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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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Plane development of lateral surfaces for inspection systems

Plane development of lateral surfaces for inspection systems

引用

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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optical design for the Adaptive Secondary Setup and Instrument Stimulator (ASSIST)

Optical design for the Adaptive Secondary Setup and Instrume...

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conference on current developments in Lens design and optical engineering viI

作者： Hallibert, Pascal Arsenault, Robin Delabre, Bernard Esposito, Simone Hubin, Norbert Quirrenbach, Andreas Riccardi, Armando Stroebele, Stefan Stuik, Remko vink, Ramon Leiden Observ POB 9513 NL-2300 RA Leiden Netherlands ESO DE-85748 Garching Germany Osserv Astrofis Arcetri I-50125 Florence Italy

ISBN: (纸本)0819463671

A comprehensive suite of Adaptive Optics systems and AO-assisted instruments is currently under development for the VLT and will be built around a hyperbolic convex adaptive Deformable Secondary Mirror (DSM). In telescopes with such a secondary mirror, test and calibration of both the DSM and the science instruments using it are notoriously expensive and time-consuming. The Adaptive Secondary Setup and Instrument Stimulator (ASSIST) is being developed to allow test and integration of three key elements of the future viLT Adaptive Telescope Facility: the DSM and 2 instrument-specific adaptive optics systems (GALACSI for MUSE and GRAAL for HAWK-I). The core of ASSIST is a standalone interferometric test setup for the DSM allowing its test at its center of curvature (significantly reducing the size of the classical hyperbole focii test configuration). This setup is completed by a star simulator for both natural and laser guide stars, a turbulence generator (for realistic AO performance measurements), a corrector system generating a VLT-like exit pupil and a Nasmyth rotator simulator interfacing with the two AO systems. In this paper we present the optical architecture of ASSIST, detailing the current design of the different parts of the system, and discuss its projected performance and compliance with the test and calibration requirements.

关键词： Adaptive Optics Deformable Secondary Mirror ASSIST Test Bench Pupil Imaging Turbulence Generator VLT Adaptive Optics Facility GALACSI GRAAL MUSE HAWK-I

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An optimized design of a scanning confocal probe

An optimized design of a scanning confocal probe

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conference on current developments in Lens design and optical engineering viI

作者： Qiu, Z. R. Qin, J. Zhang, H. W. Zhang, G. X. Lu, Stephen C. Tianjin Univ State Key Lab Precis Measuring Technol & Instrume Tianjin 300072 Peoples R China Univ Southern Calif Dept Aerosp & Mech Engn Los Angeles CA 90089 USA

ISBN: (纸本)0819463671

Basing on the principle of dynamic active confocal measuring method, a non-contact probe was introduced. The relation between the displacement of the object measured and the displacement of the oscillating unit was established by applying to the measure principle. To find the effect way to improve the output signal, a mathematical modal of the photoelectric signal was proposed. According to the mathematical modal, the diameter of the pinhole was decided and the optical path was adjusted, which improved the performance of the probe. It valuable to emphasize that the double lens oscillating unit was the crucial parts of the mechanical and optical structure. The tuning fork stimulating, inductive coils and the pinhole and photodiode adjuster device were designed according to the theoretical analysis, which were more convenient to the measure task. The stability of the oscillating unit was tested;and the optical and mechanical performance of the probe was validated by experiments using gage blocks combining with a micro-motion measuring mount model. The cost of a micro-displacement testing sensor was saved in designing of this kind of probe. A more accurate signal processing method was discussed in this paper.

关键词： dynamic active confocal mathematical modal structure stability

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Low profile optic design for mobile camera using dual freeform reflective lenses

Low profile optic design for mobile camera using dual freefo...

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conference on current developments in Lens design and optical engineering viI

作者： Jeong, Ho-Seop Yoo, Ho-Sik Lee, Sang-Hyuk Oh, Hae-Ran Samsung Elect Mech Cent R&D Inst Opt Lab Suwon 443743 South Korea

ISBN: (纸本)0819463671

Aspherical glass or plastic lenses are usually adapted in the camera module of handheld phone. Recently, slimmer cameras are required according to reducing thickness of handheld phone. In this paper, we present an ultra slim camera module using multiple freeform off-axis imaging lenses. New optical concept of multiple lens system introduces the planar optics with freeform. shaped aspherical lens surface on the wafer, which can achieve the thickness of 50% compared to the conventional symmetric lens system. In order to achieve the resolution specification, we separate the field of view in camera module. As the result, two inverted images are produced on a same imaging sensor and the acquired inverted images are processed by photo stitching algorithm so as to combine them. Finally, in order to verify the new imaging system, we manufacture the new slim lens through the LJV embossing replication process. We found the new imaging system is feasible for VGA resolution and it can be expandable to the high resolution system.

关键词： freeform. surface planar integrated optics photo stitching wafer scale lens UV embossing

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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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design of a thermal imaging diagnostic using 90-degree, off-axis parabolic mirrors

Design of a thermal imaging diagnostic using 90-degree, off-...

