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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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design of a head-mounted display with freeform mirrors 20

Design of a head-mounted display with freeform mirrors

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conference on current developments in Lens design and optical engineering XX

作者： Rui, Congshan Zeng, Chunmei Hu, Tiantian Ma, Suodong Soochow Univ Sch Optoelect Sci & Engn Suzhou 215006 Peoples R China Soochow Univ Educ Minist China Key Lab Adv Opt Mfg Technol Jiangsu Prov Suzhou 215006 Peoples R China Soochow Univ Educ Minist China Key Lab Modern Opt Technol Suzhou 215006 Peoples R China

ISBN: (数字)9781510629028

ISBN: (纸本)9781510629028

A head-mounted display (HMD) requires a large field of view (FOV) and a large exit pupil diameter while maintaining a compact structure. In this paper, we show a head-mounted display design comprising two freeform mirrors covering a 28 degrees full field-of-view with an eye relief of 15mm. The simplified partial differential equation (PDE) method is applied in the design of a two-mirror HMD system. Then the data points on the unknown freeform mirrors are calculated using the rays from multiple fields and are used to construct the freeform mirrors in the HMD system, which is taken as a starting point. This simplified partial differential equation method makes calculations easier. The anamorphic surface and the XY polynomial freeform surface are used in the two freeform mirrors for improving the image quality, respectively. The optimization strategy is also described in detail. The final HMD system operates at F/3.75 with 8mm exit pupil diameter achieving good imaging performance.

关键词： Geometric optical design mirror system design head-mounted display optical freeform surface

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Agile beam director system design (ROBS/TCATS optical tracker)

Agile beam director system design (ROBS/TCATS optical tracke...

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

作者： Neff, BW Trissel, RG Dunn, M Scotese, L Thermotrex Corp San Diego CA 92121 USA

ISBN: (纸本)0819432652

The ROBS (Rapid optical Beam Steering) tracking telescope was invented and developed at TTC to provide a high acceleration, large aperture beam steering system for rapid pointing to multiple objects. The optical system consists of a fast, oversized spherical primary mirror with the 50 cm aperture stop at the center of curvature of the primary mirror (CCP). A lightweight secondary mirror selects the instantaneous field of view by scanning over the petzval image surface of the primary mirror. The secondary mirror is gimbaled about the CCP on a rigid, lightweight mast. The system's symmetry about the CCP simplifies the optical and mechanical design and provides very rapid retargeting over a 30 degree field of regard for multiple target tracking. Field corrector and pupil relay optics inside the support tube collimate the light through coude' optics to passive sensors and laser radar optics. The 2-sphere, 2-asphere aplanatic, anastigmant all-reflective design corrects the 9.1 mr of spherical aberration from the F/1 primary and provides 10 microradian resolution over a 5 mr field of view. The system incorporates near field focus adjustment to provide high resolution imaging and laser ranging over a large volume of space. Two 50 cm systems have been built and demonstrated tracking multiple targets in the field. This paper describes the opto-mechanical design and demonstrated system capabilities.

关键词： telescope with spherical primary beam steering laser radar system optical tracker

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Caustic surfaces produced by a plane wavefront refracted through cemented doublet lenses 19

Caustic surfaces produced by a plane wavefront refracted thr...

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

作者： Avendano-Alejo, Maximino Carmen Lopez-Bautista, M. Castaneda, Luis Univ Nacl Autonoma Mexico Inst Ciencias Aplicadas & Tecnol Apdo Postal 70-186 Mexico City 04510 DF Mexico Inst Politecn Nacl Escuela Super Med Plan San Luis & Diaz Mirson S-N Mexico City 11340 DF Mexico

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

We study the formation of caustic surfaces produced by cemented doublet lenses, considering a plane wavefront propagating parallel to the optical axis and neglecting the refractive index of the optical cement between two simple lenses which are in contact. We have already seen that the shape of caustic surfaces can represent the monochromatic aberrations that we call image errors;furthermore the shape of the caustic can be modified by changing the parameters of design for two conic lenses in contact, in such a way that if we are able to vanish the caustic, the optical system produces either an image without spherical aberration or longitudinal chromatic aberration reduced, commonly known as spherochromatism. The shape of the caustic surface is a function of the indices of refraction involved in the process of refraction, and all the parameters of two simple lenses. We provide an analytic equation for the caustic surfaces in a meridional plane and an example is presented.

