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

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A SIMPLIFIED APPROACH TO THE CONTROL-SYSTEM ON A 4-AXIS CURVE GENERATOR

A SIMPLIFIED APPROACH TO THE CONTROL-SYSTEM ON A 4-AXIS CURV...

引用

CONF ON current developments IN optical engineering AND COMMERCIAL OPTICS

作者： LANGDON, W Rogers and Clarke Manufacturing Company (United States)

ISBN: (纸本)0819402044

The simplest approach in developing a Computerized Numerical Control (CNC) machine tool would be to take a manually-operated machine and fit it with a standard, commercially available computer control system and drive packages, or so it would appear from a machine designer's viewpoint. This approach does tend to minimize the overall machine/system development costs; however, it can result in a control system too sophisticated, overly complex, and more expensive than necessary to control the machine.

关键词： Control systems Spindles LCDs optical engineering Computing systems Head Power supplies Switches Control systems design optical encoders

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SENSITIVITY ANALYSIS OF optical-SYSTEMS USING THE ANGLE CHARACTERISTIC

SENSITIVITY ANALYSIS OF OPTICAL-SYSTEMS USING THE ANGLE CHAR...

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CONF ON current developments IN optical engineering AND COMMERCIAL OPTICS

作者： VELZEL, CHF DEMEIJERE, JLF Philips-CFT (The Netherlands) B.V. Optische Industrie de Oude Delft (The Netherlands)

ISBN: (纸本)0819402044

The change of the angle characteristic of an optical system when a component parameter is varied follows from first order perturbation theory. Simple formulas are obtained for the sensitivity of the angle characteristic to changes in position, form and refractive index. These formulas can be applied in the design and assembling of optical systems. In assembling we use them for the measurement of decenters; in design we can obtain the mechanical tolerances from them, and also the magnitude of steps in parameter space to be taken in an optimization procedure. We apply our analysis to the systems that were discussed in a previous paperl. It will be seen that the concept of strain discussed in that paper also applies to the calculation of tolerances. The sensitivity of a system to component shifts and tilts correlates with the strain caused by this component. The sensitivity analysis developed in this paper therefore confirms the conclusion of the previous paper. 1 J.L.F. de Meijere, J.A. Schuurman and C.H.F. Velzel, The use of the pseudo-eikonal in the optimization of optical systems, Proc. SPIE Conf. 1013, sept. 1988, Hamburg.

关键词： Monochromatic aberrations Tolerancing optical engineering Objectives Refractive index Spherical lenses Geometrical optics Assembly tolerances Sensors optical design

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RUGATE BROAD-BAND ANTIREFLECTION COATING design

RUGATE BROAD-BAND ANTIREFLECTION COATING DESIGN

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CONF ON current developments IN optical engineering AND COMMERCIAL OPTICS

作者： WILLEY, RR Opto Mechanik Inc. (United States)

ISBN: (纸本)0819402044

The use of an antireflection (AR) coating which is a series of homogeneous layers whose index steps down from the substrate index to the index of air or a vacuum has been well described in the literature (1,2). These are particularly attractive for high index substrates such as germanium, but are limited by the availability of appropriate real coating materials. The limiting factor is a lack of practical materials whose index is less than about 1.35. Another family of AR coatings which include one or more half wave layers is also known. The most common of these is the classical QHQ design. DeBell(3) reported on designs such as QHHHQ and QHHHHHQ where the H's are alternating high and low index layers. We have found that there is a family of inhomogeneous or "Rugate" index functions which can produce broadband AR coatings. These point to some general principles of AR coating design which have not been previously obvious from the literature. We describe these investigations and findings in graphical form. We discuss the concepts and understanding gained and examine the possibilities and limitations of the approach.

关键词： Antireflective coatings Coating Reflectivity Argon Glasses optical engineering Reflection Refraction Shortwaves Germanium

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Mechanical design of a multielement lens system for space applications

Mechanical design of a multielement lens system for space ap...

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current developments in optical engineering iiI 1988

作者： Gupta, R.K. Babu, N.J. Murthy, T.K. ISRO Satellite Centre Bangalore560017 India

The major problems faced in spaceborne multielement optical systems used for high resolution imagery and remote sensing applications are the stability of optical and mechanical configurations under Shock, Vibration and Thermal cycling environments. The critical parameters to be achieved in a housing design for such situations are the decentering limits and separation limits for temperature variations. In this paper, a new technique for mounting optical elements for such applications is discussed. © 1989 SPIE. All rights reserved.

关键词： Space applications

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design of low jitter sensitive beam expander 3

Design of low jitter sensitive beam expander

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current developments in optical engineering iiI 1988

作者： Shen, Gon-Yen Perkin-Elmer Corporation 100 Wooster Heights Road DanburyCT06810 United States

Beam expander optical and structural characteristics can be utilized to desensitize line of sight (LOS) jitter. The overall LOS jitter for a given disturbance spectrum is largely dependent on the optical alignment sensitivity and the resonance mode shapes of the beam expander. By properly selecting the beam expander configuration design, "nodes" can be generated in terms of the LOS where no, or minimum, participation can be expected for certain frequency bands. By adopting such a design approach, the overall LOS jitter for a given disturbance can be reduced significantly. © 1989 SPIE. All rights reserved.

