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conference on Unattended Ground sensor Technologies and applications vii

作者： Griggs, SP Mark, MB Feldman, BJ Def Adv Res Projects Agcy Arlington VA 22203 USA

ISBN: (纸本)0819457817

DARPA Dynamic Optical Tags (DOTS) program has as its goal the development of a low cost, small, robust, persistent, low probability of intercept, 2-way tagging, tracking, and locating device that also supports error free data rates in excess of 100 kbps and can be interrogated at ranges up to and beyond 1Km. The program has selected several promising candidates for this device and is in the process of evaluating individually their performance against predetermined milestones to ascertain whether the technology is feasible and the program should continue for further development. In all cases the candidate devices operate as retro-reflecting optical modulators. Upon interrogation by a laser at the correct wavelength and with the correct code, the tags will proceed to modulate the return retro-reflection. While data for the candidate devices are not yet in hand, nevertheless this paper will provide an overview of the nature of the devices under investigation and speculate on how these devices could be employed for unattended ground sensor applications.

关键词： retro-reflecting modulators optical modulators tagging systems tracking systems

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Cogent sensors - A generic building block for advanced sensor networks.

Cogent sensors - A generic building block for advanced senso...

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SICE 2004 Annual conference

作者： Gaura, E Newman, R Coventry Univ Coventry CV1 5FB W Midlands England

ISBN: (纸本)4907764227

In this paper we examine some of the concerns in the design of systems composed of very large numbers of 'intelligent sensors'. Such systems are now being proposed as a solution for a number of advanced applications for which they have some real advantages over conventional systems. Some of these proposals, and some systems which have already been built are surveyed. The problems of configuring and maintaining such networks are examined, along with the system design issues raised. The cogent sensor, a sensor endowed with the ability to transform data to information, is put forward as an essential part of realisation of the type of applications envisaged. The design of generic, cogent sensors is also problematic, because the nature of the data-information transform depends on the application. A systems architecture which overcomes this problem is outlined.

关键词： cogent sensor sensor networks WINS

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Live Geography - Interoperable Geo-sensor Webs Enabling Portability in Monitoring applications

Live Geography - Interoperable Geo-Sensor Webs Enabling Port...

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2nd International conference on advanced Geographic Information systems, applications and Services

作者： Resch, Bernd Mittlboeck, Manfred Res Studios Austria Studio iSPACE A-5020 Salzburg Austria

ISBN: (纸本)9780769539515

In the last decade, rapidly declining sensor costs triggered intense research in sensor technologies and vice versa. This fact led to the deployment of a number of sensor networks. However, these sensor networks tend to be deployed in monolithic stovepipe-like systems, limiting interoperability and reusability of both data and workflow components. This paper presents the Live Geography approach, which stands for the integration of real-time measurement data in a fully standardised infrastructure. A particular focus of this paper is dedicated to interoperable geo-sensor webs featuring a high degree of flexibility and portability can be deployed in various monitoring use cases in a variety of application domains.

关键词： Live Geography Standardised Geo-sensors Embedded sensor Webs Interoperable Monitoring systems

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advanced border monitoring sensor system

Advanced border monitoring sensor system

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conference on sensors, and Command, Control, Communications and Intelligence (C31) Technologies for Homeland Security and Homeland Defense VI

作者： Knobler, Ronald A. Winston, Mark A. McQ Inc Fredericksburg VA 22405 USA

ISBN: (纸本)9780819471345

McQ has developed an advanced sensor system tailored for border monitoring that has been delivered as part of the SBInet program for the Department of Homeland Security (DHS). Technology developments that enhance a broad range of features are presented in this paper, which address the overall goal of the system to improving unattended ground sensor system capabilities for border monitoring applications. Specifically, this paper addresses a system definition, communications architecture, advanced signal processing to classify targets, and distributed sensor fusion processing.

