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

共 1426 条记录，以下是1071-1080 订阅

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WAVE-FRONT ESTIMATE FROM WAVE-FRONT SLOPE MEASUREMENT BY COMPARING THEIR ZERNIKE POLYNOMIALS FITTING COEFFICIENTS 4

WAVE-FRONT ESTIMATE FROM WAVE-FRONT SLOPE MEASUREMENT BY COM...

引用

Conference on current developments in optical design and optical engineering IV

作者： SHEN, W CHANG, MW WAN, DS NATL CENT UNIV INST OPT SCICHUNGLI 32054TAIWAN

ISBN: (纸本)0819415871

In this paper, a new method used to calculate the Zernike coefficients of wave aberration from ray aberration and from finite shearing of wavefront is proposed. The simulated results are compared with the least squares fitting method, and indicate that the Zernike coefficients of wave aberration can be calculated as accurately with the new method as with the least squares fitting method, but with less computation and operation.

关键词： optical TESTING INTERFEROMETRY POLYNOMIALS

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BUCHDAHL DISPERSION MODEL FOR GRADIENT-INDEX GLASS FAMILIES 4

BUCHDAHL DISPERSION MODEL FOR GRADIENT-INDEX GLASS FAMILIES

引用

Conference on current developments in optical design and optical engineering IV

作者： MANHART, PK PAGANO, RJ LIGHTPATH TECHNOL INC TUCSONAZ 85704

optical elements which are made out of macro gradient refractive material are represented by lines, as opposed to points, on the glass map (nd Vs. vd diagram). Thus, optical designers need account for gradient dispers... 详细信息

ISBN: (纸本)0819415871

optical elements which are made out of macro gradient refractive material are represented by lines, as opposed to points, on the glass map (n_d Vs. v_d diagram). Thus, optical designers need account for gradient dispersion as well as gradient index. A dispersion model for the material must be readily available and optical design programs must be capable of defining and maintaining this relationship before and during optimization, simplifying user input and confining the material to walk a well defined path on the glass map. Thinking in terms of lines on the glass map for arbitrary glass families yields a simple dispersion model based on least squares fitting of Buchdahl coefficients. This paper introduces the concept of glass lines and outlines a technique to construct a dispersion model for any contiguous family of gradient refractive material.

关键词： Glasses optical design Gradient-index optics Diffusion Lead optical components Lead glass Refraction optical properties Optimization (mathematics)

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NONDESTRUCTIVE EVALUATION OF AN EPOXY-BASED COATING BY optical INTERFEROMETRY TECHNIQUES 4

NONDESTRUCTIVE EVALUATION OF AN EPOXY-BASED COATING BY OPTIC...

引用

Conference on current developments in optical design and optical engineering IV

作者： HABIB, K KISR DEPT MAT APPLICATSAFAT 13109KUWAIT

ISBN: (纸本)0819415871

A fundamental study on evaluating an epoxy-based coating was conducted. The study aimed to determined the performance of the coating on a low carbon steel as a result of chemical contaminations. Coated samples were tested in a local tap water by using the method of real time— holographic interferometry. A mathematical model was used along the obtained experimental data. The model described processes of detecting the early corrosion of the the steel under the coatings by holographic interferometry. Consequently, the holographic interferonxetry technique was found very useful in detecting the early corrrosion processes of the coated steel Also, a relationship between the displacement of the coating ,dueto metal corrosion under the coating, and corrosion current density of the coated steel was established for the epoxy-based coating with and without an addition of sodium chloride to the coating.

关键词： Coating Corrosion Holographic interferometry Metals Mathematical modeling Holography Nondestructive evaluation optical interferometry Carbon Photography

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optical-SYSTEMS design FOR FOCAL-PLANE TESTING USING DIRECT WRITE SCENE GENERATION 4

OPTICAL-SYSTEMS DESIGN FOR FOCAL-PLANE TESTING USING DIRECT ...

引用

Conference on current developments in optical design and optical engineering IV

作者： DOUB, CA CALSPAN CORP AEDC OPERATARNOLD AFBTN 37389

ISBN: (纸本)0819415871

Infrared Focal Plane Array (FPA) sensors are commonly tested using various means of scene generation. At the Arnold engineering Development Center a Direct Write Scene Generator (DWSG) is being developed. The DWSG projects the scene onto the focal plane array by scanning a rake of beams across the sensor. The rake consists of up to 256 synchronous beams generated by passing a single laser beam through an acousto-optic deflector (AOD). A complex radio frequency signal input into the AOD diffracts the laser beam into multiple beams. Each pixel of the focal plane is illuminated by one of the beams in the rake. The Direct Write Scene Generator is being designed to test a focal plane area as large as a 512 X 512 pixel array. Scan optics focus an expanded laser beam to a spot smaller than the focal plane pixel pitch over the entire test area. Several optical configurations and multiple AODs are needed to achieve the test requirements at various wavelengths. Some important considerations in the optical design are spot size, crosstalk, and background radiation.

