检索结果-内蒙古大学图书馆

Conference on MEMS/MOEMS Components and Their applications ii

作者： Li, B Gerace, S Chen, QF Univ Cent Florida MEMS Orlando FL 32816 USA

ISBN: (纸本)0819456918

Compact robust hydraulic actuators are very important for space related applications because of their capability of producing much larger forces per unite volume/mass than existing technologies. The major components of these actuators are PZT stacks (pusher) and microvalves. The PZT pusher works at high frequencies to produce large flow rates (proportional to displacement traveled) and high pressures. As a component of the hydraulic actuator, the microvalves are challenged in matching the requirements of the PZT in terms of high operational frequencies, large flow rates and high-pressure support capabilities. In order to fulfill these requirements, the authors have developed robust self-assembled solid nickel micro valve arrays consisting of 80 single micro check valves, to achieve the required flow rate (> 10 cc/second). A single micro check valve consists of an inlet channel (200 mu m in diameter), a specially designed valve flap held by four identical micro beams, and outlet channels. All these structures are made from electroformed nickel and are self-assembled during a novel in situ UV-LIGA fabrication process. Finite element simulation results show that the micro check valve has a 1(st) resonant frequency of 16 kHz and is able to support pressures greater than 10 MPa. Test results show the flow rate is 19 cc/s at a pressure difference of 100 psi, and is roughly proportional to the pressure applied. Based on Poiseuille's law, it is reasonable to predict larger flow rates if higher-pressure differences are applied.

关键词： microvalve hydraulic actuators large flow rate high pressure high frequency UV-LIGA self-assemble

来源：评论

学校读者我要写书评

暂无评论

sensor technologies for monitoring metabolic activity in single cells - Part ii: Nonoptical methods and applications

引用

IEEE sensorS JOURNAL 2004年第4期4卷 412-429页

作者： Yotter, RA Wilson, DM Univ Washington Dept Elect Engn Seattle WA 98195 USA

A review of solid-state chemical and electrochemical sensors to detect, metabolic activity at the extracellular, single-cell level is presented in the context of the development of lab-on-a-chip research instrumentation. Metabolic processes in cells are briefly reviewed with the goal of quantifying the role of metabolites within the cell. sensors reviewed include both research and commercial devices that can noninvasively detect extracellular metabolites, including oxygen, carbon dioxide, and glucose.. Metabolic activity can also be sensed nonselectively by measuring pH gradients. Performance metrics, such as sensitivity, sensor size, drift, time response, and sensing range, are included when available. Highly suitable sensor technologies for,monitoring cellular metabolic activity include electrochemical sensors, scanning electrochemical microscopy, ion-sensitive field effect transistor sensors, and solid-state light-addressable potentiometric sensors. Other less-suitable, but still potentially viable, solid-state sensing technologies are also reviewed briefly, including resonant chemical sensors (surface acoustic wave and quartz crystal microbalance), conductivity or impedance sensors, and sensors with multiple transduction stages. Specific biological applications which benefit from detection of extracellular metabolic events at the single-cell level are discussed to provide context to the practical use of these sensor technologies;these applications include case studies of various diseases (cancer, diabetes, mitochondrial disorders. etc.), cell and tissue differentiation;cell and tissue storage;cell life cycle and basic cellular processes;and developmental biology.

关键词： carbon dioxide sensors cell metabolic activity chemical sensors electrochemical sensors glucose sensors ion-selective membranes ion-sensitive field effect transistor (ISFET) light-addressable potentiometric sensors (LAPS) microelectrodes oxygen sensors pH sensors quartz crystal microbalance scanning electrochemical microscopy (SECM) single-cell detection surface acoustic wave

来源：评论

学校读者我要写书评

暂无评论

All solid state imaging infrared/imaging LADAR sensor system

All solid state imaging infrared/imaging LADAR sensor system

引用

Conference on Optical Sensing

作者： Barenz, J Baumann, R Imkenberg, F Krogmann, D Tholl, HD Bodenseewerk Geraetetech GmbH D-88641 Uberlingen Germany

ISBN: (纸本)0819453811

A compact dual mode sensor is under development at BGT addressing autonomous guidance, target detection and classification/identification for several military and civilian applications. The dual mode sensor consists of an imaging infrared sensor and an imaging Ladar sensor both in snapshot mode. This paper presents the concept of the dual mode sensor and shows the current development status. Critical components such as a compact laser source, fiber-array for image plane sampling, wavelength selective infrared beam splitter and micro-lens arrays for Ladar field-of-view steering are presented in detail.

