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

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Locking Lorentz Slides

Locking Lorentz Slides

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conference on current developments in optical design and engineering vII

作者： vranish, JM Germann, LM Lutter, DR Lawrence, DA NASA Goddard Space Flight Ctr Greenbelt MD 20771 USA

ISBN: (纸本)0819428841

The purpose of this paper is to introduce the concept of a Locking Lorentz Slide. Lorentz Slide actuators, which are based on the Lorentz force principal of physics and are also called voice Coils, have earned wide-spread. use in the aerospace industry because of their superior performance (precision, force, stroke, wide temperature range including cryogenics, reliability and compactness). NASA has particularly favored these devices in their space telescopes and scientific instruments. Up to now "voice Coils" have had to keep power on to hold position, which is limiting in many space applications. NASA, however, has found what promises to be a simple, innovative work-around with its Locking Lorentz Slide approach. This paper is an introduction to that concept and its possibilities, so, in this paper, the Locking Lorentz Slide is described, its principles of operation explained and its expected performance given. Since NASA is embarking on a development effort for this actuator more technical papers detailing hardware, tests and detailed analysis will follow.

关键词： Actuators Servomechanisms Space telescopes Aerospace engineering Cryogenics Magnetism Reliability Sensors Hardware testing Temperature metrology

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design and fabrication of hybrid dichroic mirrors for light separation/recombination by using flat plate

Design and fabrication of hybrid dichroic mirrors for light ...

引用

conference on current developments in optical design and engineering vII

作者： Park, JH Hwang, YM Kim, YH Kim, EH Jeong, SY Samsung Adv Inst Technol Display Mat Lab Mat & Devices Sector Suwon 440600 South Korea

ISBN: (纸本)0819428841

We report the design and fabrication of Hybrid Dichroic Mirrors (HDM) for the separation and the recombination of white laser beam by using small sized flat plate far a small Laser Projection Display (LPD) system. This small sized laser projection display system is consist of a white laser, hybrid dichroic mirrors, 3-channel AOM and a beam scanning part. Red, green and blue light beams are separated by one flat plate dichroic mirror and also modulated by the 3-channel AOM, are recombined to one beam by another flat plate dichroic mirror. These hybrid dichroic mirrors are designed to measure the separation and recombination of s-polarized light beams of 647, 515, 488nm wavelength from the white laser. Key element of the mirror design includes the quarter wavelength multilayers optimized to provide the best performance for the separation and recombination of light beams. The calculated values of the transmittance, which are pass through the hybrid dichroic mirror, are 95% for each separated/recombined color beams. The measured values of transmittance are over 90%.

关键词： Hybrid Dichroic Mirrors Laser Projection Display 3-channel AOM separation and recombination

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Review of the design and manufacturing procedures for large format holographic optical element

Review of the design and manufacturing procedures for large ...

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conference on current developments in optical design and engineering vII

作者： Stojanoff, CG Schütte, H Schulat, J Fröning, P Aachen Tech Univ Rhein Westfal TH Aachen Lehr & Forsch Gebiet Hochtemp Thermodynam D-52056 Aachen Germany

ISBN: (纸本)0819428841

The objective of this research program was the development of the technology for the industrial manufacturing of HOEs for technical applications such as: holographic solar concentrators for utilization in photovoltaic energy conversion and solar photochemistry, and integrated holographic stacks for daylighting, glazing and shading in buildings. Some of the fabricated HOEs exhibit apertures in the order of 8 square meters. The accomplished technology facilitates the continuous fabrication of the holographic films on glass or plastic substrata. The standard holographic material we use for the fabrication of HOEs is dichromated gelatin (DCG) on glass or plastic film (PET) substrata The dichromated gelatin layer could be prepared with different compositions to accommodate the desired exposures and chemical processing procedures. At present we manufacture holographic plates on glass substrata in sizes of up to 1 meter square. The holographic film on plastic substratum is 20 cm wide and could be made in lengths of hundredths of meters. The inexpensive fabrication of such large formats is attained by automation of the entire process: film manufacturing, hologram copying, development and test. We present in this paper the design considerations and the developed manufacturing procedures. These comprise the fabrication of large format reflective holograms for concentrating mirrors and the copying of transmissive holograms, such as gratings and lenses, using in-plane contact copying in checkerboard arrangement or rotating drum continuous copying onto an endless plastic film.

