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First Deminsys (high speed FBG interrogator) flight

First Deminsys (high speed FBG interrogator) flight

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conference on Health Monitoring of Structural and Biological Systems

作者： van Els, thomas J. Technobis Fibre Technol Furkapas 4 NL-5624 MD Eindhoven Netherlands

ISBN: (纸本)9780819475558

Deminsys is the world's fastest multi sensor / multi channel FBG interrogator, identifies one till four channels with typically 8 sensors per channel. the system is especially developed for the interrogation of signals up to 19,3 kHz for each sensor and the sample frequency is independent of the number of sensors. By having multiple sensors per fibre you can create a very compact network of sensors. Due to its revolutionary (light weight, compact and solid state) design, Deminsys seems to fit perfectly into (research) programs for aerospace, medic & life science, maritime, industrial, crash test and all other fast detection applications. Technobis Fibre Technologies (TFT) and NLR made a first test flight with the Deminsys optical fibre measurement system using the NLR test aircraft on October 24th 2008. this flight was a first step in the further development of the current system in order to make it suitable for operation on-board an aircraft and bring it from TRL3 towards TRL5, a functional model for aerospace applications.

关键词： Sensors Fiber Bragg gratings Aerospace engineering Temperature metrology Environmental sensing Fiber optics sensors Skin Data analysis Glasses optical testing

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Terahertz CMOS circuit design and applications for ultra-high data rate (>100Gbps) communication

Terahertz CMOS circuit design and applications for ultra-hig...

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2009 8th IEEE International conference on ASIC, ASICON 2009

作者： Chang, Mau-Chung Frank UCLA United States US National Academy of Engineering United States

ISBN: (纸本)9781424438686

Wedged between traditional microwave and optics, the term "Terahertz" was first named by Fleming to designate EM spectrum range from 300GHz to 3thz. It remains one of the least tapped spectra over time. Terahertz image and spectroscopic systems have drawn substantial attention recently due to their unique capabilities in detecting and/or analyzing concealed objects through fog and fabrics. the generation of practical Terahertz signals is nevertheless nontrivial and can only be accomplished by using Free-Electron Radiation, optical Lasers, Gunn Diodes and sometimes oscillators made of III-V compound based HBT/HEMTs. However, these prior arts suffer major disadvantages of size, cost, complexity, efficiency and/or even cryogenic cooling to produce meaningful signals in the notorious "Terahertz Gap". In the past, commercial CMOS technology has never been seriously considered for ultra-high frequency (>100GHz) circuit/system applications due to its limited IT (current gain cut-off frequency) and fmax (maximum frequency of oscillation). However, continuous device scaling may shift the paradigm and enable further scaled CMOS to reach Terahertz in cut-off frequencies. According to 2007 ITRS, both IT and fmax of 32nm CMOS will approach the lower bound of the Terahertz (600-800GHz, respectively). Under such circumstances, can CMOS possibly play significant roles in the coming Terahertz era, especially for needed portable systems? this question may be answered by assessing some recent circuit innovations devised for Terahertz signal generation and detection. Among mm-Wave signal generation techniques, differential push-push oscillator has been widely adopted. To attain sufficient gain for circuit oscillation, designers often select fundamental oscillation frequency f0 near fmax/2. this, however, renders the achievable oscillation frequency equivalent or lower than that of fmax. In order to alleviate such limitation, we have recently developed a Linear Superposition (LS) techni

关键词： Millimeter waves

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A low-power 0.4-22GHz CMOS cascode distributed amplifier for optical communication systems

A low-power 0.4-22GHz CMOS cascode distributed amplifier for...

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2009 16th IEEE International conference on Electronics, Circuits and Systems, ICECS 2009

作者： Ansari, Kimia T. Plett, Calvin Yagoub, Mustapha C. E. Department of Electronics Carleton University Ottawa ON K1S 5B6 Canada School of Information Technology and Engineering Ottawa University Ottawa ON K1N 6N5 Canada

ISBN: (纸本)9781424450916

A CMOS distributed amplifier operating over 0.4-22 GHz is presented. three stages of cascode gain cell are used in this design to enhanc. the gain and bandwidth performance. To improv. the stability oy the circuit, a damping resistor is added to the gate oy the common gate amplifier i. the cascode pair. Our design consumes only 8.6" mW power from a 850 mV supply voltage and this has been achieved throug. the use of large transistors with low current densities. the design is implemented in standard 0.13 μm CMOS technology. the amplifier has a unity-gain bandwidth of 22GHz, and a maximum small signal gain of 9 dB. Input and output transmission lines are matched to 50, wit. the worst case return losses oy the input and output of -6 dB and -8 dB, respectively. the chip area is only 750×1375 urn including all test pads and ESD protections. T. the best of our knowledge this i. the lowest power consumption among distributed amplifiers showin. the same small signal results. ©2009 IEEE.

