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

共 444 条记录，以下是111-120 订阅

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Practical guide to saddle-point construction in lens design

Practical guide to saddle-point construction in lens design

引用

conference on current developments in lens design and optical engineering VIII

作者： Bociort, Florian van Turnhout, Maarten Marinescu, Oana Delft Univ Technol Opt Res Grp Lorentzweg 1 NL-2628 CJ Delft Netherlands

ISBN: (纸本)9780819468154

Saddle-point construction (SPC) is a new method to insert lenses into an existing design. With SPC, by inserting and extracting, lenses new system shapes can be obtained very rapidly, and we believe that, if added to the optical designer's arsenal, this new tool can significantly increase design productivity in certain situations. Despite the fact that the theory behind SPC contains mathematical concepts that are still unfamiliar to many optical designers, the practical implementation of the method is actually very easy and the method can be fully integrated with all other traditional design tools. In this work we will illustrate the use of SPC with examples that are very simple and illustrate the essence of the method. The method can be used essentially in the same way even for very complex systems with a large number of variables, in situations where other methods for obtaining new system shapes do not work so well.

关键词： optical system design optimization saddle points

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Tunable GRIN PDMS-made lenses with aspheric profile 19

Tunable GRIN PDMS-made lenses with aspheric profile

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19th conference on current developments in lens design and optical engineering

作者： Reyes-Perez, Emilio R. Cruz-Felix, Angel S. Santiago-Alvarado, Agustin Marquez-Garcia, Josimar Technol Univ Mixteca Inst Phys & Math Carretera Acatlima Km 2-5 Huajuapan De Leon 69000 Oax Mexico

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

Previously, we have studied the behavior of PDMS samples with variation of its synthesis parameters and it has been shown that there exists a direct relation with the variation of its physical parameters such as its refractive index. This property is useful to develop a surface with variable refractive index. In this work we present the design and study of a refractive surface PDMS-made multilayer lens with aspheric profile. The lens has been mounted into a mechanical mounting system to introduce low order aberrations.

关键词： Tunable lens GRIN lens aspheric profile crystalline lens

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Material selection for an achromatic and athermal design using the factor of determination on optical glasses 20

Material selection for an achromatic and athermal design usi...

引用

conference on current developments in lens design and optical engineering XX

作者： Lim, Tae-Yeon Kim, Kum-Ho Park, Sung-Chan Dankook Univ Dept Phys 119 Dandae Ro Cheonan Si 31116 Chungcheongnam South Korea

ISBN: (数字)9781510629028

ISBN: (纸本)9781510629028

This study presents a new method for selecting a pair of optical glass and housing material to achromatize and athermalize a lens system, by use of the factor of determination for material selection. To effectively obtain an optimum combination for materials, we newly propose the sequential material selection method by introducing the factor of determination for material selection, which depends on the level of contribution to correct these aberrations and the availability to be used as a suitable material. Even though there are many cases for material combinations, we can sequentially identify the best pair of glass and housing materials by checking the factor of determination. Using this design approach, we efficiently obtain an achromatic and athermal system through an optimum combination of materials, over the specified ranges in temperature and waveband.

关键词： lens design athermalization achromatization graphic solution

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An easy way to relate optical element motion to system pointing stability - art. no. 62880I

An easy way to relate optical element motion to system point...

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conference on current developments in lens design and optical engineering VII

作者： Burge, J. H. Univ Arizona Coll Opt Sci Tucson AZ 85721 USA

ISBN: (纸本)0819463671

The optomechanical engineering for mounting lenses and mirrors in imaging systems is frequently driven by the pointing or jitter requirements for the system. A simple set of rules was developed that allow the engineer to quickly determine the coupling between motion of an optical element and a change in the system line of sight. Examples are shown for cases of lenses, mirrors, and optical subsystems. The derivation of the stationary point for rotation is also provided. Small rotation of the system about this point does not cause image motion.

关键词： optical alignment optomechanics pointing stability geometrical optics

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Scene-based sensor modeling using optical design software

Scene-based sensor modeling using optical design software

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conference on current developments in lens design and optical engineering VIII

作者： Fisher, John Brandywine Opt Inc Chester PA USA

ISBN: (纸本)9780819468154

The traditional approach to optical system engineering separates the scene, optics, and detector as static entities, optimizing the design to meet subsystem specifications of aperture, field size, encircled energy, read noise, dynamic range, and other electro-optical properties. The Scene-Based Sensor Model (SBSM) represents a different approach by simulating the scene, optics and detector as a cohesive model using commercially available optical ray-tracing software. The objects are modeled as temporally changing entities, with characteristics including reflectance, absorbance, fluorescence, and scattering. Likewise, the detectors are modeled with their properties of temporal noise, spatial non-uniformity, nonlinear gain, and offset drift. The end-to-end simulation produces "photons-to-bits" analysis applicable to a variety of optical systems. First results are illustrated with ray tracing simulation of moving fluorescent objects and laser induced breakdown spectroscopy.

关键词： optical system design ray-tracing simulation sensor model FRED optical design software Matlab

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Achrotech: achromat cost versus performance for conventional, diffractive and GRIN components 17

Achrotech: achromat cost versus performance for conventional...

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conference on current developments in lens design and optical engineering XVII

作者： Morris, Jeffrey Wolf, Greg Vandendriessche, Stefaan Sparrold, Scott Edmund Opt 6464 E Grant Rd Tucson AZ 85711 USA Edmund Opt 101 East Gloucester Pike Barrington NJ 08007 USA

ISBN: (数字)9781510602861

ISBN: (纸本)9781510602854;9781510602861

An achromatic component shares a common focus at two wavelengths and is a commonly used device in optical assemblies. This work explores the cost versus performance tradeoff for several types of achromatic lenses: conventional doublets with homogenous glass elements, hybrid doublets with a diffractive surface, axial GRadient INdex (GRIN) lenses (where the index of refraction changes along the length of the lens), and radial GRIN lenses (where the index of refraction changes depending on radial position). First order achromatic principles will be reviewed and applied to each system as a starting point and refined through the use of ray trace software. optical performance will be assessed in terms of focusing efficiency and imaging. Cost will then be evaluated by accounting for current manufacturing costs and retail price through several distributors.