关键词： holography HOE large aperture optics fabrication procedures optical materials solar concentrators

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current developments in GRADIUM® glass technology

Current developments in GRADIUM® glass technology

引用

1998 International optical design conference

作者： Hunter, Bv Tyagi, v Tinch, DA Fournier, P LightPath Technol Inc Albuquerque NM 87109 USA

ISBN: (纸本)0819429376

LightPath has continued efforts to improve the range of uses for GRADIUM(R) glass. New glass lines as well as new geometries have been demonstrated. LightPath continues to work with software vendors to improve ease-of-use. At the 1998 CLEO, a lab sample of a transverse gradient (a.k.a. "biaxial") was shown. New products are expected soon. Laboratory work has demonstrated the viability of other glass families. A GTi (GRADIUM Titania) family has been developed as well as a GSI (GRADIUM Spectrally Invariant) material, based on US Patent # 5,689,374, also for use as an achromatic transverse gradient. The new GLaK glass line has one existing profile currently ready and will be publicly released this summer. Considerable efforts have also been made at improving the characterization of GRADIUM glasses, including more accurate profile measurements and investigations of appropriate techniques for modeling the dispersion The improved accuracy is required for apochromatic systems. Finally, as a part of the ongoing process improvement effort, LightPath has formed a strategic partnership with Hikari glass. This relation ship will allow LightPath to have better control over the incoming glass supply and have a grass supply that is better suited for production of GRADIUM glasses. This change will alter the existing profiles;redefinitions will be available this summer.

关键词： GRADIUM gradient-index dispersion modeling transmission

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Optimized design on the light outlet of optical fibre large screen display

Optimized design on the light outlet of optical fibre large ...

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Proceedings of the 1998 conference on current developments in optical Elements and Manufacturing

作者： Shen, Shuqun Yao, He Shen, Yuchao Fan, Rong Beijing Univ of Posts & Telecom Beijing China

optical fibre large screen display is a novel technique in the field of large screen display. The design of the optical fibre light outlet (polyvinyl rode shaped) should be optimized in consideration of the viewing field and the radiant intensity of the screen. The principal direction and the field distribution of the light output of the rode shaped outlet should be considered in designs. The conclusion of the computer simulation shows that the brightness of the screen will reach 4000 nit, the viewing angle will be 20° in meridian plane and 120° in sagittal plane.

关键词： Fiber optics

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design and fabrication of 256×256 diffractive microlens arrays on Si substrates

Design and fabrication of 256×256 diffractive microlens arr...

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Proceedings of the 1998 conference on current developments in optical Elements and Manufacturing

作者： Li, Yi Yi, Xinjian Hao, Jianhua Huazhong Univ of Science and Technology Wuhan China

256×256 diffractive microlens arrays have been designed by considering the independent optical and processing parameters for 3-5 μm wavelength with a microlens size of 100 μm. The lens F number and array pitch are 1.5 and 100 μm, respectively. The diffractive microlens arrays have been fabricated on the surface of Si substrates by successive photolithography and Ar+ ion-beam-etching technique. The practical processes and fabrication method are discussed. The optical characteristics and measurements of the diffractive microlens arrays are presented.

关键词： optical instrument lenses

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Recent developments in composite-based optics

Recent developments in composite-based optics

引用

Space Telescopes and Instruments v conference

作者： Kasl, EP Mehle, Gv Dyer, JE Clark, HR Connell, SJ Sheikh, DA Composite Opt Inc San Diego CA 92121 USA

ISBN: (纸本)0819428035

The objective of this paper is to report the recent developments in lightweight mirror technology that have occurred at Composite Optics, Incorporated (COI). The developments occurred as a result of the activities being conducted in support of the Next Generation Space Telescope (NGST), Microwave Limb Sounder (MLS), and Small Business Innovative Research (SBIR) Programs. Our sponsors on these programs are the Marshall and Goddard Space Flight Centers and the Jet Propulsion Laboratory. The requirements, design approach, actual performance, and the technology status for each program are summarized in the following sections. The emergence of composite designs provides exciting potential for nontraditional, accurate, lightweight, stable, stiff, and high strength composite mirrors'. This evolving technology promises significant improvement in reducing weight, cost and cycle time for future infrared, visible, and x-ray systems. Customers currently embracing composite mirror technology for radiometric use are already reaping substantial system performance benefits. Other customers interested in LIDAR, IR, visible, and grazing incidence x-ray applications are eagerly awaiting successful completion of current technology development and demonstration efforts.

