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

共 444 条记录，以下是141-150 订阅

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Analysis of double conjugate zoom lens using tunable-focus lenses 15

Analysis of double conjugate zoom lens using tunable-focus l...

引用

conference on current developments in lens design and optical engineering XV

作者： Novak, Jiri Novak, Pavel Miks, Antonin Czech Tech Univ Fac Civil Engn Dept Phys Prague 16629 6 Czech Republic

ISBN: (纸本)9781628412192

The work is focused on an analysis and modeling of paraxial imaging parameters of an optical system with a variable magnification or focal length, which keeps the position of object and image planes and entrance and exit pupil planes fixed. This system does not move its elements during the change of the magnification or the focal length. Such an effect can be achieved using tunable-focus active lenses. The described double conjugate zoom lens with tunable-focus lenses satisfies the requirement that object, image and pupil planes are fixed during the change of magnification or focal length. The system must be composed of at minimum three optical elements. Formulas are derived, which enable to determine focal lengths of individual elements of the optical system in a general case, when an object is situated in a finite or infinite distance from the optical system. Such an optical system can be principally used in the design of riflescopes with a variable magnification. This design of the riflescope has the advantage of the fixed position of its optical components (tunable-focus lenses). Further, the position of the exit pupil does not change and stays fixed in a fixed distance from the eyepiece during the change of magnification.

关键词： zoom lens tunable-focus lenses optical imaging first order optics riflescope

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Accurate camera performance prediction using optical and imaging simulation pipeline for super wide-angle lens 23

Accurate camera performance prediction using optical and ima...

引用

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

作者： Buquet, J. Larouche, R. Parent, J. Roulet, P. Thibault, S. Immervision 2020 Blvd Robert Bourassa Montreal PQ H3A 2A5 Canada

ISBN: (纸本)9781510654198;9781510654181

optical design process consists in minimizing aberrations using optimization methods. It relies on key performance indicators (KPIs), such as point spread function (PSF), Modulated transfer function (MTF), or relative illumination (RI) and spot sizes, that depend on lens elements aberrations. Their target values need to be defined -either for human or machine perception- at early stage of the design, which can be complex to do for challenging designs such as extended field of view. We developed an optical and imaging simulation pipeline able to render the effects of complex optical designs and image sensor on an initial aberration-free image. Extracting files from ray tracing software for simulating the PSF and sensor target information, the algorithm accurately renders off-axis aberrations with Zernike polynomials representation combined with noise contribution and relative illumination. The obtained image faithfully represents an optical system performance from the optics to the sensor component and we can then study the impact of additional aberration introduction.

关键词： End-to-End design spatially varying PSF wide angle image simulation

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Large-format telecentric lens

Large-format telecentric lens

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conference on current developments in lens design and optical engineering VIII

作者： Bai, Hanxiang Sadoulet, Samuel P. Edmund Opt Inc 101 E Gloucester Pike Barrington NJ 08007 USA

ISBN: (纸本)9780819468154

Research and development efforts to improve the performance of telecentric lens design for large-format cameras are driven by the ever-increasing deployment of these types of systems into the industrial Imaging arena. These lens designs typically have stringent requirements for contrast and resolution (> 30% at 1001p/mm) across large sensor sizes (up to 90mm) while maintaining both object- and image-space 91 telecentricity (0.1 degrees object-space, 0.2 degrees image-space). This paper explores various characteristics related to large-format telecentric lens designs and performance. In particular, details around advantages of afocal finite-conjugate imaging, mathematic expression for chromatic telecentricity, and desensitization of working distance variance are discussed with reference to geometric optics and aberration theory. Improvement of chromatic telecentricity and relief of requirement on image-distance accuracy are shown with graphics and MTF plots. Product parameter performance data is provided as an example.

关键词： large-format telecentric lens double telecentric lens telecentric lens large format machine vision lens telecentricity chromatic telecentricity afocal optical system desensitization

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Replication optics for a holographic 3D display system

Replication optics for a holographic 3D display system

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conference on current developments in lens design and optical engineering IV

作者： Wood, A Smith, M Stanley, M Thales Opt Ltd St Asaph LL17 0LL Denbigh Wales

ISBN: (纸本)0819450464

The display of 3D images containing all the depth cues required by the human vision system can be achieved using a reconfigurable Computer Generated Hologram (CGH) with high pixel count. A technique which has been developed to produce CGH's with the required number of pixels, and at video refresh rates, is known as Active Tiling((TM)) (AT). At the heart of an AT system is a set of replication optics which produces multiple images of a Spatial Light Modulator (SLM) onto the CGH. The design of two alternative optical systems for generating a 5x5 tiled array of de-magnified images of a single object is discussed. Results are presented from a 4-channel AT system which has recently been built and demonstrated.

关键词： optical design computer generated holograms 3D display

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A new method to treat a spherical lens as a combination of two perpendicular lengthless cylindrical lenses in ray tracing

A new method to treat a spherical lens as a combination of t...

引用

conference on current developments in lens design and optical engineering IV

作者： Al-Ali, LS Rasheed, KH Ajman Univ Sci & Technol Ajman U Arab Emirates

ISBN: (纸本)0819450464

We present a new suggestion for treating skew rays. In the new suggestion. we hypothetically divide a spherical lens. at each point of intersection of the incident rays with the spherical lens. into two effective perpendicular lengthless cylindrical lenses. One of the hypothetical cylindrical lenses is effective in the vertical direction while the other is effective in the horizontal direction. A method is given for calculating the resulted vertical and horizontal angles of refraction. After calculating these angles one can combine. at that point of incidence. the two components into a vector sum to find the resultant refracted ray. The new suggested method is first discussed and demonstrated for one single lens. and then generalized to optical systems of many components. The method's power and effectiveness in lens and optical systems design is demonstrated. A software package is designed and written for the purpose of optical ray tracing. The new method is implemented in this software. The name we gave to this package is "CALOSD". CALOSD is an acronym for Computer Aided lens and optical Systems design. CALOSD is capable of producing very accurate tabulated data as well as graphical displays of an optical system and rays traced from different points or angles of view: including a top view.

