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检索条件"任意字段=Current Developments in Optical Design and Optical Engineering 1991"

共 1065 条记录，以下是41-50 订阅

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DIFFERENTIAL COATING OBJECTIVE

DIFFERENTIAL COATING OBJECTIVE

引用

5TH CONF ON current developments IN optical design AND optical engineering

作者： GOLDFAIN, E Welch Allyn Inc. (United States)

ISBN: (纸本)0819406554

A novel concept on the construction of high-resolution objectives is outlined. Although similar to binary optics technology, this approach brings additional degrees of freedom to the optical design as far as achieving a finer balance of phase curvature via refractive properties and relative thickness of the multilayer stack. The differential coating objective can be used in conjunction with diffractive surfaces to optimize the transmission efficiency and control the secondary spectrum correction. The basic equations describing the monochromatic and three- color achromat predesign are presented.

关键词： optical design Holographic optical elements Coating optical engineering Glasses Lenses Holography Wavefronts Diffraction Multilayers

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PRELIMINARY-STUDY OF THE ADMITTANCE DIAGRAM AS A USEFUL TOOL IN THE design OF STRIPLINE COMPONENTS AT MICROWAVE-FREQUENCIES

PRELIMINARY-STUDY OF THE ADMITTANCE DIAGRAM AS A USEFUL TOOL...

引用

5TH CONF ON current developments IN optical design AND optical engineering

作者： FRANCK, CC FRANCK, JB Western Space and Missile Ctr. (United States)

ISBN: (纸本)0819406554

It has been shown that the Admittance Diagram along with the Quarterwave Rule can be used in the design and characterization of optical thin film coatings. However, this same tool may be utilized in the design and characterization of some microwave components as well. A simple design example of a Wilkinson power divider is presented to illustrate the utility of this optical technique for microwave circuit design and analysis.

关键词： Thin films Microwave radiation Phase shifts Reflectivity optical design Glasses optical engineering Multilayers Refractive index Thin film coatings

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CONE ARRAY OF FOURIER LENSES FOR CONTOURING APPLICATIONS

CONE ARRAY OF FOURIER LENSES FOR CONTOURING APPLICATIONS

引用

5TH CONF ON current developments IN optical design AND optical engineering

作者： GOLDFAIN, E Welch Allyn Inc. (United States)

ISBN: (纸本)0819406554

An application of Fourier transform lenses to surface topography detection is investigated. The field is illuminated in parallel using an array of three different wavelength laser diodes, and relative phase alteration is read out between cross-correlated electronic pixels. Diffraction theory of image formation is used to interpret the modulation in contrast. Speckle sensitivity to wavelength provides the basic technique for noise filtering.

关键词： Lenses Sensors optical design Fourier transforms Linear filtering optical engineering Speckle Diffraction optical filters Reflectivity

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DIFFRACTION ANALYSIS OF optical DISK READOUT SIGNAL DETERIORATION CAUSED BY MARK SIZE FLUCTUATION

DIFFRACTION ANALYSIS OF OPTICAL DISK READOUT SIGNAL DETERIOR...

引用

5TH CONF ON current developments IN optical design AND optical engineering

作者： HONGUH, Y Toshiba Corp. (Japan)

ISBN: (纸本)0819406554

The author proposes a new noise power-spectrum estimation method for mark-dimension fluctuation in optical disks. Diffraction by marks was modeled using Fraunhofer diffraction theory, and mark-dimension fluctuations were taken into account through statistical averaging. The calculated and experimental results agreed well. Fluctuations in the mark edge position mainly contributed to noise.

关键词： Diffraction optical discs Interference (communication) Objectives Video Far-field diffraction optical design optical engineering Statistical analysis Statistical modeling

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optical ANALYSIS OF THERMAL INDUCED STRUCTURAL DISTORTIONS

OPTICAL ANALYSIS OF THERMAL INDUCED STRUCTURAL DISTORTIONS

引用

5TH CONF ON current developments IN optical design AND optical engineering

作者： WEINSWIG, S HOOKMAN, RA ITT Corp. (United States)

ISBN: (纸本)0819406554

The techniques used for the analysis of thermally induced structural distortions of optical components such as scanning mirrors and telescope optics are outlined. Particular attention is given to the methodology used in the thermal and structural analysis of the GOES scan mirror, the optical analysis using Zernike coefficients, and the optical system performance evaluation. It is pointed out that the use of Zernike coefficients allows an accurate, effective, and simple linkage between thermal/mechanical effects and the optical design.

关键词： Mirrors Thermal modeling optical design optical analysis optical engineering Zernike polynomials Performance modeling Thermography Code v optical components

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OPTIMIZATION OF ORIGINAL LENS STRUCTURE TYPE FROM optical LENS DATA-BASE

OPTIMIZATION OF ORIGINAL LENS STRUCTURE TYPE FROM OPTICAL LE...

