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

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New developments in Gallium Nitride and the Impact on Power Electronics

New Developments in Gallium Nitride and the Impact on Power ...

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Annual IEEE conference on Power Electronics Specialists (PESC)

作者： M.A. Khan G. Simin S.G. Pytel A. Monti E. Santi J.L. Hudgins Department of Electrical Engineering University of South Carolina Columbia SC USA Department of Electrical Engineering University of Nebraska Lincolnshire NE USA

Wide bandgap III-nitride semiconductor materials possess superior material properties as compared to silicon, GaAs and other III-v compound materials. Recent achievements in gallium nitride (GaN) technology for optoelectronics have resulted in ultra-bright blue light emitting diodes and lasers, ultraviolet emitters, and solar-blind optical detectors. In the electronic area, drastic improvement of microwave device performance has been achieved, yielding record high power densities of 20-30 W/mm. Novel applications of these materials in high-power electronics for switching, energy conversion and control are just emerging. This paper provides an overview of the state-of-the-art III-nitride wide bandgap technologies and it explores power electronic applications while illustrating the enormous potential that GaN based devices have for overcoming the major challenges of power electronics in the 21st century. The paper discusses the unique material and device properties of GaN-based semiconductors that make them promising for high-power, high-temperature applications. These include high electron mobility and saturation velocity, high sheet carrier concentration at heterojunction interfaces, high breakdown voltages, and low thermal impedance (when grown over SiC or bulk AIN substrates). The chemical inertness and radiation hardness of nitrides are other key properties. As applied to power electronics, the Ill-Nitride technology allows for high-power switching with sub-microsecond and nano-second switching times. The paper will present the innovations that further improve the performance of high-power DC-DC converters, switches and other building blocks. These include novel insulated gate HFET design that significantly expands the allowable input voltage amplitude, further increases the device peak currents, and most importantly, tremendously improves the large-signal stability and reliability. Insulated gate switching devices have been shown to operate at up to 300 degC wit

关键词： III-v semiconductor materials Gallium nitride Power electronics Photonic band gap Semiconductor materials optical materials DC-DC power converters Switching converters Switches Insulation

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Test results of various CMOS image sensor pixels

Test results of various CMOS image sensor pixels

引用

Canadian conference on Electrical and Computer engineering (CCECE)

作者： D.C.-Y. Li v.C. Gaudet A. Basu Department of Electrical and Computer Engineering University of Alberta Edmonton AB Canada Department of Computing Science University of Alberta Edmonton AB Canada

Today, CMOS image sensors are increasingly used in consumer products. Digital cameras, Web cameras, optical mouses, and smart sensors are some examples. One of the most used CMOS image sensor architectures is based on the active pixel sensor (APS). In order to understand more design tradeoffs, a prototype chip was designed to evaluate different pixel architectures. This paper describes the prototype chip and the test results. The prototype chip is composed of 8 different pixels and a 3-to-8 row decoder. There are two different APS architectures, 3 transistor or 4 transistor. The 8 different pixels are based on the 2 APS architectures with some variations. These variations are 2 types of reset transistor, N mos or P mos , and 2 types of photodiodes, n + - p sub and n well - p sub . The prototype chip was manufactured in a standard 3.3 v 0.35 mum 1-poly 4-metal CMOS process. The row decoder was designed using a pass transistor network, inverters, and pull-up transistors. The test results show that for white light, n + - p sub photodiodes and n well - p sub photodiodes have approximately the same response. Also, 4 transistor pixels have better response, but the voltage range for linear operation is smaller. 3 transistor pixels have larger voltage range for linear operation and less dark current. The results also confirm that the output of the pixels is inversely proportional to the distance of the light source

关键词： Testing CMOS image sensors Pixel Prototypes Photodiodes Digital cameras Intelligent sensors Decoding voltage Consumer products

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A miniaturized fluorescence detection system with an integrated organic light emitting diode

A miniaturized fluorescence detection system with an integra...

