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检索条件"任意字段=Current Developments in Optical Design and Optical Engineering III"

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Minimizing gravity sag of a large mirror with an inverted Hindle-mount

Minimizing gravity sag of a large mirror with an inverted Hi...

引用

Conference on current developments in Lens design and optical Systems engineering

作者： Robinson, DW NASA Goddard Space Flight Ctr Greenbelt MD 20771 USA

ISBN: (纸本)0819437387

A method of minimizing the optical distortion from gravity sag on a suspended large autocollimating flat mirror has been devised. This method consists of an inverted nine-point Hindle-Mount. A conventional Hindle-Mount is located underneath a sky-viewing mirror and is primarily under compression loads from the weight of the mirror. It is not suitable for the situation where the mirror is viewing the ground, since a mirror would tend to fall out of the mount when in an inverted position. The inverted Hindle-Mount design consists of bonded joints on the backside of the mirror that allow the mirror to be held or suspended above an object to be viewed. This ability is useful in optical setups such as a calibration test where a flat mirror is located above a telescope so that the telescope may view a known optic.

关键词： Hindle mount optical mounting techniques bonding epoxy cell

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Eyepiece design with refractive-diffractive hybrid elements

Eyepiece design with refractive-diffractive hybrid elements

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Conference on current developments in Lens design and optical Systems engineering

作者： Yun, ZS Lam, YL Zhou, Y Yuan, XC Zhao, LP Liu, J Nanyang Technol Univ Sch Elect & Elect Engn Photon Res Grp Singapore S639798 Singapore

ISBN: (纸本)0819437387

Eyepieces are a part of visual optical systems. Because of their wide field of view and long eye-relief, it is difficult to further improve the existing eyepieces using all-refractive surfaces. Since diffractive elements demonstrate unique characteristics: negative dispersion and non-field curvature, the eyepiece design can be improved by using refractive-diffractive hybrid surfaces. In this paper, several design examples using refractive-diffractive hybrid surfaces to design moderate field of view (FOV) eyepieces were studied. Firstly, a design example using a diffractive surface to replace the negative piece in the cement doublet of a conventional Kellner type eyepiece is presented. Then a design example is given by employing two diffractive elements to replace the negative elements used in the conventional symmetrical eyepiece. For the above examples the eyepiece aberration correction techniques were also analyzed.

关键词： optical design lens design diffractive optics eyepiece

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design study of a 2.2x zoom lens using plastic materials

Design study of a 2.2x zoom lens using plastic materials

引用

Conference on current developments in Lens design and optical Systems engineering

作者： Shi, WM Newell, MP Fischer, RE OPT 1 Inc Westlake Village CA 91362 USA

No abstract available.

ISBN: (纸本)0819437387

No abstract available.

关键词： Zoom lenses Distortion Glasses Aspheric lenses Lens design Vignetting Chemical elements Cameras Plastic lenses Chromatic aberrations

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optical design of SHASM: Segmented hexagon array solar mirror

Optical design of SHASM: Segmented hexagon array solar mirro...

引用

Conference on current developments in Lens design and optical Systems engineering

作者： Huegele, VB NASA George C Marshall Space Flight Ctr SOMTC Huntsville AL 35812 USA

ISBN: (纸本)0819437387

A segmented array of mirrors was designed for a solar concentrator test stand at MSFC for firing solar thermal propulsion engines. The 144 mirrors each have a spherical surface to approximate a parabolic concentrator when combined into the entire 17-foot diameter array. The mirror segments are aluminum hexagons that had the surface diamond turned and quartz coated. The array focuses sunlight reflected from a heliostat to a 4 inch diameter spot containing 8 kilowatts of power at the 15 foot focal point. The derivation of the surface figure for the respective mirror elements is shown. The alignment process of the array is discussed and test results of the system's performance are given.

关键词： segmented mirror array spherical approximation solar thermal propulsion solar power

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Calculation of diffraction in the presence of aberrations by numerical methods based on critical points and semi-periodic zones

Calculation of diffraction in the presence of aberrations by...

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Conference on current developments in Lens design and optical Systems engineering

作者： Ferré-Borrull, J Bosch, S Univ Barcelona Dept Fis Aplicada & Opt E-08028 Barcelona Spain

ISBN: (纸本)0819437387

The numerical calculation of diffraction integrals in systems with aberrations is addressed from the point of view of a new geometrical interpretation of the diffraction phenomena. This interpretation is based on the division of the integration domain in semiperiodic zones that isolate the integrand oscillations. Moreover, the critical points of the aperture allow to identify the zones with a net contribution to the diffracted field. With the help of this interpretation it is possible to define methods for calculating the diffraction of a spherical wave incident on an aperture. We study the problems that arise when these methods have to be applied to waves in aberrated systems and we propose a solution based on the analysis of the behavior of the optical path of the wave incident on the exit pupil of the system.