关键词： Caustic Surfaces Cemented doublet lenses optical design Principal Surfaces

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design of a day/night star camera system

Design of a day/night star camera system

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

作者： Alexander, CD Swift, W Ghosh, K Ramsey, B NASA George C Marshall Space Flight Ctr Dept Space Sci Huntsville AL 35812 USA

ISBN: (纸本)0819432652

This paper describes the design of a camera system capable of acquiring stars during both the day and night cycles of a high altitude balloon flight (35-42 km). The camera system will be filtered to operate in the R and I bands (similar to 600-1000nm), and simulations have been run using MODTRAN atmospheric code to determine the worse case sky brightness at 35km. With a worse case daytime sky brightness of 2x10(-5) W/cm(2)/sr/mu m at 600nm, the sensitivity of the camera system will allow acquisition of at least 1-2 stars/degrees(2) at star magnitude limits of 7.8-8.1. The system will have an F2.8, 64.3mm diameter lens and a 1340 x 1037 CCD digitized to 12 bits. The CCD is comprised of 6.8 mu m x 6.8 mu m pixels with a well depth of 45,000 electrons and quantum efficiency of 0.54 at 700nm. The camera's field-of-view will be 6.33 degrees(2) and provide attitude knowledge to 8 arcsec or better. A test flight of the system is scheduled for fall 1999.

关键词： star camera aspect system stratospheric balloon flights daytime star camera R band

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design considerations for an unconventional infrared prism with a 90 degree ray deviation 16

Design considerations for an unconventional infrared prism w...

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conference on current developments in Lens design and optical engineering Xvi

作者： Akarca, Beyza Artan, Goktug Gencehan TUBITAK SAGE Ankara Turkey

ISBN: (纸本)9781628417449

In this study, the optical performance of a 90 degree prism working in the mid-wave infrared region with the purpose of carrying a beam of light from one optical system to another in an unconventional way is discussed. First, a group of mirrors is considered as a design alternative to lower the overall cost of the system. However, using mirrors greatly increases the diameter of the beam due to the rays coming from wide field of view angles. Another drawback of mirrors is that having separate mirrors requires precise alignment for the system to work at full performance which is difficult for the given application. However, these alignment issues are not valid for a single piece prism. Therefore, a single piece prism is the preferred option and has been taken into account in this study. Material selection is important, especially in the mid-wave infrared region where the index of refraction differs greatly from material to material. Silicon and Germanium are the materials preferred because of their high index of refraction and transmission characteristics. Aside from optical properties, these materials are also considered in terms of manufacturability. Also, options for the coatings to be applied to reflecting surfaces of the prism are discussed with regard to the transmission loss within the system. In order to have total internal reflection within a prism, coatings must be chosen carefully to handle transmission loss at the reflecting surfaces. All of the system parameters are examined using sequential and non-sequential modes of ZEMAX OpticStudio software.

关键词： 90 degree prism infrared prism optical design infrared prism

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Plane development of lateral surfaces for inspection systems

Plane development of lateral surfaces for inspection systems

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conference on current developments in Lens design and optical engineering viI

作者： Francini, F. Fontani, D. Jafrancesco, D. Mercatelli, L. Sansoni, P. Ist Nazl Ott Appl L Go E Fermi 6 I-50125 Florence Italy

ISBN: (纸本)0819463671

The problem of developing the lateral surfaces of a 3D object can arise in item inspection using automated imaging systems. In an industrial environment, these control systems typically work at high rate and they have to assure a reliable inspection of the single item. For compactness requirements it is not convenient to utilise three or four CCD cameras to control all the lateral surfaces of an object. Moreover it is impossible to mount optical components near the object if it is placed on a conveyor belt. The paper presents a system that integrates on a single CCD picture the images of both the frontal surface and the lateral surface of an object. It consists of a freeform, lens mounted in front of a CCD camera with a commercial lens. The aim is to have a good magnification of the lateral surface, maintaining a low aberration level for exploiting the pictures in an image processing software. The freeform lens, made in plastics, redirects the light coming from the object to the camera lens. The final result is to obtain on the CCD: - the frontal and lateral surface images, with a selected magnification (even with two different values for the two images);- a gap between these two images, so an automatic method to analyse the images can be easily applied. A simple method to design the freeform lens is illustrated. The procedure also allows to obtain the imaging system modifying a current inspection system reducing the cost.