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IEEE International conference on Micro Electro Mechanical Systems

作者： J.H. Kim Y.H. Kim K.S. Shin B.K. Kim Y.M. Kim Y.H. Lee S.L. Moon T.S. Kim J.Y. Kang E.G. Yang S.S. Kim B.K. Ju J.O. Park Department of Electrical Engineering Korea University South Korea Korea Institute of Science and Technology Microsystem Research Center South Korea Department of Physics Korea University South Korea

The organic light emitting diode (OLED) is proposed as a novel source in the microchip because it has ideal merits (various wavelengths, thin-film structure and overall emitting) for the integration. In this paper, we fabricated finger-type PIN photodiodes for the fluorescence detection and an advanced microchip with an integrated OLED. The finger-type in the diode design extended the depletion region and its internal resistance was reduced about 32% than that of a rectangular-type. The photodiodes had 0.1 nA leakage current and 8,720 sensitivity (I/sub light//I/sub dark/) at -1 v bias. The interference filter with 32 layers (SiO/sub 2/, TiO/sub 2/) was directly deposited on the photodiode. Deposited OLEDs increased the excitation efficiency and extremely simplified the integration process. The monolithically integrated microchip had a high sensitivity of 0.256 nA//spl mu/M and the LOD (limit of detection, S/N =2) of 0.01 /spl mu/M.

关键词： Fluorescence Organic light emitting diodes Microfluidics Microchannel vertical cavity surface emitting lasers Glass optical filters Light emitting diodes Interference Substrates

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visible-NIR imaging optics for a Fourier transform spectrometer

Visible-NIR imaging optics for a Fourier transform spectrome...

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conference on current developments in Lens design and optical engineering v

作者： Thibault, S Reecht, M Lavigne, JF Desnoyers, N INO Opt Design & Optomech Grp St Foy PQ Canada

ISBN: (纸本)0819454613

We present details of optical design, opto-mechanical design and testing of a visible-NIR imaging optical system for a Fourier transform spectrometer dedicated to astronomical application at the Mont Megantic Observatory (Observatoire du Mont Megantic, OMM, located south Quebec city, Canada). design considerations as well as testing and experimental results are presented.

关键词： astronomical instrumentation optical design opto-mechanical design imaging Fourier transform spectrometer

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Small catadioptric microscope optics

Small catadioptric microscope optics

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conference on current developments in Lens design and optical engineering v

作者： Shafer, DR Chuang, YH Armstrong, JJ David Shafer Opt Design Fairfield CT 06430 USA

ISBN: (纸本)0819454613

New catadioptric objectives have been developed with large bandwidths in the DUv, high numerical apertures (NAs), and small size. This can be achieved using a single glass material. designs are specifically optimized for loose alignment tolerances and ease of manufacturability. Applications include broad band DUv imaging and high resolution immersion imaging for industrial microscopy and life sciences.

关键词： catadioptric DUv broadband microscope objective

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design and fabrication of microlens by microfluidic deposition method

Design and fabrication of microlens by microfluidic depositi...

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conference on current developments in Lens design and optical engineering v

作者： Chen, CT Chiu, CL Horng, JB Ind Technol Res Inst Optoelect & Syst Labs Hsinchu 741 Taiwan

ISBN: (纸本)0819454613

The paper presents a new processing method for design and fabrication of microlens by microfluidic deposition, in which the lenses can be formed on the media with high precise location in the fabrication process. First we may apply physical vaporization deposition (PvD) or spin coating to fabricate a thin film;secondly, the hydrophilic pattern specified by the mask of lenses can be created by photolithography, where the special lens media is made herein. Finally, the liquid solution of lens material is deposited onto the predetermined location of the lens media by the drop-on-demand fluidic actuator;thus, the microlenses are consequently formed after the complete evaporation of solvent in the solution.

关键词： microlens fabrication microfluidic deposition ink-jet

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Ultra-fast focal reducer design for ∼2m-class telescopes

Ultra-fast focal reducer design for ∼2m-class telescopes

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conference on current developments in Lens design and optical engineering v

作者： Beach, D Appl Phys Ltd Christchurch 8153 New Zealand

ISBN: (纸本)0819454613

An ultra-fast focal reducer design originally intended for use with spherical primary mirrors (published in optical engineering, February, 2003), has been adapted for use as a retro-fit for existing telescopes of similar to2m pupil diameter that have aspheric mirrors. The focal reducer has only one aspheric surface, located at the aperture stop, and can provide speeds up to f/0.75 while maintaining a wide field with pixel-limited resolution and a broad spectral passband. Examples have been computed for Ritchie-Chretien, Dall-Kirkham and Cassegrain systems, and for use at the prime focus of mirrors with non-zero conic constants.