关键词： diffraction integrals semi-periodic zones critical points aberrated optical systems

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Systems engineering analysis of image quality

Systems engineering analysis of image quality

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current developments in Lens design and optical Systems engineering

作者： Harvey, James E. Krywonas, A. Univ of Central Florida Orlando United States

A linear systems approach (multiplying MTFs or convolving PSFs) to performing a complete systems engineering analysis of image quality is described. This includes not only the traditional diffraction analysis and the evaluation of image degradation from residual design errors;but also includes image degradation due to scattering effects from residual optical fabrication errors, assembly and alignment errors, and all other potential error sources appearing in a detailed error budget tree. The effects of mosaic detector arrays upon systems performance and the optimum system design will also be discussed. This analysis allows optical fabrication tolerances to be determined during the design phase of a program, frequently resulting in substantial cost and schedule savings. Inaccuracies in the linear systems assumption will be presented for several different applications.

关键词： Image analysis

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optical design of a near-infrared birefringent filter system and measurement on birefringence index of calcite

Optical design of a near-infrared birefringent filter system...

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Conference on current developments in Lens design and optical Systems engineering

作者： Wang, JS Wang, HM Spirock, TJ Lee, CY Ravindra, NM Ma, J Goode, PR Denker, C New Jersey Inst Technol Dept Appl Phys Newark NJ 07102 USA

ISBN: (纸本)0819437387

In this paper, we present an optical design of a near-infrared (at FeI 15648.5 Angstrom) birefringent filter system which is used to obtain the chromatic images of the sun and measure the solar magnetic field at the Big Bear Solar Observatory (BBSO). This system consists of a prefilter, a liquid crystal analyzer, a wavelength-tunable birefringent filter and a Fabry-Perot Etalon. This system is expected to achieve a clean narrow pass band (1/8 Angstrom). It can also be tuned across the spectral line to obtain line profiles of two-dimensional fields of view. During the design of the tunable near-IR birefringent filter and the test of its components, we found the value of birefringence index mu (n(e) - n(o)) of calcite at spectral range near 15648.5 Angstrom is very different from the value in literature(1). Because the birefringence index is important for the design of birefringent optical components, the birefringence index of calcite and its thermal coefficient are measured. Some test results of the four pairs of calcite prate used in the birefringent filter are presented.

关键词： near-infrared birefringent filter calcite birefringence index Zeeman effect

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Cryogenic optical design and testing of the Focal Plane Opto-Mechanical Assembly for the Tropospheric Emission Spectrometer

Cryogenic optical design and testing of the Focal Plane Opto...

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Conference on current developments in Lens design and optical Systems engineering

作者： Crowther, BG Elwell, JD Anderson, RE Space Dynam Lab Logan UT 84341 USA

ISBN: (纸本)0819437387

The Tropospheric Emission Spectrometer (TES) is one of the instruments slated to fly on the EOS Aura satellite in 2003. TES is a Fourier transform spectrometer designed to measure the concentration of various tropospheric chemical species. The Focal Plane Opto-Mechanical Assemblies (FPOMAs) are situated at the end of the TES optical train and are comprised of cryogenic telescopes, reimaging optics, and focal planes. We present the cryogenic optical design of the FPOMA units and discuss optimization parameters and predicted performance. We present measured performance data and compare it with the predicted performance.

关键词： Tropospheric Emission Spectrometer TES Focal Plane Opto-Mechanical Assembly FPOMA optical design cryogenic performance

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Diffractive optical systems adapted for the outer space operation

Diffractive optical systems adapted for the outer space oper...

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Conference on current developments in Lens design and optical Systems engineering

作者： Constantinov, B Pasechnic, T Sircu, S State Univ Moldova Dept Phys MD-2009 Chisinau Moldova

ISBN: (纸本)0819437387

Present paper considers a technique of diffraction element microminiaturization in the process of optical data recording onto photothermoplastic films (PTPFs) by using the photothermoplastic recording (PTPR) equipment adapted for outer space. It has been found that the application of surface - active substances (SAS) onto the free surface of PTPF facilitates the appearance and evolution of microdiffraction optical systems (whose period doesn't exceed 1 mum) on the profile of basic diffraction elements (with a period < 5 m). Miniature dimensions of microdiffraction elements provide high resolution without loss in diffraction efficiency, as the dimensions, shape (depth) of a diffraction element actually depend not only on the thickness of the visualising layer but also on SAS properties, namely on the dielectric and physical - chemical properties and, particulary, on the ability of SAS to influence onto the surface tension. The shift in the flow point of the visualising layer material provides the increase both in the diffraction efficiency and resolution at the expense of discretization of the surface diffraction elements into 2, 4, 6, ... microdiffraction elements.

关键词： photothermoplastic films surface - active materials resolution diffraction efficiency

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Assessment, optimization, and tolerancing methods for visual instruments

Assessment, optimization, and tolerancing methods for visual...

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Conference on current developments in Lens design and optical Systems engineering

作者： Deslis, A Mouroulis, P Davidson Optron Inc W Covina CA 91790 USA

ISBN: (纸本)0819437387

A strategy for optimizing both the on-axis and the off-axis performance of coherently (directly) coupled visual instruments is presented. The strategy draws on the recently published body of data regarding the influence of various individual Seidel aberration and aberration combinations on subjective contrast sensitivity and resolution tasks, as well as studies on the correlation between subjective image quality and objective instrumental figures of merit. An MTF-based metric allows both optimization and tolerancing to be performed in a coherent manner that is based on experimental results of the effects of aberrations.

关键词： optimization visual systems optical design tolerancing MTF

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