关键词： Staring arrays Lens design Acousto-optics Distortion Scanners Sensors optical design Beam steering Diagnostics Laser sources

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A METHOD TO ANALYZE optical WAVE-GUIDES WITH ARBITRARY INDEX PROFILES 4

A METHOD TO ANALYZE OPTICAL WAVE-GUIDES WITH ARBITRARY INDEX...

引用

Conference on current developments in optical design and optical engineering IV

作者： PALACIOS, SL CRESPO, RD RODRIGUEZ, J FERNANDEZ, S VIRGOS, JM FERNANDEZ, JM GUINEA, A OLIVARES, J UNIV OVIEDO DEPT APPL PHYSE-33007 OVIEDOSPAIN

ISBN: (纸本)0819415871

We present a theoretical method which makes it possible to analyze 3-D integrated optical waveguides with arbitrary refractive index profiles. With this method it is easy to obtain effective indexes, propagation constants and coupling/switching properties of planar and channel optical waveguides. This theoretical approach involves modelling the original optical waveguide by means of an Equivalent optical Waveguide whose effective index is evaluated by applying a technique that we call the Asymptotic Effective Index Method. The theoretical results show good convergence and accuracy for effectives indexes, propagation constants and coupling/switching characteristics. © 1994 SPIE. All rights reserved.

关键词： optical waveguides

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STABILITY OF THE optical-PROPERTIES OF ABNORMALLY DISPERSIVE LIQUIDS 4

STABILITY OF THE OPTICAL-PROPERTIES OF ABNORMALLY DISPERSIVE...

引用

Conference on current developments in optical design and optical engineering IV

作者： PETROVA, MV PLYUKHIN, AG TOLSTOY, MN ROBB, P SIGLER, RD LEARY, DF VAVILOV STATE OPT INST ST PETERSBURGRUSSIA

ISBN: (纸本)0819415871

Abnormal dispersion is found in a large number of optical liquids. These liquids are quite useful in the design of apochromatic lens systems because they are inexpensive and are readily available compared to the expensive abnormal dispersion glasses and crystals more commonly used. Further, there is no practical upper limit on the size of a liquid optical element. However, because the use of these materials as optical elements is quite new, the long term stability of their optical properties after exposure to various environmental conditions must be determined. In this paper, we report on a series of tests performed to determine the optical stability of several abnormal dispersion liquids. The liquids were subjected to: (1) high intensity ultraviolet radiation, (2) high temperatures, and (3) long term exposure to air. Measurements of both optical transmission and refractive index were performed before and after each exposure. The tests were performed on four abnormal dispersion liquids that have been found to be quite useful in the design of apochromatic lenses. The results indicate that long term exposure to either intense ultraviolet radiation or air, produced only negligible changes in the index of refraction. Changes in optical transmission were observed, but they were largely confined to the ultraviolet spectral region. Prolonged exposure to temperatures of 60 degree(s)C did not produce any measurable change in the optical properties. The measurements were performed at the Vavilov State optical Institute, St. Petersburg, Russia, in collaboration with Lockheed Palo Alto Research Laboratory, Palo Alto, California.

关键词： Liquids Ultraviolet radiation Absorption Glasses Lens design optical properties Refractive index Visible radiation Lamps optical components

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NON-PHOTOLITHOGRAPHIC FABRICATION OF LARGE COMPUTER-GENERATED DIFFRACTIVE optical-ELEMENTS 4

NON-PHOTOLITHOGRAPHIC FABRICATION OF LARGE COMPUTER-GENERATE...

