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

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Research on chromatic properties of high order kinoform 15

Research on chromatic properties of high order kinoform

引用

conference on current developments in Lens design and optical engineering XV

作者： Wegrzynska, K. Rachon, M. Doch, M. Siemion, A. Suszek, J. Kolodziejczyk, A. Sypek, M. Warsaw Univ Technol Fac Phys PL-00662 Warsaw Poland

ISBN: (纸本)9781628412192

This work is dedicated to the evaluation of the chromatic properties of high order kinoforms. Typical kinoform (of the first order) is a phase only structure having the phase retardation varying in the range 0-2 pi. Such structures are very commonly used in many practical applications for different ranges of electromagnetic radiation like ultraviolet, visible, infrared, terahertz and millimeter waves. Besides those benefits such structures have one crucial disadvantage - they suffer from big chromatic aberration. This limits their practical application only to the narrowband work, where main wavelength must be well defined (Delta lambda/lambda<<1). This paper presents other type of diffractive structures called high order kinoforms (HOK). They exhibit phase retardation of n2 pi, where n is an integer number much bigger than 1. Due to this fact they are relatively thin and therefore can be manufactured using laser lithography in thick photoresist (deeply etched). On the other hand they are thick enough to suppress chromatic aberrations. In comparison to the well-known Fresnel lens, the high order kinoform structure has precisely controlled phase retardation between different zones. In the case of the Fresnel lens (known from XVIII/XIX century), phase retardations between different zones are random (designing process is based on the geometrical optics). In the case of the high order kinoform working as the spherical lens - taking into account the real size of the detector - it can be shown that the most of the energy being focused in the focal spot will be registered by the detector for different wavelengths. The paper presents simple theoretical considerations, numerical modeling and their experimental evaluation.

关键词： diffractive optics kinoform higher order kinoform chromatic aberration optical elements

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MULTICHANNEL IMPULSE SOURCE USING NONLINEAR TRANSMISSION LINES

MULTICHANNEL IMPULSE SOURCE USING NONLINEAR TRANSMISSION LIN...

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4th SPIE conference on optically Activated Switches

作者： SEDDON, N BRITISH AEROSP OPERAT LTD SOWERBY RES CTRBRISTOLENGLAND

ISBN: (纸本)0819416762

This paper describes the design and operation of a multichannel, high voltage pulse generator. The pulse generator produces six pulses with rise times of 1- 2 ns and peak voltages over 20kV. Each of the output pulses is separately controlled to provide a variable pulse delay of up to 15ns. Jitter between pulses is <50 ps. The circuit is based on a primary pulse generator and six ferrite loaded transmission lines which simultaneously reduce the rise time of the primary pulse and delay application of the six output pulses to their loads. The pulses in each of the ferrite transmission lines are independently controlled by simple DC current sources.

关键词： Pulse generators Switching Magnetism Wave propagation Capacitors Connectors Information technology Radon Aerospace engineering Imaging systems

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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...

引用

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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design of miniaturized optoelectronic systems using resonant micro scanning mirrors for projection of full-color images

Design of miniaturized optoelectronic systems using resonant...

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conference on current developments in Lens design and optical engineering VII

作者： Scholles, M. Braeuer, A. Frommhagen, K. Gerwig, Ch. Hoefer, B. Lakner, H. Schenk, H. Schwarzenberg, M. Fraunhofer Inst Photon Microsyst Maria Reiche Str 2 D-01109 Dresden Germany Fraunhofer Inst Appl Opt & Precis Engn D-07745 Jena Germany

ISBN: (纸本)0819463671

Projection systems comprising micromechanical. scanning mirrors are a promising approach for information display of any kind. If combined with advanced laser diodes as light sources, ultra-compact projection heads can be realized, as it will be shown in this contribution. Besides the laser, key component of the system is a special MEMS device, a two-dimensional resonant micro scanning mirror. The laser beam formed by collimator optics is directed onto the micro scanning mirror. Then, the reflected beam describes a highly complicated Lissajous figure on the projection screen with flare angles of up to 20 degrees. By driving the mirror and electrically modulating the intensity of the laser beam in a synchronous manner, projection of images can be achieved. Advanced techniques that guarantee improved image quality and allow compensation of artifacts because of relative movement between projection head, screen, and human observer will be described. Based on these principles, several optoelectronic systems have been designed. A monochrome projection head that incorporates the laser diode, optics and the micro mirror could be reduced to a volume of 15mm x 7 mm x 5mm. A slightly larger head is attached to a laser unit with red, green, and blue lasers via glass optical fiber for projection of full color images and video streams. All systems have VGA (640 x 480 pixels) resolution. They operate with 8 bit color depth per pixel and 50 frames per second. These key features in combination with the miniaturized size allow their use for a broad range of applications.