关键词： achromat GRIN lens diffractive lens axial color longitudinal color spherochromatism lens design

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Graphically selecting optical components and housing material for color correction and passive athermalization

Graphically selecting optical components and housing materia...

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conference on current developments in lens design and optical engineering XIII

作者： Schwertz, Katie Dillon, Dan Sparrold, Scott Edmund Opt Tucson AZ USA

ISBN: (纸本)9780819492036

This paper will demonstrate a graphical method for selecting a pair of optical components to simultaneously achromatize and passively athermalize an imaging lens for use in a housing with a particular coefficient of thermal expansion. The effort will be presented for a generic spectrum, so readers may apply the method to whatever waveband and set of materials that are of interest. The term "component" is used in place of "material" since this paper will explore combinations of refractive and diffractive optics. The method for creating an achromat with two refractive materials will be reviewed. To create an athermal doublet, or lens that does not change focus under temperature changes, the same color equations are used with a slight modification to include housing thermal effects. The paper will culminate by demonstrating how a set of two materials can be used to both color correct and passively athermalize a single lens;these materials can be quickly chosen to match a particular housing material via nomograph. A sample chart for a common waveband will be demonstrated.

关键词： lens design optical design passively athermal thermal defocus achromatic graphic solution

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Method for designing optical systems from the off-the-shelf optical components 23

Method for designing optical systems from the off-the-shelf ...

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conference on current developments in lens design and optical engineering XXIII Part of SPIE Optics and Photonics conference

作者： Ryzhikov, Lev 136 Newtown Ave Unit 7 Norwalk CT 06851 USA

ISBN: (纸本)9781510654198;9781510654181

Several off-the-shelf optical lenses and lens components are available for use in the design of new optical systems. But there isn't a clear methodology on how effective there can be in a real optical device. It should be noted that the use of standard optical elements reduces the cost of the optical device, which is especially important for mass production. Ease and speed of replacement are also important parameters for the usability of standard optical elements. That is why the extensive use of purchased optical elements in optical devices will simplify their operation and improve the convenience of maintenance. Selecting purchased optical components of an optical circuit is not an easy task and requires certain skills. The main problem is that the optical design stage is divided into two parts. The first part is the creation of an optical circuit from non-standard (custom) optical components with optical characteristics close to cataloging lenses. The second part is to adjust the position of the optical component to satisfy specification requirements. This process sometimes required several iterations. For the process of fitting distances in an optical system to be successful, it is necessary to take into account the properties of optical glasses such as refractive index and dispersion when choosing lens components, in addition to their focal lengths and geometrical dimensions. It should be noted that in the catalogs of optical components there are optical parameters of lenses, and also glass parameters of the lens. This is essential information for lens designers to substitution the custom optical element for the off-the-shelf lens. Problems that arise with such a replacement are based on a limited number of standard lenses and lens components. To get comfortable for replacement, the custom lenses components must be modified (adjusted) so that optical parameters will be close enough to the parameters of the catalog lenses other words during the custom lenses opt

关键词： optical components lenses Glasses optical design Relays Head Aberration correction lens design Refractive index Tolerancing

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design of an in-vivo microscope to characterize cataracts in human eyes 6

Design of an in-vivo microscope to characterize cataracts in...

引用

current developments in optical design and engineering VI conference

作者： Feng, C Ahmad, A Univ. of Alabama in Huntsville (United States)

ISBN: (纸本)0819422517

The design of a compact contact microscope, which can be used in-vivo to study the cataracts in human eyes is presented. This microscope has the capability to evaluate the changes in the optical density within the eye lens itself, and thus enabling an examiner to ascertain the progression of a cataractous change or at least the optical changes associated with cataractous development. The microscope has a variable focal length so it can be focused at any depth through the entire thickness of the eye lens. A separate small objective lens is spring loaded against the cornea (like a tonometer tip) so that the natural eye movements can occur safely during the examination. The distance between the objective lens and rest of the optics is variable to accommodate the movements of the eye due to pulse or breathing without affecting the image quality of the instrument. The layer by layer images can be captured on a CCD camera and stored in the computer. The reconstruction software can quantitatively display the characteristics of the cataracts, such as the location, size, and density. The optical design and performance results for the microscope are presented. The optomechanical design features of the microscope are also discussed.

关键词： in-vivo microscope contact microscope eye diseases cataracts CCD imaging

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optical design of a reflectance/Raman confocal microspectrometer

Optical design of a reflectance/Raman confocal microspectrom...

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conference on current developments in lens design and optical engineering III

作者： Mouroulis, P CALTECH Jet Prop Lab Pasadena CA 91109 USA

ISBN: (纸本)0819445347

A miniaturized instrument for systematic planetary mineralogy is presented, and the optical design of the component parts is discussed. The instrument combines the following capabilities: wide field color imaging, confocal imaging at two different resolution/range levels, reflectance spectroscopy in the 400-2500 nm region with a resolution of 10 nm, and Raman spectroscopy over 4000 cm(-1) with an average resolution of 3.3 cm(-1). The instrument can also serve as an expandable platform for adding fluorescence spectroscopy, or for examining samples from a distance of several meters while using the same spectrometer.

关键词： optical design confocal microscopy planetary mineralogy reflectance spectroscopy Raman spectroscopy

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