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

共 446 条记录，以下是121-130 订阅

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Calibration of 3D ring lens systems

Calibration of 3D ring lens systems

引用

8th conference on current developments in optical design and optical engineering

作者： Ahmed, YA Afifi, H Rubino, G ENST Bretagne Networks & Multimedia Serv Dept F-35512 Cesson Sevigne France

ISBN: (纸本)0819432652

We have designed a new kind of 3D image capture system based on a new 3D ring lens(1). In this paper we represent a calibration procedure for this kind of systems using the information from the surrounding environment. It is mainly based on motion in one direction with known value and establishing the correspondence between the successive views to derive system parameters. The main differences between calibration of the traditional stereo systems and the new one are also discussed.

关键词： stereo epipolar geometry camera calibration self-calibration projection matrix fundamental matrix 3D lens and camera models

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Gain in optical Coatings

Gain in Optical Coatings

引用

conference on current developments in lens design and optical engineering XIII

作者： Macleod, Angus Clark, Christopher Thin Film Ctr Inc Tucson AZ 85716 USA

ISBN: (纸本)9780819492036

The introduction of gain into an optical medium is most easily accomplished by reversing the sign of the extinction coefficient. The theoretical expression for reflectance at a simple boundary between a dielectric, lossless incident medium and a medium with a finite extinction coefficient, however, takes no account of the sign of the extinction coefficient In such an arrangement, therefore, can the presence of gain possibly result in an enhanced reflectance? Opinions in the literature differ but tend to find enhancement beyond the critical angle and none below. This study examines both cases and shows that all results are in fact correct but they are not necessarily stable and it is their stability, or lack of it, that leads to the different results.

关键词： Gain in optical coatings optical coating theory admittance loci with gain

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Multiagent System in Automatic Light Power Balance in optical Networks

Multiagent System in Automatic Light Power Balance in Optica...

引用

conference on current developments in lens design and optical engineering XIV

作者： Slapak, Martin Hula, Milislav CESNET Ale Prague 16000 6 Czech Republic

ISBN: (纸本)9780819496911

This article deals with automatic power balancing along an optical line. For optimal transmission of an optical signal it is important to achieve certain parameters such as the signal to noise ratio orchromatic dispersion and also the sufficient output power level of in-line amplifiers. Pump diodes in amplifiers suffer from aging of material and therefore the driving current of pump diodes has to be accordingly increased to achieve the same gain as in the moment when the pump diodes were new. The use of a minimal required driving current leads to the longer lifetime of optical pumps. Therefore an automatic power balance is one of the methods used to achieve these goals.

关键词： Multiagent system automatic power balance gain control

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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

引用

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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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...

引用

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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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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Scene-based sensor modeling using optical design software

Scene-based sensor modeling using optical design software

引用

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...

引用

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...

引用

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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