关键词： image projection scanning mirror MEMS resonant scanning micro optics

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Recent developments in Optimizing optical Tools for Air Bubble Detection in Medical Devices Used in Fluid Transport

引用

13th International conference on Biomedical engineering (ICBME)

作者： Ravichandran, S. Shanthini, R. Naadhirah, R. R. Nur Yikai, W. Deviga, J. Prema, M. Clinton, L. Temasek Polytech Temasek Engn Sch Singapore 529757 Singapore

ISBN: (纸本)9783540928409

Modelling techniques for optimizing bubble detection tools in the infrared band used in conjunction with a drug transport mechanism for the transport of intravenous fluids in clinical practice have been evaluated qualitatively using simulation techniques. Sensors which are used in signal processing often have limitation when they are made to work in noisy environment. Noise in the working environment can be from various sources such as from power line, high frequency RF fields and background luminance. In case of certain optical sensors, coupling schemes and the interference from devices which are in close proximity to the sensors can also contribute to significant noise. Qualitative studies on the effect of background luminance noise have provided a good understanding on the degree of susceptibility of the optoelectronic receiver for various luminance noises resulting in interferences in the output of a tool developed for the detection of air bubbles in fluid pathways called the "optical Bubble Detection Tool". Experience gained from the earlier studies has provided the required knowledge for developing a design which is less susceptible to external disturbances. The dynamic excitation method for the "optical Bubble Detection Tool" was introduced by modifying the electronic interface of the earlier "optical Bubble Detection Tool". This was easily achieved by understanding the requirements of the pulsed current for energizing the transmitter of the "optical Bubble Detection Tool". As the frequency of excitation and the intensity of the emitted infrared are factors which decide the resolution and sensitivity of the "optical Bubble Detection Tool", it was optimized for several operating environments which are under the influence of other external radiations in the visible range and non-visible range.

关键词： Bubble detection tool Background luminance noise optical sensors

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Proceedings of SPIE - The International Society for optical engineering

Proceedings of SPIE - The International Society for Optical ...

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conference on current developments in Lens design and optical engineering XVI

ISBN: (纸本)9781628417449

The proceedings contain 24 papers. The topics discussed include: integration design of endoscope with different viewing angles;ultra-compact hourglass lens for integrated cameras;testing and alignment of freeform based multi-mirror telescopes;tolerancing an optical freeform surface: an optical fabricator's perspective;manufacture and analysis of a refractive surface with variable asphericity to model the human cornea;modeling and design of a multichannel chromatic aberration compensated imaging system;temperature-dependent refractive index measurements of L-BBH2 glass for the Subaru CHARIS integral field spectrograph;cryogenic refractive indices of S-LAH55, S-LAH55V, S-LAH59, S-LAM3, S-NBM51, S-NPH2, S-PHM52, and S-TIH14 glasses;temperature-dependent refractive index measurements of CaF2, Suprasil 3001, and S-FTM16 for the Euclid near-infrared spectrometer and photometer;design considerations for an unconventional infrared prism with a 90 degree ray deviation;and high-performance LED luminaire for sports hall.

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design ASPECTS FOR A SMART THERMAL INKJET PRINTHEAD

DESIGN ASPECTS FOR A SMART THERMAL INKJET PRINTHEAD

引用

conference on Color Hard Copy and Graphic Arts iv

作者： ZOLLNER, A TECH UNIV MUNICH LEHRSTUHL FEINGERAETEBAUW-8000 MUNICH 2GERMANY

ISBN: (纸本)0819417602

This paper investigates the capabilities of a micro system design for a silicon-based thermal inkjet printhead. The presented design is based on the experiences with an earlier prototype of a bubble jet printhead containing 50 drop ejectors and a printing resolution of 300 dpi. In order to minimize the number of leads connecting the printhead with the printer, an electronic circuit has been integrated on chip. This provides also a lot of features for testing and monitoring the printhead. Due to the electronic circuit a detailed test procedure can be carried out. The test routine reveals data transmission errors, and short and open circuits of the MOSFET power switches. The presented smart printhead has an integrated sensor monitoring chip temperature and a timer supervising the heating pulses which prevents the heater elements from being damaged. Because of current limitations the heater elements have to be fired in groups. Depending on the number and position of spots that are printed at one time there are more or less visible artefacts. Computer simulations have been carried out to evaluate the effect of different timing sequences on print quality.

关键词： MICROSYSTEM SMART PRINTHEAD TESTABILITY SUPERVISORY FUNCTIONS ARTIFACTS TIMING SEQUENCES

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design of ophthalmic contact lens using Q-type aspheres with reduced error budget for high visual acuity 25

Design of ophthalmic contact lens using Q-type aspheres with...

