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

共 530 条记录，以下是111-120 订阅

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Introducing the quantum efficiency of fluorescence of SCHOTT optical glasses 18

Introducing the quantum efficiency of fluorescence of SCHOTT...

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conference on current developments in lens design and optical engineering XVIII

作者： Jedamzik, Ralf Elsmann, Frank Engel, Axel Petzold, Uwe Pleitz, Jana Schott AG D-55122 Mainz Germany

ISBN: (纸本)9781510612082;9781510612075

The fluorescence of optical glasses is a property that needs to be taken into account in optical designs for life science applications. Many optical glasses from SCHOTT show a very low intrinsic or auto-fluorescence. The fluorescence depends mainly on the applied excitation wavelength and the optical glass type. The fluorescence of optical glasses is usually defined as the quotient of the integral of the emission spectrum with the integral of the emission spectrum of a reference glass. This definition does not give any information about the actual quantum efficiency of the fluorescence. In this presentation recent data on the integral fluorescence of SCHOTT optical glasses are presented. Additionally, first measurements of the quantum efficiency of SCHOTT optical glasses are presented and compared to the standard method.

关键词： Glasses Luminescence Quantum efficiency Biomedical optics Life sciences Space telescopes Visual optics Lithography Microscopy optical design

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Smart lighting using a liquid crystal modulator 18

Smart lighting using a liquid crystal modulator

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conference on current developments in lens design and optical engineering XVIII

作者： Baril, Alexandre Thibault, Simon Galstian, Tigran Univ Laval Dept Phys Genie Phys & Opt Ctr Opt Photon & Laser 2375 Rue Terrasse Quebec City PQ G1V 0A6 Canada

ISBN: (纸本)9781510612082;9781510612075

Now that LEDs have massively invaded the illumination market, a clear trend has emerged for more efficient and targeted lighting. The project described here is at the leading edge of the trend and aims at developing an evaluation board to test smart lighting applications. This is made possible thanks to a new liquid crystal light modulator recently developed for broadening LED light beams. The modulator is controlled by electrical signals and is characterized by a linear working zone. This feature allows the implementation of a closed loop control with a sensor feedback. This project shows that the use of computer vision is a promising opportunity for cheap closed loop control. The developed evaluation board integrates the liquid crystal modulator, a webcam, a LED light source and all the required electronics to implement a closed loop control with a computer vision algorithm.

关键词： optical systems Illumination closed loop vision system spatial light modulator

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optical spherometer for measuring large curvature radii of convex surfaces 18

Optical spherometer for measuring large curvature radii of c...

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conference on current developments in lens design and optical engineering XVIII

作者： Alvarado Martinez, Jorge de Jesus Vazquez y Montiel, Sergio Camacho Bello, Cesar Joel Univ Politecn Tulancingo Tulancingo Hgo Mexico Univ Interserrana Estado Puebla Puebla Mexico

ISBN: (纸本)9781510612082;9781510612075

Measuring large curvature radii of convex surfaces with high precision is a challenge because the spherometer's focus must be positioned at the apex of the surface and at the center of curvature of the surface by moving the surface or the spherometer. If the radius of curvature is larger than the back focus of spherometer, then measurement is not possible. In this work, we propose to use the FOCOIVA system1 to move the focus of the spherometer in longitudinal way without modifying the f number by moving two lenses inside it, with this mechanism it is possible to measure radii of curvature of several meters in length. The curves of movement of the lenses and the optical parameters of the lenses that compose the spherometer are presented.

关键词： optical design spherometer radii of curvature convex surfaces

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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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New tools for the design of freeform mirrors 18

New tools for the design of freeform mirrors

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conference on current developments in lens design and optical engineering XVIII

作者： Dilworth, Donald C. Opt Syst Design Inc POB 247 East Boothbay ME 04544 USA

ISBN: (纸本)9781510612082;9781510612075

Advances in manufacturing and measuring technology are making the use of freeform mirrors more practical than in the recent past. New degrees of freedom make it possible for designers to improve image quality while increasing the field of view and avoiding obscurations. But other issues arise when one designs a system with several mirrors, particularly packaging and clearance concerns: one must ensure that none of the mirrors gets in the way of the beam from any of the others, and one must consider the coordinate system in which the shapes are defined and in which they are measured, which are not necessarily the same. Addressing these concerns requires new computational tools.

关键词： Freeform aspheric mirrors beam clearance at mirrors

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optical design of an athermalised dual field of view step zoom optical system in MWIR 18

Optical design of an athermalised dual field of view step zo...

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conference on current developments in lens design and optical engineering XVIII

作者： Kucukcelebi, Doruk Roketsan Kemalpasa Mahallesi Sehit Yuzbasi Adem Kutlu Soka TR-06780 Ankara Turkey

ISBN: (纸本)9781510612082;9781510612075

In this paper, the optical design of an athermalised dual field of view step zoom optical system in MWIR (3.7 mu m-4.8 mu m) is described. The dual field of view infrared optical system is designed based on the principle of passive athermalization method not only to achieve athermal optical system but also to keep the high image quality within the working temperature between -40 degrees C and + 60 degrees C. The infrared optical system used in this study had a 320 pixel x 256 pixel resolution, 20 mu m pixel pitch size cooled MWIR focal plane array detector. In this study, the step zoom mechanism, which has the axial motion due to consisting of a lens group, is considered to simplify mechanical structure. The optical design was based on moving a single lens along the optical axis for changing the optical system's field of view not only to reduce the number of moving parts but also to athermalize for the optical system. The optical design began with an optimization process using paraxial optics when first-order optics parameters are determined. During the optimization process, in order to reduce aberrations, such as coma, astigmatism, spherical and chromatic aberrations, aspherical surfaces were used. As a result, athermalised dual field of view step zoom optical design is proposed and the performance of the design using proposed method was verified by providing the focus shifts, spot diagrams and MTF analyzes' plots.