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conference on current developments in Lens design and optical engineering viI

作者： Malone, Robert M. Becker, Steven A. Dolan, Daniel H. Hacking, Richard G. Hickman, Randy J. Kaufman, Morris I. Stevens, Gerald D. Turley, William D. NSTec Los Alamos Operat 182 East Gate Dr Los Alamos NM 87544 USA NSTec North Las Vegas Operat Las Vegas NV 89193 USA Sandia Natl Labs Albuquerque NM 87185 USA NSTec Special Technol Lab Santa Barbara CA 93111 USA

ISBN: (纸本)0819463671

Thermal imaging is an important, though challenging, diagnostic for shockwave experiments. Shock-compressed materials undergo transient temperature changes that cannot be recorded with standard (greater than ins response time) infrared detectors. A farther complication arises when optical elements near the experiment are destroyed. We have designed a thermal-imaging system for studying shock temperatures produced inside a gas gun at Sandia National Laboratories. Inexpensive, diamond-turned, parabolic mirrors relay an image of the shocked target to the exterior of the gas gun chamber through a sapphire vacuum port. The 3000-5000-nm portion of this image is directed to an infrared camera which acquires a snapshot of the target with a minimum exposure time of 150 us. A special mask is inserted at the last intermediate image plane, to provide dynamic thermal background recording during the event. Other wavelength bands of this image are split into high-speed detectors operating at 900-1700 nm and at 1700-3000 nm, for time-resolved pyrometry measurements. This system incorporates 90-degree, off-axis parabolic mirrors, which can collect low f/# light over a broad spectral range, for high-speed imaging. Matched mirror pairs must be used so that aberrations cancel. To eliminate image plane tilt, proper tip-to-tip orientation of the parabolic mirrors is required. If one parabolic mirror is rotated 180 degrees about the optical axis connecting the pair of parabolic mirrors, the resulting image is tilted by 60 degrees. Different focal-length mirrors cannot be used to magnify the image without substantially sacrificing image quality. This paper analyzes performance and aberrations of this imaging diagnostic.

关键词： mid-IR imaging off-axis parabolic mirrors gas gun imaging IR camera pyrometry

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Proceedings of SPIE: current developments in Lens design and optical engineering vi

Proceedings of SPIE: Current Developments in Lens Design and...

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current developments in Lens design and optical engineering vi

The proceedings contain 27 papers. The topics discussed include: using multi-function components to solve optical design challenges for DUV microlithographic applications;automated synthesis of both the topology and numerical parameters for seven patented optical lens systems using genetic programming;advances in lenticular lens arrays for visual display;wide field-of-view imaging system using a liquid crystal spatial light modulator;design tools for freeform optics;designing and specifying aspheres for manufacturability;infrared hybrid optics with high broadband efficiency;removing challenges in microlithographic optical design;laser beam filtering by refractive or diffractive microstructures;and a hybrid athermal CCD camera.

关键词： optical design

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Roles of Bioelectronics for Quality of Life

Roles of Bioelectronics for Quality of Life

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European conference on Solid-State Circuits (ESSCIRC)

作者： H. Schmidt A. Shakouri M. Isaacson S. M. Kang Baskin School of Engineering University of California Santa Cruz Santa Cruz CA USA

Bioelectronics is an important technology in enhancing the quality of life, especially for those who are suffering from physiological difficulties. Novel biomimetic microelectronic systems will enable treatment of some of presently incurable human handicaps such as hearing loss, blindness (retinal prosthesis), paralysis (neuron-muscular prosthesis), and memory loss (cortical prosthesis). With advancement of bionanotechnology and quantitative medical research, the potential application of biomimetic systems is highly promising. In this paper we review the current status of biomimetic microelectronic systems and challenging issues in basic interface between electrodes and neuronal network, laboratory on a chip (LoC), and generation of power for implantable devices. For laboratory-on-a-chip (LoC), we examine a new way of detecting and sensing molecules on a chip with single molecule/particle sensitivity by fusing integrated optics with microfluidics, based on integrated hollow-core antiresonant reflecting optical waveguides (ARROW) waveguides. With multilayer dielectric confinement, the light is guided through hollow channels with cross sections of a few microns squared. We have demonstrated efficient light guiding in liquid-core ARROWs, single-molecule fluorescence sensitivity in fully planar beam geometry, surface-enhanced Raman scattering, fluorescence from live ribosomes in buffer solution, and electrical fluorescence control by applying a voltage between fluidic reservoirs connected to the waveguide channels. For electrical power sourcing of implantable biomimetic devices and systems, we illustrate the potential of the diffusion potential differences established between two half-cells of electrolyte solutions of different concentrations to generate directly an electric current. This concentration cell operates solely on a salt concentration gradient. The future advancement of biomimetic systems design will critically depend on computer aids as in VLSI developments

关键词： Biomimetics Prosthetics optical waveguides Fluorescence Laboratories Lab-on-a-chip Power generation Integrated optics optical buffering optical waveguide components

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optical design of the Terrestrial Planet Finder Coronagraph starlight suppression system

Optical design of the Terrestrial Planet Finder Coronagraph ...

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current developments in Lens design and optical engineering vi

作者： Mouroulis, Pantazis Shaklan, Stuart B. Jet Propulsion Laboratory California Institute of Technology Pasadena CA 91109

A baseline design for NASA's Terrestrial Planet Finder Coronagraph (TPFC) starlight suppression system (SSS) is described. The design is based on a 8×3.5m elliptical aperture telescope leading to terrestrial planet detection at a minimum angle of ∼4λ/D. The design accommodates classical Lyot coronagraph as well as shaped pupil approaches and includes separate optical paths for two polarizations each with its own deformable mirror control. Critical design challenges and trades are described.

关键词： optical design

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