引用

conference on current developments in Lens design and optical engineering XXV

作者： Peng, Wei-Jei Lee, Tsung-Xian Natl Taiwan Univ Sci & Technol Grad Inst Appl Sci & Technol 43Sec 4Keelung Rd Taipei 106 Taiwan Natl Taiwan Univ Sci & Technol Grad Inst Color & Illuminat Technol 43Sec 4Keelung Rd Taipei 106 Taiwan

ISBN: (纸本)9781510679221;9781510679238

This paper investigates the design of an ophthalmic rigid contact lens (CL) that has a Q-type aspheric surface to reduce the tolerance error budget and produce higher visual acuity. CLs for myopia correction are typically made with spherical surfaces;when such CLs are worn in darkness, the visual acuity degrades severely due to the spherical aberration generated by pupil dilation. To maximize visual acuity, an aspheric CL is essential because it can correct the spherical aberration. In this study, a CL is designed based on a schematic eye model for evaluating the modulation transfer function (MTF) on the retina, and the result shows that the visual acuity produced by an aspheric CL is superior to that produced by a spherical CL. The traditional power-series polynomial is commonly used for aspheric surface design, but the aspheric slope cannot be controlled during optimization. The large slope departure from a best-fit sphere leads to high tolerance sensitivity and an inflection point;however, the CL does not permit such results. To solve this problem, the Q-type polynomial with slope constraint proposed by Forbes is applied to the aspheric CL in this study. The Q-type aspheric polynomial can not only enhance the optimization efficiency due to its orthogonal characteristics, but also reduce error budget for maximal manufacturing yield. The simulation results demonstrated that the spherical aberration is successfully reduced by the Q-type aspheric CL for better visual acuity in darkness.

关键词： Rigid contact lens Q-type asphere power-series asphere myopia correction spherical aberration schematic eye model

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WIN 3.5 meter telescope project

WIN 3.5 meter telescope project

引用

Advanced Technology optical Telescopes iv

作者： Johns, Matt Pilachowski, Caty Natl Optical Astronomy Observatories Tucson United States

ISBN: (纸本)081940280X

NOAO, in conjunction with the University of Wisconsin and Indiana University, is building a new 3.5 meter telescope on Kitt Peak, AZ, called the WIN telescope. This paper presents the basic concepts and current status of the WIN project. Recent developments in telescope, optical, and enclosure design are being incorporated into the WIN telescope and are described here. The WIN telescope is designed with a wide field of view to take advantage of recent advancements in multi-object, fiber-optic spectroscopy. A fiber positioner and spectrograph are under development as part of this effort. The enclosure uses a lightweight and well ventilated dome to minimize seeing. The primary mirror is the second of the 3.5 meter borosilicate honeycomb blanks cast in the Steward Observatory Mirror lab. The mirror is being polished in the NOAO optical Shop as part of the NOAO Future Telescope Technology (FTT) program. A new mirror support system is being developed which supports the primary mirror entirely from the back. The temperature of the mirror will be actively controlled.

关键词： Telescopes

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Contact lens design to third order to compensate the spherical aberration of the eye from Zernike polynomials 20

Contact lens design to third order to compensate the spheric...

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conference on current developments in Lens design and optical engineering XX

作者： Garcia-Lievanos, O. Teran-Bobadilla, Emiliano Hernandez-Flores, Luis A. Sanchez-Gonzalez, Leticia Inst Politecn Nacl Ctr Interdisciplinario Ciencias Salud Unidad Santo Tomas Dept Optometry Av Maestros S-N Mexico City 11340 DF Mexico Univ Autonoma Sinaloa Dept Optometry Culiacan Rosales 80040 Sininaloa Mexico

ISBN: (数字)9781510629028

ISBN: (纸本)9781510629028

To compensate the spherical aberration of the eye using the conic constant of the first surface of a contact lens for different refractive errors. Refractive errors were simulated by modifying only the first curvature of the cornea. For every refractive error was calculating Zernike polynomials using Optics Software for Layout and Optimization (OSLO) EDU edition with and without contact lens. To calculate the conic constant of the contact lens we use the Seidel sums for thin lenses from the longitudinal spherical aberration as it proposes V. Mahajan. The value of Zernike spherical aberration coefficient for the eye with farsightedness (+ 5.00 D) + spherical contact lens was 0.142691 mu m. The conic constant value to compensate the spherical aberration was -0.222995 and the value of Zernike spherical aberration coefficient of the eye + aspherical contact lens was 0.004354 mu m. The value of Zernike spherical aberration coefficient for the eye with myopia (- 5.00 D) + spherical contact lens was 0.144505 mu m. The conic constant value to compensate the spherical aberration was -0.101424 and the value of Zernike spherical aberration coefficient of the eye + aspherical contact lens was 0.072820 mu m. The proposed method allows us to design contact lenses that compensate for the spherical aberration of the eye from the Zernike polynomials. Although the design of contact lenses is to third order, we obtain a smaller spherical aberration than the chromatic aberration on the axis without use optimization routine.

关键词： Contact lens spherical aberration aberration of the eye and Zernike polynomials

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