关键词： unattended ground sensor sensor fusion low cost sensor distributed processing border monitoring DHS SBInet

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Optimizing the loss of one-dimensional photonic crystal towards high-sensitivity Bloch-surface-wave sensors under intensity interrogation scheme 7

Optimizing the loss of one-dimensional photonic crystal towa...

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conference on advanced sensor systems and applications vii

作者： Kong, Weijing Wan, Yuhang Du, Kun Zhao, Wenhui Wang, Shuang Zheng, Zheng Tianjin Univ Technol & Educ Sch Elect Engn 1310 Dagu South Rd Tianjin 30022 Peoples R China Beihang Univ Sch Elect & Informat Engn 37 Xueyuan Rd Beijing 100191 Peoples R China

ISBN: (数字)9781510604704

ISBN: (纸本)9781510604698;9781510604704

The reflected intensity change of the Bloch-surface-wave (BSW) resonance influenced by the loss of a truncated one-dimensional photonic crystal structure is numerically analyzed and studied in order to enhance the sensitivity of the Bloch-surface-wave-based sensors. The finite truncated one-dimensional photonic crystal structure is designed to be able to excite BSW mode for water (n= 1.33) as the external medium and for p-polarized plane wave incident light. The intensity interrogation scheme which can be operated on a typical Kretschmann prism-coupling configuration by measuring the reflected intensity change of the resonance dip is investigated to optimize the sensitivity. A figure of merit (FOM) is introduced to measure the performance of the one-dimensional photonic crystal multilayer structure under the scheme. The detection sensitivities are calculated under different device parameters with a refractive index change corresponding to different solutions of glycerol in de-ionized (DI)-water. The results show that the intensity sensitivity curve varies similarly with the FOM curve and the sensitivity of the Bloch-surface-wave sensor is greatly affected by the device loss, where an optimized loss value can be got. For the low-loss BSW devices, the intensity interrogation sensing sensitivity may drop sharply from the optimal value. On the other hand, the performance of the detection scheme is less affected by the higher device loss. This observation is in accordance with BSW experimental sensing demonstrations as well. The results obtained could be useful for improving the performance of the Bloch-surface-wave sensors for the investigated sensing scheme.

关键词： Bloch surface waves optical sensor photonic crystals loss

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advanced Bio-Inspired Plausibility Checking in a Wireless sensor Network Using Neuro-Immune systems Autonomous Fault Diagnosis in an Intelligent Transportation System

Advanced Bio-Inspired Plausibility Checking in a Wireless Se...

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4th International conference on sensor Technologies and applications (sensorCOMM)

作者： Jabbari, Amir Lang, Walter Univ Bremen Dept Elect Engn Inst Micro Sensors Actuators & Syst Bremen Germany

ISBN: (纸本)9780769533308

Recent developments in wireless sensing technology lead to implement advanced algorithms for distributed data processing in various applications;intelligent transportation system is one of the main applications of the advanced networked sensing technology to monitor the environmental conditions for controlling the quality of the products. To ensure the desired performance of a wireless sensor network, the reliability of the network records needs to be evaluated using an efficient data processing algorithm. In this paper, a new application of a bio-inspired technique is introduced for autonomous plausibility checking in a wireless sensor network;at first, an optimized Neuro-immune system is introduced and developed to predict the sensor records;then, performance of the proposed Neuro-immune system is compared with a neural network approximation mechanism. A secondary algorithm evaluates the sensor records to check the plausibility of the records in the wireless sensor network. The proposed data processing algorithm could serve in various applications of wireless sensor networks.

