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

共 1069 条记录，以下是51-60 订阅

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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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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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ALIGNMENT OF AN ASPHERIC MIRROR SUBSYSTEM FOR AN ADVANCED INFRARED CATADIOPTRIC SYSTEM

ALIGNMENT OF AN ASPHERIC MIRROR SUBSYSTEM FOR AN ADVANCED IN...

引用

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

作者： TINGSTAD, JS Hughes Aircraft Co. (United States)

ISBN: (纸本)0819406554

With many optical systems the method that is used to align the optical system needs to be an integral portion of the system design and not an afterthought. Once all the pieces are in fabrication it may be too late to implement a cost-effective alignment procedure for both prototype and production designs. This is especially true with catadioptric systems where the mirror alignment tends to be very critical as far as system performance is concerned. This paper describes the design and use of an aspheric null mirror for the alignment of a two mirror subsystem to a lens cell. The optical system to be aligned was a six-in. EFL, F/2 system working in the 3-5 micrometers bandpass. It consisted of two aspheric mirrors, one aspheric lens, and two spherical lenses.

关键词： Mirrors Aspheric lenses optical alignment Aspheric optics Combined lens-mirror systems optical engineering Infrared imaging Infrared radiation optical design Spherical lenses

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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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NEW FORMULATIONS BETWEEN SPHERICAL-ABERRATION AND SPHERICAL-ABERRATION COEFFICIENT USING ABBE SINE CONDITION

NEW FORMULATIONS BETWEEN SPHERICAL-ABERRATION AND SPHERICAL-...

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 relationship between aberration and the aberration coefficient is the basic formulation in the field of aberration theory. The Seidel's formulations can only be used in the case of low performance (small aperture and small field), so that a set of correct relations between spherical aberration (SA) and spherical aberration coefficient (SAC) must be derived for the application of large aperture and small viewing field.

关键词： Monochromatic aberrations Aberration theory Aluminum Lutetium optical design optical engineering Chromatic aberrations Information operations Nomenclature Silicon

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INTERFERENCE GRATING WITH AN ARBITRARY TRANSPARENT TO OPAQUE GROOVE RATIO

INTERFERENCE GRATING WITH AN ARBITRARY TRANSPARENT TO OPAQUE...

引用

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

作者： TAVASSOLY, MT Tehran Univ. (Iran)

ISBN: (纸本)0819406554

A new approach to the fringe formation in the interference of light incident on a plane parallel plate is introduced. It is shown that for a particular angle of incidence, which depends only on the refractive index, the interfringes are minimum. It is proved that in an angular interval of few arc degrees around this particular incident angle the interfringes are equal to a high accuracy. It is shown that this feature can be exploited to produce an interference grating with an arbitrary transparent-to-opaque groove ratio, and to measure the wavelength of light and the fine structures of a spectrum with a precision considerably higher than can be obtained in the other similar interferometric methods.

关键词： Refractive index optical design optical engineering Neon Interferometry Opacity Photography Physics Refraction Spectroscopy

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WIDTH GAUGE FOR HOT STEEL PLATES BY LASER SCANNING RANGE FINDER

WIDTH GAUGE FOR HOT STEEL PLATES BY LASER SCANNING RANGE FIN...

引用

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

作者： ADACHI, Y MATSUI, K Sumitomo Metal Industries Ltd. (Japan)

ISBN: (纸本)0819406554

The authors developed a new advanced laser scanning range finder. The width gauge consists of a pair of these range finders. Conventional gauges cannot measure the effective width of complexly shaped plate edges. However, the gauge measures both side profiles of a plate and calculates the effective width with an accuracy of +/- 1.5 mm. This new type of width gauge has been developed and tested at the plate rolling mill at Kashima Steel Works of Sumitomo Metal Industries Ltd.

关键词： Signal detection Distance measurement Sensors Avalanche photodetectors Head optical design optical engineering Phase shifts Modulation Laser scanners

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GLOBAL OPTIMIZATION USING THE Y-YBAR DIAGRAM

GLOBAL OPTIMIZATION USING THE Y-YBAR DIAGRAM

引用

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

作者： BROWN, DM Teledyne Brown Engineering (United States)

ISBN: (纸本)0819406554

Software is under development at Teledyne Brown engineering to represent a lens configuration as a y-ybar or Delano diagram. The program determines third-order Seidel and chromatic aberrations for each configuration. It performs a global search through all valid permutations of configuration space and determines, to within a step increment of the space, the configuration with smallest third-order aberrations. The program was developed to generate first-order optical layouts which promised to reach global minima during subsequent conventional optimization. Other operations allowed by the program are: add or delete surfaces, couple surfaces (for Mangin mirrors), shift the stop position, and display first-order properties and the optical layout (surface radii and thicknesses) for subsequent entry into a conventional lens-design program with automatic optimization. Algorithms for performing some of the key functions, not covered by previous authors, are discussed in this paper.

关键词： optical engineering optical design Mirrors Refraction Software development Vignetting Algorithm development Chromatic aberrations Lens design Bessel functions

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DEVELOPMENT OF HIGH-SPEED HIGH-PRECISION LASER PLOTTER

DEVELOPMENT OF HIGH-SPEED HIGH-PRECISION LASER PLOTTER

引用

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

作者： TACHIHARA, S MIYOSHI, T Asahi Optical Co. Ltd. 2-36-9 Maenocho Itabashi Tokyo 174 Japan

ISBN: (纸本)0819406554

A high-speed, high-precision laser plotter which is called Super Laser Photo Plotter, or S-LPP has been developed. S-LPP has a flat table so that both photographic plates and films can be used, and is capable of writing fine patterns for print circuit boards(PCBs), lead frames for IC, and so on over the area of 640mm X 819mm, with a minimum line width of 10μm, in 60 minutes. It has achieved more than fifty times faster speed than that of a conventional plotter which has almost the same specifications as S-LPP. Several important optical techniques that have given S-LPP its own features are described. © 1991 SPIE. All rights reserved.

关键词： Photographic films

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