关键词： dual mode sensor 3D-Ladar fiber amplifier fiber-array micro-lens array autonomous guidance autonomous target recognition

来源：评论

学校读者我要写书评

暂无评论

High-speed, high-sensitivity, low-noise scientific CMOS image sensors

High-speed, high-sensitivity, low-noise scientific CMOS imag...

引用

Conference on Microelectronics - Design, Technology and Packaging

作者： Kleinfelder, S Univ Calif Irvine Irvine CA 92697 USA

ISBN: (纸本)0819451673

Image sensors for scientific applications face unusually demanding performance requirements for speed, sensitivity, noise, dynamic range and data throughput. Dynamic proton radiography, for example, requires both extremely high frame rates (multi-MHz) and high dynamic range (similar to80 dB). Electron microscopy, particle physics, nuclear science and astrophysics applications requires high sensitivity and low noise for single-photon/single charged particle efficiency, often in extremely large (>100 M-pixel) arrays with tremendous sustained throughput (>50 G-pixels/s) and radiation-tolerance. This paper covers recent research results that extend standard CMOS image sensor performance in these areas. Signal to noise ratios as high as 90 dB have been achieved using a new, low-overhead, column-level active reset technique. This image sensor achieves output noise levels of similar to45 microvolts, rms, without the use of correlated double sampling. Enhanced sensitivity for single-photon detection has been obtained by using an epitaxial silicon region as a higher cross-section CMOS sensor, with low-capacitance diode or large-area pbotogate charge collection. This development has made possible the use of standard 0.25 micrometer digital CMOS sensor arrays in place of expensive hybrid high-resistivity silicon sensor focal plane arrays plus CMOS readout circuit combinations. High-speed transient image sensors with frame rates as high as 10 M-frames/s, combined with 13-bit resolution, has been achieved using on-focal-plane frame storage. Fabricated in a standard digital 0.35 micrometer digital CMOS technology, the latter device includes a photodetector, a charge-integrating amplifier and an array of 64 sample circuits per pixel. Finally, a 100+ M-frames/s solid-state "streak camera" prototype is discussed which, in conjunction with the possible use of 3-D packaging techniques, may yield a sensor array capable of acquiring images at rates exceeding 10 T-pixels/s.

关键词： high-speed low noise active reset CMOS image sensor streak camera

来源：评论

学校读者我要写书评

暂无评论

New readout integrated circuits for position sensitive solid state detectors

New readout integrated circuits for position sensitive solid...

引用

IEEE Symposium on Nuclear Science (NSS/MIC)

作者： T.O. Tumer V.B. Cajipe R.F. Calderwood M. Clajus S. Hayakawa Shi Yin NOVA Research and Development Inc. Riverside CA USA

We have been developing custom multi channel mixed signal readout integrated circuits (ICs) for advanced position sensitive solid-state radiation detector arrays for applications ranging from X-ray astronomy and medical imaging to security and industrial inspection. Readout ICs are an integral part of position-sensitive semiconductor detectors for X-ray, gamma-ray and charged particle imaging. Different detector applications require custom IC, which is typically designed for a specific detector array. Therefore, it is important to develop generic ICs to meet a range of applications in different complementing fields. To achieve this aim NOVA has been developing generic ICs for different fields of applications, which embodies versatile and adaptable functions as well as selectable features. An overview of generic ICs developed at NOVA is presented here. Each chip described targets a complementing application field with versatile functions and features.

关键词： solid state circuits Position sensitive particle detectors Application specific integrated circuits sensor arrays X-ray imaging Radiation detector circuits Astronomy Biomedical imaging Security Inspection

来源：评论

学校读者我要写书评

暂无评论

Integrated readout electronics: enabling advanced applications of position-sensitive solid-state radiation detectors

Integrated readout electronics: enabling advanced applicatio...