关键词： optical design freeform optics industrial control optical component

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Multi-aperture microoptical system for close-up imaging 15

Multi-aperture microoptical system for close-up imaging

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conference on current developments in Lens design and optical engineering XV

作者： Berlich, Rene Brueckner, Andreas Leitel, Robert Oberdoerster, Alexander Wippermann, Frank Braeuer, Andreas Fraunhofer Inst Appl Opt & Precis Engn D-07745 Jena Germany

ISBN: (纸本)9781628412192

Modern applications in biomedical imaging, machine vision and security engineering require close-up optical systems with high resolution. Combined with the need for miniaturization and fast image acquisition of extended object fields, the design and fabrication of respective devices is extremely challenging. Standard commercial imaging solutions rely on bulky setups or depend on scanning techniques in order to meet the stringent requirements. Recently, our group has proposed a novel, multi-aperture approach based on parallel image transfer in order to overcome these constraints. It exploits state of the art microoptical manufacturing techniques on wafer level in order to create a compact, cost-effective system with a large field of view. However, initial prototypes have so far been subject to various limitations regarding their manufacturing, reliability and applicability. In this work, we demonstrate the optical design and fabrication of an advanced system, which overcomes these restrictions. In particular, a revised optical design facilitates a more efficient and economical fabrication process and inherently improves system reliability. An additional customized front side illumination module provides homogeneous white light illumination over the entire field of view while maintaining a high degree of compactness. Moreover, the complete imaging assembly is mounted on a positioning system. In combination with an extended working range, this allows for adjustment of the system's focus location. The final optical design is capable of capturing an object field of 36x24 mm(2) with a resolution of 150 cycles/mm. Finally, we present experimental results of the respective prototype that demonstrate its enhanced capabilities.

关键词： Multi-aperture imaging microoptics multi-channel optical design image sensors

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design and fabrication of hybrid dichroic mirrors for light separation/recombination by using flat plate

Design and fabrication of hybrid dichroic mirrors for light ...

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conference on current developments in optical design and engineering viI

作者： Park, JH Hwang, YM Kim, YH Kim, EH Jeong, SY Samsung Adv Inst Technol Display Mat Lab Mat & Devices Sector Suwon 440600 South Korea

ISBN: (纸本)0819428841

We report the design and fabrication of Hybrid Dichroic Mirrors (HDM) for the separation and the recombination of white laser beam by using small sized flat plate far a small Laser Projection Display (LPD) system. This small sized laser projection display system is consist of a white laser, hybrid dichroic mirrors, 3-channel AOM and a beam scanning part. Red, green and blue light beams are separated by one flat plate dichroic mirror and also modulated by the 3-channel AOM, are recombined to one beam by another flat plate dichroic mirror. These hybrid dichroic mirrors are designed to measure the separation and recombination of s-polarized light beams of 647, 515, 488nm wavelength from the white laser. Key element of the mirror design includes the quarter wavelength multilayers optimized to provide the best performance for the separation and recombination of light beams. The calculated values of the transmittance, which are pass through the hybrid dichroic mirror, are 95% for each separated/recombined color beams. The measured values of transmittance are over 90%.

关键词： Hybrid Dichroic Mirrors Laser Projection Display 3-channel AOM separation and recombination

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current developments IN optical engineering AND DIFFRACTION PHENOMENA.

CURRENT DEVELOPMENTS IN OPTICAL ENGINEERING AND DIFFRACTION ...

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current developments in optical engineering and Diffraction Phenomena.

This conference proceedings contains 26 papers covering the following major subjects: optical design, optical engineering and manufacturing optical systems and their applications and diffraction phenomena.

ISBN: (纸本)0892527145

关键词： optical SYSTEMS

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