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Caustic surface produced by a plane wavefront refracted through positive bi-conic lenses. 17

Caustic surface produced by a plane wavefront refracted thro...

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conference on current developments in Lens design and optical engineering XviI

作者： Ponce-Hernandez, Osvaldo Avendano-Alejo, Maximino Roman-Hernandez, Edwin Moreno-Oliva, Ivan Univ Nacl Autonoma Mexico Ctr Ciencias Aplicadas & Desarrollo Tecnol Apdo Postal 70-186 Mexico City 04510 DF Mexico Univ Istmo Div Estudios Posgrado Campus Tehuantepec Cd Univ S-N Santo Domingo Tehuantepe 70760 Oaxaca Mexico

ISBN: (数字)9781510602861

ISBN: (纸本)9781510602854;9781510602861

We study the formation of caustic surfaces produced by bi-conic lenses, considering a plane wavefront propagating parallel to the optical axis. 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 the lens in such a way that if we are able to vanish the caustic, the optical system produces an image without spherical aberration, alternatively caustic surfaces having a large area could be applied to design non-imaging optical systems, such as diffusers of light. 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 the bi-conic lens. We provide an analytic equation for the caustic surface in a meridional plane and some examples are presented.

关键词： Ray tracing Lenses Protactinium Refraction Wavefronts Geometrical optics Interfaces Monochromatic aberrations optical design Cadmium

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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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STABILITY OF THE optical-PROPERTIES OF ABNORMALLY DISPERSIVE LIQUIDS 4

STABILITY OF THE OPTICAL-PROPERTIES OF ABNORMALLY DISPERSIVE...

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conference on current developments in optical design and optical engineering IV

作者： PETROVA, MV PLYUKHIN, AG TOLSTOY, MN ROBB, P SIGLER, RD LEARY, DF VAVILOV STATE OPT INST ST PETERSBURGRUSSIA

ISBN: (纸本)0819415871

Abnormal dispersion is found in a large number of optical liquids. These liquids are quite useful in the design of apochromatic lens systems because they are inexpensive and are readily available compared to the expensive abnormal dispersion glasses and crystals more commonly used. Further, there is no practical upper limit on the size of a liquid optical element. However, because the use of these materials as optical elements is quite new, the long term stability of their optical properties after exposure to various environmental conditions must be determined. In this paper, we report on a series of tests performed to determine the optical stability of several abnormal dispersion liquids. The liquids were subjected to: (1) high intensity ultraviolet radiation, (2) high temperatures, and (3) long term exposure to air. Measurements of both optical transmission and refractive index were performed before and after each exposure. The tests were performed on four abnormal dispersion liquids that have been found to be quite useful in the design of apochromatic lenses. The results indicate that long term exposure to either intense ultraviolet radiation or air, produced only negligible changes in the index of refraction. Changes in optical transmission were observed, but they were largely confined to the ultraviolet spectral region. Prolonged exposure to temperatures of 60 degree(s)C did not produce any measurable change in the optical properties. The measurements were performed at the Vavilov State optical Institute, St. Petersburg, Russia, in collaboration with Lockheed Palo Alto Research Laboratory, Palo Alto, California.

关键词： Liquids Ultraviolet radiation Absorption Glasses Lens design optical properties Refractive index visible radiation Lamps optical components

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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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optical design of the focal adjustable flashlight based on a power white-LED

Optical design of the focal adjustable flashlight based on a...

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conference on current developments in Lens design and optical engineering XII/Advances in Thin Film Coatings viI

作者： Cai, Jhih-You Lo, Yi-Chien Sun, Ching-Cherng Natl Cent Univ Dept Opt & Photon Inst Lighting & Display Sci Taipei Taiwan

ISBN: (纸本)9780819487384

In the paper, we design a focal adjustable flashlight, which can provide the spotlight and the wide-angle illumination in different modes. For most users, they two request two illumination modes. In such two modes, one is high density energy of the light pattern and the other is the uniform light pattern in a wide view field. In designing the focal adjustable flashlight, we first build a precise optical model for the high-power LED produced by CREE Inc. in mid-field verification to make sure the accuracy of our simulation. Typically, the lens is useful to be the key component of the adjustable flashlight, but the optical efficiency is low. Here, we introduce a concept of so-called total internal refraction (TIR) lens into the design of flashlight. By defocusing the TIR lens, the flashlight can quickly change the beam size and energy density to various applications. We design two segments of the side of the TIR lens so that they can be applied to the two modes, and the flashlight provides a high optical efficiency for each mode. The illuminance of the center of light pattern at a distance of 2 m from the lamp is also higher than using the lens in the spotlight and wide-angle illumination. It provides good lighting functions for users.

关键词： Spotlight Wide-angle illumination LED TIR lens

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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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design verifications of a linear laser encoder with high head-to-scale tolerance

Design verifications of a linear laser encoder with high hea...