引用

IEEE Symposium on Nuclear Science (NSS/MIC)

作者： V.B. Cajipe R.F. Calderwood M. Clajus S. Hayakawa T.O. Tumer Shi Yin NOVA Research and Development Inc. Riverside CA USA

As applications of advanced solid-state radiation detector arrays proliferate across disciplines ranging from X-ray astronomy and medical imaging to security and industrial inspection, the relative scarcity of low-noise, multi-channel integrated circuits (ICs) needed to read out these arrays has become increasingly apparent. In fact, readout ICs are now regarded to be an integral part of position-sensitive semiconductor detectors for X-ray and gamma-ray imaging. Because the requirements of various detector applications tend to be diverse, a custom IC is typically designed for a specific detector array. This often lengthens the time and raises the cost of system development. To help close the readout technology gap and facilitate advances in this field, NOVA has been formulating strategies for instrumenting different detectors of a given application category with the same "generic" IC which embodies common functions as well as selectable features. A brief overview of possible approaches to such generic ICs will be given. Within this context, accomplishments and ongoing efforts at NOVA in developing front-end ICs for various detector architectures and signal-processing scenarios will be described. We will especially consider the case of ICs used in conjunction with position-sensitive CZT detectors, implemented in traditional soldered lead or flip-chip connection geometries, to perform spectroscopic, energy-binning or current-mode type measurements

关键词： Readout electronics solid state circuits Radiation detectors sensor arrays Application specific integrated circuits X-ray imaging Position sensitive particle detectors Radiation detector circuits Astronomy Biomedical imaging

来源：评论

学校读者我要写书评

暂无评论

A colour 3200fps high-speed CMOS imager for endoscopy in bio-medical applications

A colour 3200fps high-speed CMOS imager for endoscopy in bio...

引用

European Conference on solid-state Circuits (ESSCIRC)

作者： F. Lustenberger M. Lehmann L. Cavalier N. Blanc W. Heppner J. Ernst S. Gick H. Bloss Photonics Division CSEM SA Zürich Switzerland Fraunhofer USB Erlangen Germany Fraunhofer IIS Erlangen Germany

A high-speed, high-sensitivity sensor was developed in a standard 0.5 /spl mu/m CMOS mixed-signal technology for the use in endoscopes. The full frame rate in excess of 3200 frames per second enables the imaging of transient events in biomedical samples. The sensor is organized as a 512/spl times/192 pixel array with additional RGB dye filters. Data are transferred from the sensor on either 4 or 8 analogue signal taps. The imager reaches a sensitivity of 130 V//spl mu/***/sup -2/ at a wavelength of 470 nm with a dynamic range of 62 dB and 50.2 dB in linear mode and charge-skimming mode, respectively. The FPN, PRNU and temporal noise were measured to be at 0.7%, 1.1% and 0.08% of the full-scale output range of the sensor. This excellent performance is exploited in the analysis of high-speed transient phenomena of human vocal cords.

关键词： Endoscopes Biosensors sensor arrays CMOS image sensors CMOS technology Transient analysis Standards development Biomedical imaging Filters Dynamic range

来源：评论

学校读者我要写书评

暂无评论

Test of scintillator readout with single photon avalanche photodiodes

Test of scintillator readout with single photon avalanche ph...

引用

IEEE Symposium on Nuclear Science (NSS/MIC)

作者： P. Finocchiaro L. Cosentino G. Fallica S. Lombardo M. Mazzillo F. Musumeci A. Piazza G. Privitera S. Privitera E. Rimini D. Sanfilippo E. Sciacca A. Scordino S. Tudisco INFN Laboratori Nazionali del Sud Italy Research and Development DSG STMicroelectronics Catania Italy CNR-IMM Catania Italy Università degli Studi di Catania Italy

We outline the possible applications of newly developed single photon avalanche detectors (SPAD) operating at low voltage and fabricated in silicon planar technology, reporting on tests done with scintillators. We envisage the integration of large arrays of identical sensors, employing a common read-out mode in order to achieve a high resolution and high sensitivity solid state photomultiplier. The applications of such a device would be many, particularly if we consider that we are also working on the production of micro-optical components, perfectly suited for the lossless coupling of these photosensors to several light sources (lasers, ordinary and scintillating fibres, scintillators, optical devices), by exploiting the promising DLI technology (deep lithography with ions). Crossed time-of-flight and amplitude measurements between SPADs and usual photomultipliers, coupled to scintillators, have allowed to compare their relative performance. Specific issues regarding the SPAD and the scintillating fibre readout are presented, also in view of possible applications in the field of particle/radiation tracking systems.

