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

共 444 条记录，以下是181-190 订阅

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Third-order aberration solution using aberration polynomials for a general zoom lens design

Third-order aberration solution using aberration polynomials...

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conference on current developments in lens design and optical engineering VIII

作者： An, Hyun Kyoung Rayces, Juan L. Reardon, Patrick J. Univ Alabama Ctr Appl Opt Huntsville AL 35899 USA JL Rayces Consulting Tucson AZ 85718 USA

ISBN: (纸本)9780819468154

A mathematical approach for the third order solution for a general zoom lens design is proposed. The design starts with a first-order layout. lens elements with the proper refracting power are placed at the proper distances to meet the physical constraints of the intended lens system. For the third-order design stage, a matrix notation called "Aberration Polynomial," which clarifies the linearity of the transformation from a normal thin group configuration to a general thin,group configuration by pupil shift and conjugate shift theory is implemented. The purpose of the method is correcting low-order aberrations during the preliminary design of zoom lenses. The goal is to mathematically reduce to zero the four aberration coefficients of the third-order (spherical aberration, coma, astigmatism, and distortion) rather than searching for a minimum by commercial design software. Once this theory is proven and accepted, it becomes possible to determine how many groups are needed for a particular optical system. The method of aberration polynomials establishes the number of groups needed to correct a given number of aberrations at a Given number of zoom positions. Furthermore, it provides the shape or bending of the elements, from where it will be possible to continue to optimize with standard methods.

关键词： Zoom lenses Monochromatic aberrations lens design Chemical elements Distortion Astatine Patents Geometrical optics Spherical lenses optical engineering

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design of a dual field-of-view optical system for infra-red focal-plane arrays

Design of a dual field-of-view optical system for infra-red ...

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conference on current developments in lens design and optical engineering III

作者： Akram, MN Royal Inst Technol Dept Microelect & Informat Technol SE-16440 Stockholm Sweden

ISBN: (纸本)0819445347

In this paper, the design of a dual field-of-view optical system for 3-5 mum infra-red focal-plane arrays is described. Preliminary calculations are done to determine the first-order parameters of the narrow and the wide-field modes. To achieve a switchable dual field-of-view system, two different optical configurations, one based on the axial motion of a lens group and the other based on a rotate-in motion of two separated lens groups, are studied and compared. Diffractive and conic surfaces are used to control the color and the monochromatic aberrations with less number of total lenses used. Paraxial and real-ray modelling of the Narcissus effect is described. It is shown that the rotate-in scheme achieves better optical performance in both the narrow and the wide-field modes. The axial-motion scheme suffers from poor lateral color in the wide-angle mode. The final optical designs along with their aberrations curves and MTF plots are presented showing excellent performance.

关键词： lens design infrared optics diffractive optics dual field-of-view focal-plane-arrays (FPA)

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An endoscopic lens with internal focusing 23

An endoscopic lens with internal focusing

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

作者： Rehn, Henning Forrer, Hans Mehne, Christian Betke, Alexander Bobic, Neven Schumm, Tobias Graf, Christian Klein, Kirsten Hein, Simon Miernik, Arkadiusz FISBA AG Rorschacher Str 268 CH-9016 St Gallen Switzerland FISBA Photon GmbH Schwarzschildstr 12 D-12489 Berlin Germany Actuator Solut GmbH Richard Stucklen Str 19 D-91710 Gunzenhausen Germany KARL STORZ SE & Co KG Dr Karl Storz Str 34 D-78532 Tuttlingen Germany Univ Freiburg Med Ctr Fac Med Dept Urol Hugstetter Str 55 D-79106 Freiburg Germany

ISBN: (纸本)9781510654198;9781510654181

We report optical and optomechanical design of a new endoscopic system for the urinary bladder. On the basis of the specification, key requirements of the optics are derived. The required high resolution goes hand in hand with a depth of field much smaller than the intended object distance range and raises the need for image focusing. Such a focus mechanism was realized in the small endoscope tip volume with the help of smart memory alloy wires and a matching optical and mechanical design. MTF measurements and practical tests demonstrate a proper function of a prototype of the device.

关键词： Endoscope lens Chip on Tip Internal Focusing

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Distortion controlled optical design using orthogonal surface polynomials 11

Distortion controlled optical design using orthogonal surfac...