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

作者： Wu, CC Chen, YC Lee, CK Hsieh, CT Wu, WJ Lu, SS Natl Taiwan Univ Inst Engn Mech Taipei 10764 Taiwan

ISBN: (纸本)0819432652

Laser encoders overcome the fundamental resolution limit of geometrical optical encoders by cleverly converting the diffraction limit to phase coded information so as to facilitate nanometer displacement measurement. As positioning information was coded within the optical wavefront of laser encoders, interferometry principle thus must be adopted within the design of the laser encoders. This effect has posed a very strong alignment tolerance among various components of the whole laser encoder, which in turn impose a serious user adaptation bottleneck. Out of all alignment tolerance, the head-to-scale alignment tolerance represents the most important hindrance for wider applications. Improving the IBM laser optical encoder design by taking into the consideration of manufacturing tolerance of various optical components, an innovative linear laser encoder with very high head-to-scale tolerance is presented in this article. Efficiency of the TE/TM incident Light beams on the grating scale used are examined theoretically and verified experimentally so as to provide design optimizations of the grating scale. Effect of various grating scales, quartz master or polymer-based grating replicate, is also detailed. Signal processing used to decode the quadrature based positioning optical signal is also studied. Experimental results that verify the resolutions of the tabletop laser encoder prototype by comparing the decoded quadrature signal and a HP laser interferometer output signal is also presented.

关键词： laser encoder alignment tolerance alignment tooling diffractive grating diffractive encoder

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design of a radiance meter with predicted size of source and distance effects 17

Design of a radiance meter with predicted size of source and...

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conference on current developments in Lens design and optical engineering XviI

作者： Suarez-Romero, J. G. Solorio-Leyva, J. C. Hurtado-Ramos, J. B. Tecnolo Nacl Mexico lnst Tecnolo Queretaro Tecnolo SN Esq Escobedo Queretaro 76000 Qro Mexico Tecnol Nacl Mexico Inst Tecnol Piedad Tecnol 2000 La Piedad 59370 Michoacan Mexico Inst Politecnico Nacl Centro Invest Ciencia Aplicada Tecnol Cerro Blanco 141 Queretaro 76090 Qro Mexico

ISBN: (数字)9781510602861

ISBN: (纸本)9781510602854;9781510602861

In a previous work, we described the theoretical fundamentals for the design of radiance meters. There, we observed that the length between the first and the second aperture of the instrument plays an important role in the performance of the meter. Such a length is a parameter related with the instrument response to variations of the size of the source and of the distance between the instrument and the source. Such dependences are not predicted by the theory of geometrical optics, normally used in the instrument design. Even the approximation of wave optics gives a partial understanding of the propagation of optical radiation. A more general treatment, based in the theory of partial coherence, gives a better description of the propagation.

关键词： Radiometry Radiance meter Partial Coherence Diffraction Lambertian Source Distance Effect Size of Source Effect Diffraction Corrections

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design of two-dimensional (crossed) grating calculation in Czerny-Turner spectrometer with usage of freeform mirrors 18

Design of two-dimensional (crossed) grating calculation in C...

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conference on current developments in Lens design and optical engineering XviII

作者： Bazhanov, Yury Demura, Elena Cherkashina, Rasima Vlahco, Vadim. Corp Precis Syst & Instruments 53 Aviamotornaya Str Moscow 111024 Russia Dynaoptics 8 Boon Lay Way Singapore 609964 Singapore

ISBN: (纸本)9781510612082;9781510612075

The possibility of building a spectrometer based on a flat two-dimensional (crossed) grating is being considered. The most suitable layout for this is the Czerny-Turner, where a spectral image lies in the plane. In this paper an attempt to compensate for the transverse aberrations is made by using a diffraction grating with variable spacing grooves in both sections and aspheric mirror elements of layout, including ones having a freeform surface. Using crossed grating greatly simplifies the device layout and may be particularly effective when used in the ultraviolet and infrared regions of the spectrum, due to a small choice of transmissive materials for manufacturing spectral prisms. This paper gives examples of such case.

关键词： cross-dispersion two-dimensional (crossed) gratings Czerny-Turner spectrometers freeform mirrors

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optical coatings for the optical concentrator with the prism film 19

Optical coatings for the optical concentrator with the prism...

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

作者： Jaing, Cheng-Chung Wan, Wei-Li Yang, Pao-Keng Ying, Shang-Ping Chen, Bing-Mau Minghsin Univ Sci & Technol Dept Optoelect Syst Engn 1 Xinxing Rd Hsinchu 30401 Taiwan

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

Effects of a coating combination, a prism film and a phosphor layer on the short current of the solar cell in the optical solar concentrator and the illuminance of the sunlight passing through the samples were investigated. The optical solar concentrator was a 50 mm x 50 mm x 5 mm B270 thick glass with its sides connected by a solar cell. The prismatic structure of the prism film had a period of 50 mu m. A phosphor Y560 having an absorption band of 390 nm to 500 nm and emitting from 490 nm to 700 nm was prepared. Six coating combinations applied in this study were composed of optical filters and glass. The optical filters included infrared cut-off, magenta, red, green and blue filters. The deflection angle was between 31 and 33 degrees when the incident sunlight passed through the prism film. The short current of the solar cell in the optical solar concentrator with the prism film, the coating combination and the phosphor layer was largest in this study. Experimental results show that the coating is more suitable for enhancing the short current than the phosphor layer in the optical solar concentrator with the prism film. And the phosphor layer can increase the illuminance of the sunlight passing through the samples due to the human eye sensitivity.

关键词： optical concentrator coating prism film phosphor layer short current illuminance optical filter solar cell

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