关键词： focal reducer high speed high resolution wide angle broad spectral passband retrofit telescopes

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Development of fast camera objective for spectrograph of Mont Megantique telescope

Development of fast camera objective for spectrograph of Mon...

引用

conference on current developments in Lens design and optical engineering v

作者： Thibault, S Wang, M Bernier, S INO Opt Design Grp St Foy G1P 4S4 PQ Canada

ISBN: (纸本)0819454613

A fast (F/1.55) and wide-angle refractive camera objective has been developed to work with a large-size CCD on the focal plane of the spectrograph of Mont Megantique telescope for large spectral coverage from Uv to vIS and up to NIR. The novel camera objective has been designed and optimized with three different glass combinations in order to have higher throughputs for large spectral coverage, especially in Uv region. The tolerance analysis of the camera objective is given in the paper. The final opto-mechanical design of the objective is discussed with the consideration of the manufacturing tolerance in the optical and mechanical parts, as given in this paper. The used components have been minimized to reduce the light inherent lost. The optical testing results displayed the good optical performance of the camera with the required resolution for the whole FOv, as predicted by the optical simulation and computation. The broadband AR coating, enhanced on Uv region, have been used on each surface of the lenses in the optical system.

关键词： optical engineering fast spectrograph camera opto-mechanical design astronomical instrumentation

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Saddle points in the merit function landscape of systems of thin lenses in contact

Saddle points in the merit function landscape of systems of ...

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conference on current developments in Lens design and optical engineering v

作者： Bociort, F Serebriakov, A van Turnhout, M Delft Univ Technol Opt Res Grp NL-2628 CJ Delft Netherlands

ISBN: (纸本)0819454613

The merit function landscape of systems of thin lenses in contact, which are perhaps the simplest possible types of optical systems, shows remarkable regularities. It is easier to understand how the optimization parameter space of these simple systems is divided into basins of attraction for the various local minima if one focuses on the (Morse index 1) saddle points in the landscape rather than on the local minima themselves. The existence and the basic properties of these saddle points can be predicted by thin-lens theory, which is applied on a simplified model of the merit function containing only third-order spherical aberration. The predictions of this simplified model are confirmed by numerical results obtained with a typical merit function based on ray tracing.

关键词： global optimization saddle points thin lens theory spherical aberration optical system design

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Fiber-optical system for visualization of inner pipe defects by microrobot.

Fiber-optical system for visualization of inner pipe defects...

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conference on current developments in Lens design and optical engineering v

作者： Gradetsky, v Krabchuk, L Kniazkov, M Solovtsov, v Tulaikova, T Simakova, M Russian Acad Sci Inst Prob Mech Moscow 119526 Russia

ISBN: (纸本)0819454613

The control systems of the miniature robots are suggested for their motion over internal surfaces inside of the small diameter tubes. The mechanical system information-measuring sensor and control systems are considered. Three versions of the mechanical systems are suggested: electromagnetic, triad wheels and conversion of rotation motion to translation one. The electromagnetic mechanism use push pull tipe method for translation motion realization. Developed schemes in the modules design of control systems were checked experimentally on the robot's prototypes. Some results of the computer simulation illustrate the multilink robot control motion along the internal diameters of the tubes. This work was fulfilled under financial support of the Russian Found of Fundamental researches N 01-01-00913 and in frames of Federal Multi Purpose Scientific and Technical Program of Ministry of Industry, Science and Technologies: "Researches and developments on priority directions of science and technology", "Knowledgeable basic investigations" block, "Basic investigations at the field of physics sciences" part Mechanics.

关键词： minirobot in-tube motion mechanical system control algorithms on-board microprocessor control schemes

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