关键词： CMOS integrated circuits

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Organic sensors for explosive detection

Organic sensors for explosive detection

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International conference on Computers and Devices for Communication (CODEC)

作者： Ravishankar S. Dudhe Seena V. Soumyo Mukherji Anil Kumar Ramgopal Rao Department of Electrical Engineering Indian Institute of Technology Bombay Mumbai INDIA School of Bio-sciences & Engineering Indian Institute of Technology Bombay Mumbai INDIA Department of Chemistry Indian Institute of Technology Bombay Mumbai INDIA

Organic field effect transistors and polymer microcantilevers are two different classes of organic sensors with potential applications in biochemical sensing. Organic field effect transistors based on poly (3-hexylthiophene) and CuII tetraphenylporphyrin composite were investigated as sensors for detection of vapors of nitrobased explosive compounds. Significant changes, suitable for sensor response, were observed in transistor -on|| current (Ion) and conductance (S) after exposure. A similar device response was, however, not observed for oxidizing agents such as benzoquinone and benzophenone. Polymer microcantilevers offer a sensitive cost effective platform for explosive gas detection. these sensors with optical and electrical transduction mechanisms were designed and fabricated using SU-8 polymer and they are further functionalized with appropriate coating for explosive detection. optical and electrical responses of respective microcantilevers to TNT vapors are also reported here.

关键词： Explosives Biosensors optical sensors optical polymers OFETs Biomedical optical imaging Costs Particle beam optics optical design Polymer films

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A low-power 0.4-22GHz CMOS cascode distributed amplifier for optical communication systems

A low-power 0.4-22GHz CMOS cascode distributed amplifier for...

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IEEE International conference on Electronics, Circuits and Systems (ICECS)

作者： Kimia T. Ansari Calvin Plett Mustapha C.E. Yagoub Department of Electronics Carleton University Ottawa ONT Canada School of Information Technology and Engineering Ottawa University Ottawa ONT Canada

ISBN: (纸本)9781424450909

A CMOS distributed amplifier operating over 0.4-22 GHz is presented. three stages of cascode gain cell are used in this design to enhance the gain and bandwidth performance. To improve the stability of the circuit, a damping resistor is added to the gate of the common gate amplifier in the cascode pair. Our design consumes only 8.6 mW power from a 850 mV supply voltage and this has been achieved through the use of large transistors with low current densities. the design is implemented in standard 0.13 ¿m CMOS technology. the amplifier has a unity-gain bandwidth of 22 GHz, and a maximum small signal gain of 9 dB. Input and output transmission lines are matched to 50 ¿, with the worst case return losses on the input and output of -6 dB and -8 dB, respectively. the chip area is only 750 × 1375 ¿m including all test pads and ESD protections. To the best of our knowledge this is the lowest power consumption among distributed amplifiers showing the same small signal results.

关键词： Distributed amplifiers optical fiber communication Performance gain Bandwidth optical amplifiers CMOS technology Circuit stability Damping Resistors Voltage

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Surface plasmon enhancement of optical absorption of thin film a-Si:H solar cells

Surface plasmon enhancement of optical absorption of thin fi...

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2009 34th IEEE Photovoltaic Specialists conference (PVSC)

作者： R. Biswas D. Zhou B. Curtin N. Chakravarty V. Dalal Department of Physics & Astronomy Ames Laboratory Iowa State University Ames IA USA Microelectronics Research Center Department of Electrical and Computer Engineering Iowa State University Ames IA USA

We design and fabricate a-Si:H solar cells with plasmonic crystal back reflectors demonstrating enhanced absorption of near infrared photons. Rigorous simulations predict plasmonic nanoparticles on ITO can increase absorption in the near infrared. Rigorous simulations also predict plasmonic crystal back reflectors with a pitch of ~750 nm to optimize the enhanced absorption. Such periodic back reflectors have been fabricated with photolithography and a-Si:H solar cells have been grown on them by PECVD. the solar cells display ~9% improvement in short circuit current and external quantum efficiency and a absorption enhancement factor exceeding 8 above 650 nm.

关键词： optical films Plasmons Photovoltaic cells Electromagnetic wave absorption Photonic crystals Predictive models Nanoparticles Indium tin oxide Circuit simulation Lithography

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Responsivity analysis of a resonant cavity QDIP at 10 µm wavelength

Responsivity analysis of a resonant cavity QDIP at 10 µm wa...