关键词： lens design ray tracing meridian and skew rays approximate and exact methods

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Analysis and design of an adaptive lens

Analysis and design of an adaptive lens

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conference on current developments in lens design and optical engineering VII

作者： Santiago-Alvarado, A. Vazquez-Montiel, S. Gonzalez-Garcia, J. Garcia-Luna, V. M. Fernandez-Morena, A. Vera-Diaz, E. UTM Inst Fis & Matemat Huajuapan Leon Oaxaca 6900 Mexico INAOE Inst Opt Puebla Mexico

ISBN: (纸本)0819463671

This study presents the design and analysis of a lens with a variable focal length, which we will call an adaptive lens. This lens is formed of two transparent elastic surfaces with a transparent liquid medium between them. The mechanical design of the lens considers the variation of liquid pressure between the surfaces. This causes changes in curvature radii and in the axial thickness, generating variations in the focal length of the lens. An analysis is given of changes in lens power with respect to changes in pressure. Finally, a model of the human eye is presented using this adaptive lens as crystalline.

关键词： adaptive elastic surfaces liquid lens model human eyes

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optical design process of a human eye inspired lens 23

Optical design process of a human eye inspired lens

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

作者： Allain, Guillaume Thibault, Simon Univ Laval Fac Sci & Genie Dept Phys Genie Phys & Opt 1045 Ave Med Laval PQ G1V 0A6 Canada COPL 2375 Rue Terrasse Quebec City PQ G1V 0A6 Canada

ISBN: (纸本)9781510654198;9781510654181

Bio-inspired optical design can be described as a conscious decision in the design process to take inspiration from physical adaptation that were brought up by natural selection. The usual goal is to introduce non-conventional techniques or material in order to achieve better performance or novel applications. However, when the target is to imitate closely the form-factor, appearance and optical properties of a biological system, new requirements are added to the design process and new problems arises. In this paper, we will expose the design of an optical system that draws most requirements from both the optical properties and the form-factor of the human eye. However, contrary to human eye models, the main requirements for this project is to make a realistic design which can be assembled as a prototype. The design process will be laid out, by firstly introducing system requirements and various performance targets that comes from the bio-inspired design. The constraints associated with using entrance pupil's appearance as a requirement will be presented. This paper will also specifically be looking at distortion as a solution for modulating resolution throughout the field of view and as a tool to aid in those novel problems.

关键词： optical design Bio-inspired design Human eye optical design methodology optical Distortion

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Simultaneous color-mixing and collimation within LED package

Simultaneous color-mixing and collimation within LED package

引用

conference on current developments in lens design and optical engineering XIV

作者： Moreno, Ivan Rodriguez, Nayeli Carlos Basilio, Jose Univ Autonoma Zacatecas Unidad Acad Fis Zacatecas 98060 Mexico

ISBN: (纸本)9780819496911

A compact encapsulating lens is proposed and analyzed, which simultaneously collimates and mixes the tunable light from red, green and blue (RGB) light-emitting diode (LED) chips. Colored LED chips are embedded within a spherical lens, and a section of the sphere that surrounds chips is mirrored with a diffuse reflector. Color light is mixed by multiple total internal reflections (TIRs), the scattering mirror breaks TIR, and light escapes only in a narrow beam in the forward direction. The color distribution, the beam pattern, and efficiency are analyzed by Monte Carlo ray tracing calculations.

关键词： Encapsulating lens Light Projection Mix of Color Illumination Spotlights

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Achieving linearity with an optical quadrant detector tracking system 18

Achieving linearity with an optical quadrant detector tracki...

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conference on current developments in lens design and optical engineering xviiI

作者： Doherty, Victor J. Aouani, Dina Eidolon Opt LLC 3 Erie Dr Natick MA 01760 USA

ISBN: (纸本)9781510612082;9781510612075

Conventional round spot quadrant detector trackers are inherently non-linear. This non-linearity requires multiple iterations to converge onto perfect alignment with the object tracked. We created a system that generates a square spot. The convolution of a square spot with a circle, generated by the quadrant detector, allows this spot to achieve perfect alignment in one iteration. This invention is thus essential to any system that requires speed and accuracy. In this paper, we introduce the theory behind the square spot as well as the design of our linear optical quadrant detector tracking technology.

关键词： Quadrant Detector optical Tracking Sun Tracking Solar Surgery Square Spot

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Ultra-fast focal reducer design for ∼2m-class telescopes

Ultra-fast focal reducer design for ∼2m-class telescopes

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conference on current developments in lens design and optical engineering V

作者： Beach, D Appl Phys Ltd Christchurch 8153 New Zealand

ISBN: (纸本)0819454613

An ultra-fast focal reducer design originally intended for use with spherical primary mirrors (published in optical engineering, February, 2003), has been adapted for use as a retro-fit for existing telescopes of similar to2m pupil diameter that have aspheric mirrors. The focal reducer has only one aspheric surface, located at the aperture stop, and can provide speeds up to f/0.75 while maintaining a wide field with pixel-limited resolution and a broad spectral passband. Examples have been computed for Ritchie-Chretien, Dall-Kirkham and Cassegrain systems, and for use at the prime focus of mirrors with non-zero conic constants.

关键词： focal reducer high speed high resolution wide angle broad spectral passband retrofit telescopes

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