关键词： Testing Avalanche photodiodes sensor arrays Optoelectronic and photonic sensors Photomultipliers Optical fiber devices Detectors Low voltage Silicon solid state circuits

来源：评论

学校读者我要写书评

暂无评论

development of a Mixed-Mode Pixel Array Detector for macromolecular crystallography

Development of a Mixed-Mode Pixel Array Detector for macromo...

引用

IEEE Symposium on Nuclear Science (NSS/MIC)

作者： S.G. Angello F. Augustine A. Ercan S.M. Gruner R.C. Hamlin T. Hontz Ng.H. Xuong M.J. Renzi D.R. Schuette M.W. Tate W. Vernon Area Detector Systems Corporation Poway CA USA Augustine Engineering Encinitas CA USA Department of Applied and Engineering Physics Cornell University Ithaca NY USA CHESS The Physics Department Cornell University Ithaca NY USA Department of Chemistry and Biochemistry University of California San Diego San Diego CA USA MIT Lincoln Laboratories Lexington MA USA Physics Department Cornell University Ithaca NY USA Laboratory of Atomic and Solid State Physics Cornell University Ithaca NY USA

A Mixed-Mode Pixel Array Detector (MMPAD) has been conceived for protein crystallography applications. The most notable feature of the detector is the combination of analog and digital approaches used in the pixel to generate very large dynamic range, low dead time, and fast readout of the types of spot intensity measurements needed in X-ray images from large macromolecules. Prototype structures for the pixel have been fabricated and evaluated and indicate that an intensity range of 10/sup 7/ to 1 can be measured with a precision of 0.25%, while still maintaining a high DQE for X-rays in the 6-18 keV range. The mixed-mode structure is compatible with a fast I/O system and allows the possibility of full-frame readout in the ms range. We present details of pixel behavior, design of support electronics, hybridization results and plans for fabrication of large arrays.

关键词： sensor arrays Crystallography X-ray imaging Proteins Computer vision X-ray detection X-ray detectors Pixel Dynamic range Time measurement

来源：评论

学校读者我要写书评

暂无评论

Chemical and biological sensors based on optically confined birefringent chalcopyrite heterostructures

引用

MATERIALS SCIENCE AND ENGINEERING B-solid state MATERIALS FOR ADVANCED TECHNOLOGY 2003年第2期97卷 182-195页

作者： Dietz, N Madarasz, FL Xoetron LLC Ringoes NJ 08551 USA Georgia State Univ Dept Phys & Astron Atlanta GA 30303 USA

This paper introduces and discusses the design and application(s) of a new and unique integrated solid-state molecular sensor (SSMS) system. The SSMS is based on optically confined birefringent heterostructure technology, which has the capability of recognizing target chemicals and biological molecules in an ambient environment. The SSMS technology is applicable for miniaturized sensor devices that can be used for quick, remote screening and recognition of chemical hazards in the environment. For example, trace impurities related to air/water pollution can be continuously monitored. Just as important, however, the SSMS technology will have a worldwide impact-economically as well as technologically-when used in the detection of chemical and biological agents, as well as for a variety of medical sensing applications, such as to identify and monitor complex biological structures, test for allergic reactions and screen for common diseases. Moreover, it could hasten the time of development and introduction into the marketplace of critically needed new drugs by the monitoring of biochemical and molecular cellular responses to the candidate drugs. Materials selection criteria, growth parameters and device architecture requirements are given and discussed. In addition, the results of a recent phase matching calculation, substantiating the feasibility of the SSMS, are given and discussed. Published by Elsevier Science B.V.

关键词： ii-IV-V-2 chalcopyrites birefringent NLO thin films heterostructures mixed-mode phase matching nonlinear coupled waveguides frequency agile laser molecular sensor chemical/biological agents

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：