引用

5TH CONF ON current developments IN optical design AND optical engineering

作者： YANG, DR JIANG, HL LI, GD YANG, HM Changchun Institute of Optics and Fine Mechanics (China)

ISBN: (纸本)0819406554

This paper presents a new idea for the optimization of an initial lens structure type from an optical lens database on the basis of introducing optical lens database (OLDB) and computer- aided optical design (CAOD) systems. Using image-quality target parameters as conditional search parameters of optimization of initial lens structure type from database, and evaluating selected lens quality with surface relative aperture (h/r), the authors were able to obtain a good effectiveness in practice.

关键词： Image quality optical design Lens design optical engineering Databases Glasses Optics manufacturing Crystal optics Mechanics Objectives

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MATRIX optical-SYSTEM FOR PLANE-POINT CORRELATION

MATRIX OPTICAL-SYSTEM FOR PLANE-POINT CORRELATION

引用

5TH CONF ON current developments IN optical design AND optical engineering

作者： CURATU, E Polytechnical Institute of Bucharest (Romania)

ISBN: (纸本)0819406554

Matrices of optical components (like LEDs, microlenses, microzone plates, microspatial filters) are used in some arrangements to obtain the optical transformation from an area of a frontal plane to a point and vice versa. By use of these matrices the following arrangement are established: a matrix optical relay-system, a multichannel optoelectronic hybrid computer, an optical system for pattern recognition by spatial multichannel filtering, and uniform illumination system. The established relationships are applied to calculate the positions, the component sizes, and the system performance. Matrix configuration is shown to be advantageous for maximizing the performance for plane-point correlation and, also, for a miniature solution.

关键词： Lenses Computing systems optical engineering Spatial filters optical design optical filters optical pattern recognition Collimation optical computing Matrices

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design OF AN IMAGING SPECTROMETER FOR OBSERVING OCEAN COLOR

DESIGN OF AN IMAGING SPECTROMETER FOR OBSERVING OCEAN COLOR

引用

5TH CONF ON current developments IN optical design AND optical engineering

作者： WENG, ZC CHEN, ZY CONG, XJ Changchun Institute of Optics and Fine Mechanics (China)

ISBN: (纸本)0819406554

The main parts of the imaging spectrometer for observing ocean color (OCM system) are: the scan subsystem, the pre-position telescope, the dispersion element, and the spectrometer which should be determined according to the science requirements of ocean color observation and the correspondent specifications of the optical design. The authors analyzed the optical systems of the MODIS-T proposed by NASA/Goddard Space Flight Center and found some problems in them. Based on this the authors designed a reflection-refraction hybrid optical system by autocollimation grating. The results are better than the improved MODIS-T optical design in some points--the minimal optical MTF value of the design at the Niquist frequency is better than 0.96, the construction is much more compact.

关键词： Spectroscopy Space telescopes optical design Prisms Imaging systems Mirrors MODIS Monochromatic aberrations Telescopes optical engineering

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AUTOMATIC ADJUSTING optical-AXIS FOR LINEAR CCD SCANNER

AUTOMATIC ADJUSTING OPTICAL-AXIS FOR LINEAR CCD SCANNER

引用

5TH CONF ON current developments IN optical design AND optical engineering

作者： CHANG, RS CHEN, DC National Central Univ. (Taiwan)

ISBN: (纸本)0819406554

A technique which automatically adjusts the optical axis of a CCD image sensor with the lens for a linear CCD image scanner is described. The error of the alignment is measured to the magnitude and pulse-width of the detected signal from the linear CCD image sensor, calculating the value of error by computer and driving the stepping motor to achieve the automatic adjustment.

关键词： Charge-coupled devices CCD image sensors Signal detection Scanners Image sensors Sensors Manufacturing Oscilloscopes optical fabrication optical scanning systems

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REVIEW OF NONDIFFRACTING BESSEL BEAMS

REVIEW OF NONDIFFRACTING BESSEL BEAMS

引用

5TH CONF ON current developments IN optical design AND optical engineering

作者： LAPOINTE, MR Sverdrup Technology Inc. (United States)

ISBN: (纸本)0819406554

The theory of nondiffracting beam propagation and experimental evidence for nearly-nondiffractive Bessel beam propagation are reviewed. The experimental results are reinterpreted using simple optics formulas, which show that the observed propagation distances are characteristic of the optical systems used to generate the beams and do not depend upon the initial beam profiles. A set of simple experiments are described which support this interpretation. It is concluded that nondiffracting Bessel beam propagation has not yet been experimentally demonstrated.

关键词： Beam propagation method Bessel beams Wave propagation Holograms Collimation Diffraction Zone plates Free space optical design Radio propagation

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