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

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NEW-TYPE PSEUDORANDOM POSITION optical ENCODER WITH SUBMICROMETER RESOLUTION - design AND CHARACTERIZATION 4

NEW-TYPE PSEUDORANDOM POSITION OPTICAL ENCODER WITH SUBMICRO...

引用

Conference on current developments in optical design and optical engineering IV

作者： DURANA, M MILES, R ROBERT, P SWISS FED INST TECHNOL INST METROLDEPT ELECT ENGNCH-1015 LAUSANNESWITZERLAND

ISBN: (纸本)0819415871

The characteristics of a new twin-track absolute position optical encoder are presented. One track containing a pseudorandom code and the second a periodic pattern are synchronously engraved on a glass slab. The optical reading head design composed of a LED, a gradient index lens and a linear CCD array, with simple intensity-based signal processing to read the code pattern is described in detail. This design is combined with a standard Moire method to enhance resolution. Performance enhancement of the optical reading head is studied in terms of track illumination versus code density, detector geometry versus the lens point-spread function (Airy disk);and reduction of extrinsic spatial noise by the application of thick films. Each parameter was considered in terms of the optimal field of view and depth of field of the system. © 1994 SPIE. All rights reserved.

关键词： ABSOLUTE POSITION ENCODERS PSEUDORANDOM CODES optical MEASUREMENTS INSTRUMENTATION

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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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Estimation of mounting-induced axial contact stresses in multi-element lens assemblies 4

Estimation of mounting-induced axial contact stresses in mul...

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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

Prior publications dealing with techniques for estimating axial contact stresses in lenses mechanically clamped axially near their rims have assumed the lenses to be single elements. In this paper, we expand the theory to include multiple-element lenses such as cemented doublets and optomechanical designs with spacers or equivalent cell features between separated lenses. Examples are given to illustrate the use of these new analytical techniques. © 1994 SPIE. All rights reserved.

关键词： Optomechanics

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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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STABILITY OF THE optical-PROPERTIES OF ABNORMALLY DISPERSIVE LIQUIDS 4

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

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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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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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Refractive indices of Liquids in the infrared spectral region 4

Refractive indices of Liquids in the infrared spectral regio...

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current developments in optical design and optical engineering IV 1994

作者： Petrova, Maria V. Plyukhin, Andrei G. Tolstoy, Michael N. Robb, Paul Sigler, Robert D. Leary, David F. Vavilov State Optical Institute St.-Petersburg Russia Lockheed Palo Alto Research Laboratory Palo AltoCA94304-1191 United States

Liquids have not found widespread application in optical design for a number of reasons, one of which is the fact that index of refraction data for liquids is available for only very few compounds, and the data that do exist are only in the visible spectral region. In this paper we report on the results of our joint project for measuring the refractive index of liquids in the infrared (IR) spectral region. A number of liquids have transmission passbands that extend well into the IR, to wavelengths of 10 μm and beyond. Many of these liquids also have abnormal dispersion and are suitable for low-cost apochromatic lens designs in the infrared. Using these materials, design options that significantly reduce the cost and weight of IR imaging systems become available. These measurements have been made at the Vavilov State optical Institute, Saint Petersburg, Russia, in collaboration with the Lockheed Palo Alto Research Laboratory. © 1994 SPIE. All rights reserved.

关键词： Dispersion (waves)

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ALGEBRAIC APPROACH FOR OPTIMIZING A TRIPLET lens

ALGEBRAIC APPROACH FOR OPTIMIZING A TRIPLET LENS

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Conference on current developments in optical design and optical engineering III

作者： KASSIM, AM AL QUDS UNIV COLL SCI & TECHNOLDEPT PHYSJERUSALEMISRAEL

ISBN: (纸本)081941249X

Using the concept of matrix theory for lens design, a triplet lens can be replaced by a singlet lens which has an equivalent system matrix without changing its optical performance. Then, using third order Siedel's first aberration coefficient of the singlet lens is equal to zero, and the focal length and the physical length of the triplet lens are kept constant as constraints, an algebraic technique for optimizing a triplet lens is derived. Results show that this new optimizing technique is more effective than other conventional techniques for optimizing a triplet lens in the case of plane waves.

关键词： lens design Electronic filtering Monochromatic aberrations Refractive index Spherical lenses Geometrical optics optical design optical properties Physics Image quality

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FISHEYE PROJECTION lens FOR LARGE-FORMAT FILM

FISHEYE PROJECTION LENS FOR LARGE-FORMAT FILM

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Conference on current developments in optical design and optical engineering III

作者： DOSHI, R HUGHES LEITZ OPT TECHNOL MIDLAND L4R 2H2ONCANADA

In this paper, we present a new fisheye projection lens for 8 perforation 70 mm format film. The lens has an aperture of F/2.4 and a total field of view of 163 degree(s). We discuss design considerations, and compare ... 详细信息

ISBN: (纸本)081941249X

关键词： Modulation transfer functions Distortion lens design Projection systems Glasses Tolerancing Laminated object manufacturing Optics manufacturing Spatial frequencies Manufacturing

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current developments in optical design and optical engineering III

Current Developments in Optical Design and Optical Engineeri...

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current developments in optical design and optical engineering III

The proceedings contains 44 papers. Some of the specific topics discussed are: multiple-temperature lens design optimization;engineering an agile beam director for laser radar;beam design of a noncooperative interfero... 详细信息

ISBN: (纸本)081941249X

关键词： optical systems

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