法用于三组元长出瞳距目镜的初始结构求解及其象差设计。分析结构型式,建立等晕代数方程,并阐述了应用微机编程实现象差平衡的基本原则。文中最后给出两个数字例子的结构参数和象差结果。 相似文献
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本文通过几何光学原理对“波带板激光准直”中旁折光影响进行了分析,得出了波带板激光准直不可能削弱旁折光影响的结论。这一结论对大坝水平位移观测方案的布设具有实际意义。 相似文献
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准直测量是加速器建造和运行中的一项关键技术,用于解决精密、复杂的加速器元件按设计位置在大尺寸空间中精确就位的相关问题,以减少磁铁等关键设备的准直偏差对束流质量及寿命的影响,还用于运行后对元件位置的监测和必要的准直调整.同时,准直测量技术也会在建造期间决定设备安装效率及工期、在运行中影响停机维护时间. 相似文献
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偏光立体显示仪主要包括三部分,投影物镜系统、聚光系统、光源。本文简要介绍光学设计的依据,采用的方案及其计算结果,再经仔细地实验调整,确定了本仪器所使用的各种光学器件。测试表明,各种光学参数都已达到仪器所需指标。试用结果表明,本仪器具有结构简单,便于装配等特点。 相似文献
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本文研究20年来威特RC—8、RC—10航摄机上使用的宽角物镜光学特性的改善问题。比较了物镜类型15Ag,15UAg,15UAgⅡ和15/4UAg等。全部测定过程是在1975年至1979年期间用芬兰赫尔辛基工业技术大学(HUT)制造的水平测角器进行的。15/4UAg物镜样机是于1977年在芬兰赫尔辛基工业技术大学(HUT)测定的。所测定的特性有径向畸变及其非对称性,校准焦距,切向畸变,边缘色象,分解力和调制传递函数(MTF)等。前面所提到的三种物镜15Ag,15UAg,15UAgⅡ的影象质量约相同,但15/4UAg的影象质量比前面三种是有显著的提高。 相似文献
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何对燕 《武汉大学学报(信息科学版)》1988,(3)
用坐标变换计算非共轴光学系统是十分有效的。本文讨论了非共轴光学系统传递函数(OTF)的计算要点,并给出了平行光束传递函数的计算方法。计算了一个无焦系统的波动光学传递函数。 相似文献
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Currently in photogrammetry conventional camera optics, which are based on a combination of lenses, are solely used. These systems are also called refractive systems. The usage of refractive systems implies a general drawback for some applications. Due to the chromatic aberration of lenses, i.e. slightly different imaging functions for different spectral bands, a significant loss of image quality and geometric accuracy has to be accepted. This fact is important especially for applications that require imaging a wide spectral range. Conventional cameras are not able to satisfactorily capture the ultraviolet or near infrared spectral range in addition to the visible.These chromatic aberration problems can be completely be avoided in all-reflective optical systems, i.e. camera objectives which are completely based on mirrors. The paper will briefly describe the developed all-reflective optical systems designed for optical metrology purposes.A general disadvantage of the design of normal or wide angle all-reflective systems is the asymmetry of the mirror arrangement, which leads to large asymmetric geometric image distortions. These distortions cannot be modeled with standard methods of photogrammetry. Furthermore, the complete system is also more sensitive to local deviations from the ideal mirror surface. Therefore we developed a suitable geometric model, which is adapted to the special case. The model is based on the collinearity condition, extended by a specific additional parameter set optimized with regard to the characteristics of an all-reflective unobscured system. We will show various model variants based on the additional parameter sets of Brown, Ebner and Grün as well as Legendre polynomials, Chebyshev polynomials and Fourier series. The paper discusses the potential of these models to correct the distortion of an all-reflective unobscured optical system prototype based on four aspherical mirrors on the basis of test field self-calibration and describes different approaches to consider local deviations from the nominal aspherical mirror surface with the help of the finite elements method. 相似文献
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机(舰)载设备在测量过程中，需要提供准确的飞机(舰船)俯仰、横滚、偏航等姿态信息，但由于机(舰)载惯导系统提供的偏航数据精度较低，不能满足测量的需要，需要对惯导进行校准。针对这种情况，探讨了一种利用机(舰)载光测设备测量方位标修正惯导航向偏差的方法。由于光测设备测量精度比较高，本校准惯导方法满足靶场试验的需求，达到了修正系统误差的目的。试验证明，这种方法是有效、可行的。 相似文献
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Ramesh C. Kaul 《Journal of the Indian Society of Remote Sensing》1981,9(1):17-20
This paper presents a simple method for the determination of fooal length of optical lenses and the accuracy in this method is being enhanced by the addition of simple optical components 相似文献
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G. C. Brock 《The Photogrammetric Record》1973,7(42):687-699
The paper reviews the status of the optical transfer function (OTF) as a potential standard method for measuring the definition of photogrammetric camera lenses. The nature of the OTF and its relation to resolving power are explained. The limited success in obtaining agreement in international comparisons of OTF measurement and the programme of the Scientific Instrument Research Association group research project on the O TFare summarised. Some of the difficulties envisaged in applying the OTF as an ISP standard are discussed. 相似文献