关键词： Dual field of view step zoom optical design paraxial optics athermalization Mid Wave Infrared (MWIR)

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Zoom system without moving element by using two liquid crystal lenses with spherical electrode 18

Zoom system without moving element by using two liquid cryst...

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conference on current developments in lens design and optical engineering XVIII

作者： Yang, Ren-Kai Lin, Chia-Ping Su, Guo-Dung J. Natl Taiwan Univ Grad Inst Photon & Optoelect 1Roosevelt RdSect 4 Taipei Taiwan

ISBN: (纸本)9781510612082;9781510612075

A traditional zoom system is composed of several elements moving relatively toward other components to achieve zooming. Unlike tradition system, an electrically control zoom system with liquid crystal (LC) lenses is demonstrated in this paper. To achieve zooming, we apply two LC lenses whose optical power is controlled by voltage to replace two moving lenses in traditional zoom system. The mechanism of zoom system is to use two LC lenses to form a simple zoom system. We found that with such spherical electrodes, we could operate LC lens at voltage range from 31V to 53 V for 3X tunability in optical power. For each LC lens, we use concave spherical electrode which provide lower operating voltage and great tunability in optical power, respectively. For such operating voltage and compact size, this zoom system with zoom ratio approximate 3: 1 could be applied to mobile phone, camera and other applications.

关键词： replication process liquid crystal lens zoom system

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Infrared simulation and performance validation of pinhole and 4-bar collimator targets for static performance evaluation of thermal imaging systems 18

Infrared simulation and performance validation of pinhole an...

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conference on current developments in lens design and optical engineering XVIII

作者： Kucukcelebi, Doruk Roketsan Kemalpasa Mahallesi Sehit Yuzbasi Adem Kutlu Soka TR-06780 Ankara Turkey

ISBN: (纸本)9781510612082;9781510612075

The minimum resolvable temperature difference (MRTD) and minimum detectable temperature difference (MDTD) are widely accepted static performance test parameters that best describe the field performance of thermal imaging systems. MRTD test is measured by determining the minimum temperature difference between the 4-bar target and the background required to resolve the thermal image of the bars by an observer. On the other hand, MDTD test is measured by determining the minimum temperature difference between the target and the background, which is required to detect the target from the thermal image. Different temperature differences between the target and the background with different target spatial dimensions were used while conducting both MRTD and MDTD measurements using collimator test systems. In this study, to evaluate the field performance of various thermal imaging systems, MRTD and MDTD tests were applied. Then, infrared simulations of pinhole and 4-bar collimator static test system targets were described based on the electro-optical parameters of unit under test (UUT) including detector resolution, system SiTF (Signal Transfer Function), system MTF (Modulation Transfer Function) and total optical transmission. With these inputs, the infrared simulation images of pinhole and 4-bar targets, which have adjustable temperature difference and different spatial frequency, were obtained in MATLAB environment. Then, the infrared simulations of pinhole and 4-bar target images were verified with thermal imaging system.

关键词： Infrared simulation performance validation pinhole target 4-bar target MRTD MDTD

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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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Contact lens design with slope-constrained Q-type aspheres for myopia correction 18

Contact lens design with slope-constrained Q-type aspheres f...

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conference on current developments in lens design and optical engineering XVIII

作者： Peng, Wei-Jei Cheng, Yuan-Chieh Hsu, Wei-Yao Yu, Zong-Ru Ho, Cheng-Fang Abou-El-Hossein, Khaled Natl Appl Res Labs Instrument Technol Res Ctr Taiwan 20R&D Rd 6Hsinchu Sci Pk Hsinchu 300 Taiwan Nelson Mandela Metropolitan Univ Precis Engn Lab ZA-6031 Port Elizabeth South Africa

ISBN: (纸本)9781510612082;9781510612075

The design of the rigid contact lens (CL) with slope-constrained Q-type aspheres for myopia correction is presented in this paper. The spherical CL is the most common type for myopia correction, however the spherical aberration (SA) caused from the pupil dilation in dark leads to the degradation of visual acuity which cannot be corrected by spherical surface. The spherical and aspheric CLs are designed respectively based on Liou's schematic eye model, and the criterion is the modulation transfer function (MTF) at the frequency of 100 line pair per mm, which corresponds to the normal vision of one arc-minute. After optimization, the MTF of the aspheric design is superior to that of the spherical design, because the aspheric surface corrects the SA for improving the visual acuity in dark. For avoiding the scratch caused from the contact profilometer, the aspheric surface is designed to match the measurability of the interferometer. The Q-type aspheric surface is employed to constrain the root-mean-square (rms) slope of the departure from a best-fit sphere directly, because the fringe density is limited by the interferometer. The maximum sag departure from a best-fit sphere is also controlled according to the measurability of the aspheric stitching interferometer (ASI). The inflection point is removed during optimization for measurability and appearance. In this study, the aspheric CL is successfully designed with Q-type aspheres for the measurability of the interferometer. It not only corrects the myopia but also eliminates the SA for improving the visual acuity in dark based on the schematic eye model.

关键词： aspheric contact lens Q-type aspheres myopia spherical aberration schematic eye model visual acuity best-fit sphere

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