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conference on current developments in lens design and optical engineering XXI

作者： Allain, Guillaume Thibault, Simon Ctr Opt Photon & Laser Quebec City PQ Canada Univ Laval Dept Phys Genie Phys & Opt Quebec City PQ Canada

ISBN: (数字)9781510637719

ISBN: (纸本)9781510637719

The design of high quality very wide-angle optical systems (FFOV > 100 degrees) relies on distortion to obtain a sufficient resolution at, usually, the center of the field of view. Using distortion shape as a parameter during optimization to reach a magnification target is a common technique to achieve optical foveation during the lens design process. This method allows resolution enhancement at selected parts of the field of view since less care is given to parts of the image that are deemed less important. However, accurate control of distortion can be a challenge during optical design since the standard aspherics polynomials don't correlate directly to image magnification. This may in fact slow down optimization since the merit function is much less optimized to approach a solution. In this paper, we address this problem by presenting a method to simplify distortion control during the optical design phase. To achieve this, the use of orthogonal polynomials is used for defining the optical surface shape and will then be used to compare the height of the image plane at a given field of view. We show that in the case of simple and paraxial system, this process is orthogonal and achieve a solution in a single optimization step. We will finally discuss the limits of this method and how it applies to modern lens design problems.

关键词： optical design Foveated imaging Distortion Control Orthogonal polynomials Shape specification

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The design, Construction and Characterization of a Solid Elastic lens

The Design, Construction and Characterization of a Solid Ela...

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conference on current developments in lens design and optical engineering IX

作者： Santiago-Alvarado, A. Vazquez-Montiel, S. Iturbide-Jimenez, F. Arriaga-Martinez, R. Gonzalez-Garcia, J. UTM Inst Fis & Matemat Carretera Acatlima Km 2-5 Huajuapan Leon Oaxaca Mexico City 6900 DF Mexico INAOE Inst Opt Santa Maria Tonantzintla Pu Mexico UTM Inst Diseno Mexico City 6900 DF Mexico

ISBN: (纸本)9780819472809

Recent times have seen the production of normal and micro liquid lenses with variable focal length. These have been specially made with transparent elastic materials and liquid medium between them, or with a dielectric liquid medium inside the cavity. Change in the volume of the liquid medium, in the first case, or the application of an electric field as in the second, produced a change in the optical parameters of the lens. The present study offers the opto-mechanical design, manufacture and characterization of a solid elastic lens made of Polydimethylsiloxane (PDMS). To do so, we have prepared a mechanical support frame to hold all of the components of the lens and also allow for the application of radial stress on its periphery. In order to ensure a well-finished lens surface a high quality optical glass mold has also been constructed. Finally, we will present an analysis of the properties of this type of lens when it undergoes variations of radial stress. The experimental results are presented.

关键词： Adaptive lens Opto-mechanical design Elastic lens

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Barium Fluoride and glass combinations for short-wave infrared designs

Barium Fluoride and glass combinations for short-wave infrar...

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conference on current developments in lens design and optical engineering XI - and Advances in Thin Film Coatings VI

作者： Warren, D. W. Aerosp Corp Visible & Infrared Sensor Syst Dept Los Angeles CA 90009 USA

ISBN: (纸本)9780819482822

Achromatic doublet theory is recast for the 1-2.5 mu m short-wavelength infrared band, suggesting the desirability of combining barium fluoride with specific high index optical glasses having large differences in primary SWIR dispersion and small differences in partial SWIR dispersion. Candidate combinations of materials are screened empirically using the performance of optimized f/3 airspaced achromatic doublets employing barium fluoride as the positive element. Polychromatic RMS geometric image spot sizes appear to increase quadratically with difference in partial SWIR dispersion between barium fluoride and the complementary glasses. Examples of complex (fast, wide field) systems demonstrate the utility of the most promising combinations.

关键词： lens design infrared barium fluoride achromatic astronomy

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Development of fast camera objective for spectrograph of Mont Megantique telescope

Development of fast camera objective for spectrograph of Mon...

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conference on current developments in lens design and optical engineering V

作者： Thibault, S Wang, M Bernier, S INO Opt Design Grp St Foy G1P 4S4 PQ Canada

ISBN: (纸本)0819454613

A fast (F/1.55) and wide-angle refractive camera objective has been developed to work with a large-size CCD on the focal plane of the spectrograph of Mont Megantique telescope for large spectral coverage from UV to VIS and up to NIR. The novel camera objective has been designed and optimized with three different glass combinations in order to have higher throughputs for large spectral coverage, especially in UV region. The tolerance analysis of the camera objective is given in the paper. The final opto-mechanical design of the objective is discussed with the consideration of the manufacturing tolerance in the optical and mechanical parts, as given in this paper. The used components have been minimized to reduce the light inherent lost. The optical testing results displayed the good optical performance of the camera with the required resolution for the whole FOV, as predicted by the optical simulation and computation. The broadband AR coating, enhanced on UV region, have been used on each surface of the lenses in the optical system.