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International conference on Transparent optical Networks

作者： Ali Mir-Derikvandi Vahid Ahmadi Department of Electrical Engineering Tarbiat Moalem University Tehran Iran

ISBN: (纸本)9781424448258

In this paper, based on 8-band k.p method, we study the infrared wavelength absorption through the conduction subbands of InAs/GaAs pyramidal shape quantum dots (PSQDs) using finite difference method. Considering homogeneous and inhomogeneous broadening effects we design an asymmetric multiple barrier resonant tunnelling (AMBRT) quantum dot infrared photodetector (QDIP) for lower dark current at lambda=10 mum. Considering coverage factor of QDs, quantum efficiency (QE) of QDIP is calculated. Although absorption coefficient of QDs is large, QE is low due to their ultra short effective absorption region. To enhance QDIP-QE and consequently its responsivity an appropriate resonant cavity structure is proposed. We use InGaAs/InAlAs DBR as the bottom reflector for the designed AMBRT InAs/GaAs QDIP and Au as the top mirror. the reflectivity of the DBR is calculated by transfer matrix method. It is shown that with certain periods of InGaAs/InAlAs DBR, QE increases to about 40 times of similar conventional QDIP.

关键词： Resonance Electromagnetic wave absorption Distributed Bragg reflectors Gallium arsenide Quantum dots Indium gallium arsenide Indium compounds Shape Finite difference methods Resonant tunneling devices

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An optically passive athermal infrared optical system

An optically passive athermal infrared optical system

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conference on current developments in Lens design and optical engineering IX

作者： Li, Hua Shen, Mangzuo Chinese Acad Sci Inst Opt & Elect Chengdu 610041 Sichuan Prov Peoples R China

ISBN: (纸本)9780819472809

An optically passive athermal infrared optical system working in the 8 - 12 micron long wavelength infrared band was designed by using a special infrared optical material AMTIR (amorphous material transmitting infrared radiation). the design principle, design results are described in this paper. In addition, the optical system was incorporated with an infrared focal plane array forming an infrared camera. the thermal test of imaging quality of this camera is also presented

关键词： infrared optical system optical design athermal optical system

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design and fabrication of low-cost thermal imaging optics using precision chalcogenide glass molding

Design and fabrication of low-cost thermal imaging optics us...

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conference on current developments in Lens design and optical engineering IX

作者： Curatu, George LightPath Technol Orlando FL 32826 USA

ISBN: (纸本)9780819472809

Aspheric and diffractive surfaces in infrared materials are traditionally fabricated by single point diamond turning, which is a high-cost, low-throughput process, not suitable for low-cost, high-volume applications. Precision molding of chalcogenide glasses is a novel process we developed to allow the efficient fabrication of quality infrared optics in large volumes. In this paper we present the advantages and particularities of designing thermal imaging lenses for high-volume applications using precision molded chalcogenide glasses. As an example, we present a compact 19 mm F/1.1 infrared lens design for a 320 x 240 uncooled detector array operating from 8 to 14 microns. the excellent image quality and transmission of tested prototypes prove that precision molding of chalcogenide glasses is an ideal optical fabrication technology for the high-volume production of infrared optics.

关键词： infrared lens design thermal imaging precision glass molding chalcogenide glasses athermal design diffractive optics

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Correctly making panoramic imagery and the meaning of optical center

Correctly making panoramic imagery and the meaning of optica...

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conference on current developments in Lens design and optical engineering IX

作者： Johnson, R. Barry Alabama A&M Univ Dept Phys Normal AL 35762 USA

ISBN: (纸本)9780819472809

the production and viewing of panoramic scenes have fascinated people for over a millennium beginning with the camera obscura. With the advent of photography in the mid-1800s, techniques were developed to create panoramic scenes far larger than could be realized by a single camera. Making a panoramic scene from two or more images taken using a film camera was found to be challenging. Various advanced techniques for making panoramic images were developed during the 20(th) century and required specialized cameras and film processing. In recent years, digital cameras and powerful software programs have become readily available to aid in making panoramic imagery although often strange artifacts appears in the composite image. this is generally due to improperly locating the rotation axis of the camera. Interestingly, there is significant argument about where the axis of rotation should be for making proper panoramic imagery. the most common "answer" is the rotation axis should be about the second or rear nodal point, which will be shown in this paper to be incorrect. A second "answer" is to rotate the camera about its optical center. this is also incorrect;however, what actually constitutes the optical center of a lens and its applications will be briefly discussed. Examples of correctly and incorrectly produced panoramic image will be presented.

关键词： optical center cardinal points nodal imaging panoramic panorama Gauss Listing nodal planes

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