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Nicolas Paparoditis Jean-Philippe Souchon Gilles Martinoty Marc Pierrot-Deseilligny 《ISPRS Journal of Photogrammetry and Remote Sensing》2006,60(6):400
The IGN digital camera project was established in the early 1990s. The first research surveys were carried out in 1996 and the digital camera was first used in production in 2000. In 2004 approximately 10 French departments (accounting for 10% of the territory) were covered with a four-head camera system and since summer 2005 all IGN imagery has been acquired digitally. Nevertheless the camera system is still evolving, with tests on new geometric configurations being continuously undertaken. The progressive integration of the system in IGN production workflows has allowed IGN to keep the system evolving in accordance with production needs. Remaining problems are due to specific camera characteristics such as CCD format, the optical quality of off-the-shelf lenses, and because some production tools are ill-adapted to digital images with a large dynamic range. However, when considering the pros and cons of integrating these images into production lines, the disadvantages are largely balanced by the numerous benefits this technology offers. 相似文献
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C. D. Burnside 《The Photogrammetric Record》1995,15(86):251-261
The paper entitled The Photogrammetric Society Analogue Instrument Project was published in The Photogrammetric Record, 14(82): 565-582 and contained, as Appendix A, an extract from the Archive concerned with the history of the Zeiss Stereoplanigraph in Great Britain. A further three extracts have since been published to provide details of direct optical projection instruments used in this country and of the Vivian Thompson Stereo-plotter.
This fifth extract deals with the Wild A5 and A6 instruments. Their introduction into the United Kingdom during and just prior to the Second World War, together with their important contributions to the war effort, make interesting reading. With a grand total of just five such instruments, they were well used throughout the period of hostilities.
This extract also includes a note on the Wild A4 instrument, designed for close range photogrammetry. This was the last instrument in which Wild made use of projector lenses but it has been included at this point so that all of the Wild instruments which are listed in the Catalogue (and therefore included in the Archive) are dealt with in numerical order. 相似文献
This fifth extract deals with the Wild A5 and A6 instruments. Their introduction into the United Kingdom during and just prior to the Second World War, together with their important contributions to the war effort, make interesting reading. With a grand total of just five such instruments, they were well used throughout the period of hostilities.
This extract also includes a note on the Wild A4 instrument, designed for close range photogrammetry. This was the last instrument in which Wild made use of projector lenses but it has been included at this point so that all of the Wild instruments which are listed in the Catalogue (and therefore included in the Archive) are dealt with in numerical order. 相似文献
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Xu Peiliang 《Journal of Geodesy》1989,63(3):297-308
Nearly all work on the optimal design of networks has been confined to single objective optimal design. Less attention has
been paid to multi-objective optimal design where one must simultaneously optimize precision, reliability and other quantities.
This paper discusses the concept of multi-objective optimal second order design of networks and its properties, which proves
very different from that of single objective optimal design. To demonstrate its applications, a levelling network located
in an earthquake area in the north east of China is taken as an example. The result shows in this case that multi-objective
optimal design is optimal from the point of view of total objectives. 相似文献
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校准平行光管的新方法及其原理 总被引：1，自引：0，他引：1
平行光管是光学实验及计量检测的重要设备。为获得平行光，平行光管的分划权必需严格位于物镜后焦面上。如何将分划权准确地调整至物镜后焦面？传统的诸多方法中，或因设备难求，或受环境制约而难尽人意。本文提出一种校准平行光管的新方法并论证其原理 相似文献