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

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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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REvISION OF THE SEIDEL ABERRATION THEORY FOR APPLICATION IN RANGE OF SMALL vIEWING FIELD AND LARGE APERTURE

REVISION OF THE SEIDEL ABERRATION THEORY FOR APPLICATION IN ...

引用

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

作者： KANG, SG LU, KC ZHU, YF Harbin Institute of Technology (China)

ISBN: (纸本)0819406554

The revisions of enlarging all the aberrations related to aperture to the seventh order for the Seidel aberration theory have been proposed in this paper. The practice of the revised theory in the range of small viewing field and large aperture (for example, the lens of microscope and telescope) has proven that the theory is applicable in this scale.

关键词： Monochromatic aberrations Aberration theory optical design Microscopes optical engineering Telescopes Chromatic aberrations Glasses Lutetium Wavefronts

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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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PLASTIC LENS ARRAY WITH THE FUNCTION OF FORMING UNIT MAGNIFICATION ERECT IMAGE USING ROOF PRISMS

PLASTIC LENS ARRAY WITH THE FUNCTION OF FORMING UNIT MAGNIFI...

引用

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

作者： TAKAHASHI, E TANJI, S TANAKA, A HAYASHI, Y Fujitsu Ltd. (Japan)

ISBN: (纸本)0819406554

An original plastic-lens array molded integrally as one block having a function of forming a unit-magnification erect image has been developed. The lens array consists of eight lens devices. The lens device has a roof prism, a reflecting v-groove, and a pair of convex-lens surfaces. A prototype of the lens arrays are arranged side by side. Thickness of the lens array is 4.5 mm, distance between object and image planes is 14.4 mm, array pitch is 1.3 mm, and the effective imaging region is 220 mm. The average modulation transfer function (MTF) at 41 p/mm of the lens array is 76% in the row direction (Y-direction) and 80% in the direction (X-direction) normal to Y-direction. The average F/NO in line-scanning is 1.8. The average irradience unevenness in line-scanning is 17%. The focal depth is +/- 0.6 mm in the area with the MTF being 60% or more. With this prototype a high-resolution image was attained. So, the lens arrays can be applied to imaging devices for use in a compact facsimile, image scanner, LED printer, and so on.

关键词： optical engineering Prisms Prototyping Modulation transfer functions optical design Lens design Fringe analysis Imaging arrays Imaging devices Scanners

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CONE ARRAY OF FOURIER LENSES FOR CONTOURING APPLICATIONS

CONE ARRAY OF FOURIER LENSES FOR CONTOURING APPLICATIONS

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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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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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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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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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IMPEDANCE OF AN Uv PREIONIZED EXCIMER LASER

IMPEDANCE OF AN UV PREIONIZED EXCIMER LASER

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

作者： NASSISI, v University of Lecce Department of Physics Istituto Nazionale di Fisica Nucleare Sezione di Lecce CP. 193 Lecce 73100 Italy

ISBN: (纸本)0819406554

This paper reports the behaviour of an XeCl laser having two independent preionizers which generate Uv radiation into the discharge region in the perpendicular and parallel direction to the electrode surfaces. Output energy and other parameters have been measured using single preionizer and both preionizers, changing the power supply polarity and varying the delay time between the preionization and the main discharge. When the preionization system generated photons only in the direction perpendicular to the electrode surfaces and a negative power supply was used, a high discharge current and a high output laser energy were obtained. Besides, diffusion coefficient of the photo-preionized electrons played an important role in the laser behaviour, particularly, when a consistent delay time between the onset time of the preionization and the main discharge was present. During the breakdown the discharge impedance is time dependent and its value changes as the preionizer change position. By comparing the experimental results obtained by the equation of the discharge electric circuit, it is possible to get exactly the electric element value which simulate the discharge impedance. © 1991 SPIE. All rights reserved.

关键词： Excimer lasers

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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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