引用

Conference on current developments in optical design and optical engineering IV

作者： VERNOLD, CL MILSTER, TD UNIV ARIZONA CTR OPT SCITUCSONAZ 85719

ISBN: (纸本)0819415871

Large computer generated diffractive optical elements (DOE's) are useful in many applications. Typical sizes of DOE's range from 6 inches up to two meters in diameter. current state-of-the-art techniques for fabricating these DOE's involve photolithographic processing where photoresist is used as the light sensitive medium and an etchable metal layer is used to form the pattern of the DOE. Handling and costs associated with photolithographic methods become critical issues when the DOE's become large. It is therefore advantageous to have a technique that would not require the photolithographic step in the process. This paper will discuss the instrument and the technique used at the optical Sciences Center (OSC) for fabricating large computer generated DOE's. A non-photolithographic technique of thermally selective oxidization is used to transfer the DOE pattern onto a metallic film on the substrate. The subsequent etching part of the process takes advantage of the differential etch rates of a non-oxidized and oxidized metal. Figure results indicate the accuracy of using this approach to fabricate DOE's is better than (lambda) /100 rms.

关键词： LASER WRITING DIFFRACTIVE OPTICS

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DERIVATION OF STRUCTURAL INFLUENCE COEFFICIENTS FOR LONG-FOCUS IMAGING optical-SYSTEMS 4

DERIVATION OF STRUCTURAL INFLUENCE COEFFICIENTS FOR LONG-FOC...

引用

Conference on current developments in optical design and optical engineering IV

作者： DEBRUIN, JC JOHNSON, DB TEXAS INSTRUMENTS INC CTR CONTROL SYST TECHNOLDALLASTX 75266

ISBN: (纸本)0819415871

The structural influence coefficients for an imaging optical system map the decenter and tilt motions of the system elements to changes in the direction and orientation of the line-of-sight and image. A methodology is presented to calculate the structural influence coefficients for the lenses of long-focus (near-infinity) imaging optical systems. Single-lens systems are considered first, with the method then extended to handle multiple elements. Use of an arbitrary structural reference frame is discussed, along with an algorithmic, recursive approach to numerical calculation of the structural influence coefficients. A complete derivation is presented at each step, and an overview of the geometric optical principles involved is provided for reference. The method described allows ready calculation of influence coefficients without tedious ray-trace perturbations or dedicated optical analysis software. This paper is a companion to a previous paper by the authors, in which the structural influence coefficients for plane-mirror systems are derived. The influence coefficient method of both papers is unique in its use of line-of-sight reference frames as an optical kinematic tool to track pointing direction and image orientation.

关键词： STRUCTURAL INFLUENCE COEFFICIENTS IMAGING optical SYSTEMS optical KINEMATICS LINE-OF-SIGHT REFERENCE FRAMES GEOMETRIC OPTICS LENS DECENTER STRUCTURAL VIBRATION MECHANICAL TOLERANCE

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INTEGRATED ION-BEAM MILLING AND COATING FOR PRECISION optical FABRICATION 4

INTEGRATED ION-BEAM MILLING AND COATING FOR PRECISION OPTICA...

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Conference on current developments in optical design and optical engineering IV

作者： HYLTON, KW EGERT, CM THOMAS, KA OAK RIDGE NATL LAB CTR ULTRA PRECIS MFG TECHNOLOAK RIDGETN 37831

ISBN: (纸本)0819415871

An ion beam milling system, used for precision optical fabrication, was modified to easily allow deposition of thin films onto the same optics within a single vacuum operation. A series of coating experiments was performed to assess this approach to integrated ion milling and optical coating. Attempts were made to maximize the deposition rates while maintaining a narrow distribution of coating material to provide the optimum total process time. A series of shaped sputter targets was found to maintain high deposition rates similar to those of a flat target but without having the desired effect of narrowing the material distribution. Apertured shields produced narrow material distributions but at the expense of significantly lowering the deposition rates. Despite these limitations, analysis shows that thin optical films can be produced in a reasonable time by this approach.

关键词： Ions Coating Ion beams Optics manufacturing Thin films optical fabrication Thin film deposition Sputter deposition optical coatings Thin film manufacturing

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Location of mechanical features in lens mounts 4

Location of mechanical features in lens mounts

引用

current developments in optical design and optical engineering IV 1994

作者： Yoder, Paul R. Consultant in Optical Engineering 1220 Foxboro Drive NorwalkCT06851 United States

design of mechanical features such as spacers, retainers and/or cell shoulders used to locate and constrain lens components within a mount entails application of geometric relationships that depend upon the types of glass-to-metal interfaces to be provided. This paper describes the pertinent geometry of the most common surface-contact interface types ("sharp corner", spherical, tangential and toroidal) and gives equations for locating key features of the mechanical parts relative to the associated lens vertices. Examples illustrate the use of these equations to dimension mechanical features in typical lens/mount configurations. © 1994 SPIE. All rights reserved.

关键词： Optomechanics

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