关键词： optical engineering fast spectrograph camera opto-mechanical design astronomical instrumentation

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Achieving multiple beam patterns using 3-D printed lens by changing the position of LEDs 23

Achieving multiple beam patterns using 3-D printed lens by c...

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

作者： Udage, Akila S. Narendran, Nadarajah Rensselaer Polytech Inst Lighting Res Ctr 21 Union St Troy NY 12180 USA

ISBN: (纸本)9781510654198;9781510654181

As lighting has diversified across many applications, optical designers have been challenged to produce application-specific optical systems. For an instance where multiple beam distributions are required in an application, instead of making individual lenses catering to different beam shapes, it would be beneficial to create a single optic that can be used with different LED source positioning. Hence, this study proposes a method of positioning LEDs in a fixture to achieve multiple beam patterns using a fixed lens design. Through ray-tracing analysis, we showed that different beam distributions could be obtained by changing the LED position in a refractive lens array. The experimental study was conducted with a 3D-printed lens to validate the model. The results confirm the possibility of creating a single fixed lens to achieve multiple beam distributions via different LED positioning. The proposed novel method can replace the expensive and cumbersome process of developing separate lenses for each beam distribution. Further, our experimental results can guide fixture manufacturers on the use of 3D-printed optics for lighting applications.

关键词： Beam shaping Multiple beams Lighting 3D printing Optics Additive manufacturing

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Combining the transformation and the integration methods to design a refractive lens-array for signal lighting applications 18

Combining the transformation and the integration methods to ...

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conference on current developments in lens design and optical engineering xviII

作者： Essameldin, Mahmoud Fleischmann, Friedrich Henning, Thomas Lang, Walter Bremen Univ Appl Sci Fac Elect Engn & Comp Sci 30 Neustadtswall D-28199 Bremen Germany Univ Bremen Inst Microsensors Actuators & Syst Otto Hahn AlleeGebaude NW 1 D-28359 Bremen Germany

ISBN: (纸本)9781510612082;9781510612075

The design of a secondary optical lens for light beam shaping using the transformation method is performed by transforming the light source energy distribution using the concepts of energy conservation and light energy mapping. Using these concepts creates a dependency relation between the output optical performance and the luminous intensity distribution of the light source. This relation leads to errors on the optical performance due to the fabrication misalignment between the light source and the secondary optical lens. On the other hand, in the illumination applications, the integration method has been proved to be an efficient method for achieving a high degree of homogenized luminous intensity distribution by integrating and superimposing the light source energy over the illuminated objects. In signal lighting applications, the luminous intensity distribution must meet the requirements regarding the brightness perception of users over the spatial angular distribution, not the illumination of objects. In this paper, the integration method is combined with the transformation method to design a refractive lens-array for signal lighting applications. The difference between the two methods is described, presenting the advantages of the combination process. design procedures are explained in detail including the lens-array modeling. The optical performance is investigated using an optical ray tracing. Finally, the influence of the misalignment between the light source and the refractive lens-array is measured.

关键词： optical design Signal Lighting Beam-shaping

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Estimating the factors restricting potential dynamic range in the optical scheme of acousto-optical spectrometer for the Mexican Large Millimeter Telescope

Estimating the factors restricting potential dynamic range i...

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conference on current developments in lens design and optical engineering VIII

作者： Shcherbakov, Alexandre S. Mata, Sandra E. Balderas Lucero, D. Sanchez Natl Inst Astrophys Opt & Elect AP 51 & 216 Puebla 72000 Mexico

ISBN: (纸本)9780819468154

Here, we consider one of the most important problems related to optimizing the performance data of a new acousto-optical spectrometer for the analysis of radio-astronomical signals. The main attention is paid to estimating two factors governing the dynamic range of that spectrometer. At first, we determine the influence of the acoustic attenuation along a large-aperture acousto-optical cell on potential levels of lobes in focal plane of the integrating lens and then describe capabilities of the incident light beam apodization for increasing the dynamic range of spectrometer. These studies lie in a line with the program of developing metrological equipment for Mexican Large Millimeter Telescope.

关键词： acousto-optics dynamic range large-aperture acousto-optical cell acoustic attenuation beam apodization

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