关键词： Jitter

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design of an optical input device for use by the visually-impaired

Design of an optical input device for use by the visually-im...

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current developments in optical engineering iiI 1988

作者： Kipman, Yair 185 Albany Street CambridgeMA02139 United States

This paper describes the optical hand-held scanner designed for use as an input device to the Kurzweil reading machine for the blind and visually-impaired. This device has numerous advantages over other scanners, chief among which are its high resolution, one-inch field of view, bidirectional capabilities, and compact block-shape. The device allows the user to scan single sheets as well as bound books and magazines. During its three-year development, the major emphasis has been on refining the design to make the device easy to use. This paper addresses the technical issues associated with the human-factors considerations that led us to this design. © 1989 SPIE. All rights reserved.

关键词： Scanning

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optical performance of a waveguide grating imaging device

Optical performance of a waveguide grating imaging device

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current developments in optical engineering iiI 1988

作者： Lawrence, George N. Wang, Mark Hwang, Shiow-Hwei University of Arizona TucsonAZ85721 United States

Waveguide optics in combination with gratings for in- and out-coupling provide a potentially powerful combination for building light, compact optical systems. The gratings may be simple linear gratings or focusing gratings for creating converging beams. To understand these devices and design and analyze them, we must consider both waveguide optical properties and the more common two dimensional optical beams. This paper addresses the special problems of fitting in- and out-coupling features into the usual end-to-end laser modeling methodology. © 1989 SPIE. All rights reserved.

关键词： optical properties

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optical SENSOR designS FOR THE DETECTION OF CRACKS IN optical-MATERIALS

OPTICAL SENSOR DESIGNS FOR THE DETECTION OF CRACKS IN OPTICA...

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CONF ON current developments IN optical engineering AND COMMERCIAL OPTICS

作者： HODOR, JR DECKER, HJ BARNEY, J Lockheed Missiles and Space Company Inc. (United States)

ISBN: (纸本)0819402044

With the advent of new materials for solar cells, such as gallium arsenide, and of thinner materials used in larger flexible solar arrays, such as silicon and protective filter glasses, has come the need for improved methods for the detection of cracks in the optical materials that compose the components of each. Four basic sensor designs have been conceived for use with visibly transmissive, as well as visibly opaque materials. Based upon their specific optical approach, the designs are called brightfield, quasi-brightfield, darkfield reflective and darkfield transmissive. All of these designs rely upon the fact that the crack's cleavage in the material provides a total or near total internal reflection boundary. The basic design simply involves an irradiation source, to which the material is transmissive, and a video camera, which is sensitive to the source's radiation transmitted into and out of the material. Two of the designs have only been demonstrated and await further development, when their need arrives. The other two designs have been developed for specific applications and have been integrated into the production environment at this time. They are proven, viable sensor designs. All of these designs facilitate the extrapolation of the basic crack detection process to future machine vision automation.

关键词： Solar cells Cameras Silicon Video Gallium arsenide Ultraviolet radiation Reflectivity Sensors Infrared cameras Infrared imaging

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Resonator design with an intracavity time-varying index gradient

Resonator design with an intracavity time-varying index grad...

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current developments in optical engineering iiI 1988

作者： Neal, D.R. Sweatt, W.C. Torczynski, J.R. Sandia National Laboratories AlbuquerqueNM87185 United States

Side-pumped lasers such as flashlamp- or react or-pumped lasers often have a nonuniform energy deposition in the gain medium, which can establish a significant transverse index gradient. This gradient significantly complicates energy extraction. A normalized resonator analysis method is developed that predicts resonator stability transitions and mode sizes for parabolic index fields. Parameter studies for some practical classes of resonators are presented, along with some design guidelines. Experimental comparison for a long-pulse gas laser shows good agreement with stability transition times. Two resonator-design approaches are presented for increasing the extraction efficiency in the presence of intracavity index gradients. © 1989 SPIE. All rights reserved.

关键词： Resonators

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Support for the U.S. Precision optics manufacturing base center for optics maufacturing

Support for the U.S. Precision optics manufacturing base cen...

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current developments in optical engineering and Commercial Optics 1989

作者： Leshne, Robert H. Trans World Optics 123 Marcus Blvd. HauppaugeNY11788 United States American Precision Optics Manufacturers Association 2020 K Street N.W. WashingtonDC20006 United States

The importance of optics to the economic and military strength of the United States is well known. Advances in optical technology have substantial leverage and are closely related to advances in associated technologies (i.e., imaging, sensing, communications, guidance control, etc.). However, the lead in manufacturing and fabrication of optical components and systems has been lost to our world competitors, especially Japan and other Pacific Rim countries. The optics industrial base has been in a slow but constant decline since the 1970's. The shift in business strategy from manufacturing emphasis to purchasing from worldwide resources has resulted in many U.S. "manufacturers" becoming importers. Optics employment dropped 50% from 1981 to 1986. Imports currently dominate both the U.S. commercial and DOD optics markets.

关键词： Optics manufacturing Manufacturing Computing systems optical engineering Computer aided design design for manufacturability Databases Precision optics Defense and security Metrology

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