关键词： composite mirror lightweight optic stable stiff micron wavelength visible infrared

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Analysis of hat sections with multiple intermediate longitudinal stiffeners

Analysis of hat sections with multiple intermediate longitud...

引用

Fourteenth International Specialty conference on Cold-Formed Steel Structures: Recent Research and developments in Cold-Formed Steel design and Construction

作者： Acharya, v.v. Schuster, R.M. Durisol Building Systems Inc. University of Waterloo Department of Civil Engineering University of Waterloo

This paper is the second paper by the authors on the subject of the behavior of cold formed steel hat sections in bending with multiple intermediate longitudinal stiffeners. The first paper, also contained in these Proceedings, deals with the test results only (Acharya and Schuster, 1998). Presented in this paper is the analysis associated with the test program that was conducted at the University of Waterloo. The main objective was to develop a consistently accurate and practical method of predicting the ultimate bending strength of sections that fail in overall plate buckling. Recent testing carried out by previous researchers indicates that the bending resistance of multiple stiffened cold formed steel members which fail in overall plate buckling is too conservatively predicted by the current Canadian design standard (S136-94). These researchers have also shown that the American design specification (AISI 96) is also unconservative for the same sections. This investigation primarily includes a theoretical study that is substantiated with the experimental data summarized in the first paper. The current North American design methods were evaluated with respect to their ability to predict the strength of the test specimens. Based on the work by Lind (Lind, 1973), which is shown to adequately predict the strength of sections that experience overall plate buckling, an alternate design method for strength determination is presented.

关键词： Steel structures

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Recent developments in composite-based optics

Recent developments in composite-based optics

引用

Proceedings of the 1998 conference on Space Telescopes and Instruments v. Part 1 (of 2)

作者： Kasl, Eldon P. Mehle, Greg v. Dyer, Jack E. Clark, Harold R. Connell, Steven J. Sheikh, David A. Composite Optics Inc San Diego United States

The objective of this paper is to report the recent developments in lightweight mirror technology that have occurred at Composite Optics, Incorporated (COI). The developments occurred as a result of the activities being conducted in support of the Next Generation Space Telescope (NGST), Microwave Limb Sounder (MLS), and Small Business Innovative Research (SBIR) Programs. Our sponsors on these programs are the Marshall and Goddard Space Flight Centers and the Jet Propulsion Laboratory. The requirements, design approach, actual performance, and the technology status for each program are summarized in the following sections. The emergence of composite designs provides exciting potential for nontraditional, accurate, lightweight, stable, stiff, and high strength composite mirrors. This evolving technology promises significant improvement in reducing weight, cost and cycle time for future infrared, visible, and x-ray systems. Customers currently embracing composite mirror technology for radiometric use are already reaping substantial system performance benefits. Other customers interested in LIDAR, IR, visible, and grazing incidence x-ray applications are eagerly awaiting successful completion of current technology development and demonstration efforts.

关键词： Mirrors

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Computational materials science: an increasingly reliable engineering tool (example: defects in HgCdTe alloys)

Computational materials science: an increasingly reliable en...

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conference on Photodetectors - Materials and Devices III

作者： Sher, A van Schilfgaarde, M Berding, MA SRI Int Menlo Park CA 94025 USA

ISBN: (纸本)0819427268

Computational materials science has evolved in recent years into a reliable theory capable of predicting not only idealized materials and device performance properties, but also those that apply to practical engineering developments. The codes run on workstations and even now are fast enough to be useful design tools. A review will be presented of the current status of this rapidly advancing field. As a demonstration of the power of the methods, predictions of the native point and complex defect, and impurity densities for the Hg-0.8 Cd0.2Te alloy as functions of external processing conditions will be treated. Where measurements have been done, the observed values agree well with the predictions. As an example, we fmd that As incorporates predominately on the cation sublattice, if the material is grown from the Te side of the existence curve las occurs in MBE growth), whereas it tends to reside on the anion sublattice in Hg-saturated growth. On the cation sublattice As is a donor. It is an acceptor on the Te sublattice. We have devised a post-MBE-growth processing method to encourage the transfer of As from the cation to the anion sublattice. Those aspects of the proposed process that have been tested work.

关键词： computational materials science defects in HgCdTe

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