关键词： wireless sensor network distributed data processing artificial immune system artificial neural network

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Low-loss Waveguides and Devices for Compact THz systems

Low-loss Waveguides and Devices for Compact THz Systems

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conference on Terahertz Physics, Devices, and systems vii - advanced applications in Industry and Defense

作者： Rahman, B. M. A. Uthman, M. Quadir, A. Kejalakshmy, N. Markides, C. Themistos, C. City Univ London Northampton Sq London EC1V 0HB England

ISBN: (纸本)9780819495075

A rigorous full-vectorial modal solution approach based on the finite element method is used to find the propagation properties of THz waveguides. Design approaches are presented to reduce the modal loss. Design of several THz devices, including quantum cascade lasers, plasmonic waveguides, power splitters and narrow-band filters are also presented.

关键词： THz waveguides THz devices finite element method

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A new hybrid current sensor for high-voltage applications

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IEEE TRANSACTIONS ON POWER DELIVERY 2005年第1期20卷 32-38页

作者： Bull, JD Jaeger, NAF Rahmatian, F Univ British Columbia Dept Elect & Comp Engn Vancouver BC V6T 1Z4 Canada NxtPhase Corp Vancouver BC V5M 1Z4 Canada

This article presents a new hybrid electro-optic/inductive current sensor for metering and protective relaying applications. The-sensor combines a Rogowski coil with a passive integrator located in the high-voltage environment. An integrated-optic Pockels cell (IOPC) having integrated electrodes provides optical isolation. Test results from 30 A to 30 kA show the sensor to be highly linear, exceeding 0.2% linearity standards. Temperature cycling tests show the ratio error to have a maximum value, of 0.3% over the -30 to +70 degreesC range.

关键词： current measurement electro-optic measurements frequency response high-voltage techniques integrators transient response

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CMOS image sensor with organic photoconductive layer having narrow absorption band and proposal of stack type solid-state image sensors

CMOS image sensor with organic photoconductive layer having ...

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conference on sensors, Cameras and systems for Scientific/Industrial applications vii

作者： Takada, S Ihama, M Inuiya, M Fuji Photo Film Co Ltd Res & Dev Management Headquarters 210 Nakanuma Minamiashigara Kanagawa 2500193 Japan

ISBN: (纸本)0819461083

Digital still cameras overtook film cameras in Japanese market in 2000 in terms of sales volume owing to their versatile functions. However, the image-capturing capabilities such as sensitivity and latitude of color films are still superior to those of digital image sensors. In this paper, we attribute the cause for the high performance of color films to their multi-layered structure, and propose the solid-state image sensors with stacked organic photoconductive layers having narrow absorption bands on CMOS read-out circuits.

关键词： CMOS image sensor organic photoconductive layer stack type solid-state image sensor

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A spherical-structure based fiber sensor for simultaneous measurement of ammonia gas concentration and temperature 7

A spherical-structure based fiber sensor for simultaneous me...

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conference on advanced sensor systems and applications vii

作者： Han, Wei Liu, Dejun Lian, Xiaokang Mallik, Arun Kumar Wei, Fangfang Sun, Lei Farrell, Gerald Semenova, Yuliya Wu, Qiang Dublin Inst Technol Photon Res Ctr Kevin St Dublin 8 Ireland Northumbria Univ Dept Phys & Elect Engn Newcastle Upon Tyne NE1 8ST Tyne & Wear England Beijing Univ Posts & Telecommun State Key Lab Informat Photon & Opt Commun Beijing 100876 Peoples R China

ISBN: (数字)9781510604704

ISBN: (纸本)9781510604698;9781510604704

A novel fiber sensor for simultaneous measurement of ammonia gas concentration and temperature is proposed. The sensor is fabricated from two sections of single-mode fiber which are cleaved and then a fusion splicer and which is then used to fabricate spherically shaped structures at the end facets. The fusion arc is used to soften the glass which naturally assumes a spherical shape due to surface tension. A short section of multimode fiber is then fusion spliced with the two spherical-shaped ends of the single mode fibers so both the core modes and the cladding modes of the multimode fiber are excited to create two kinds of interference dips: One is created by core modes only which is not sensitive to ammonia gas since the core is isolated by the cladding so the effective refractive index of the core does not change when the refractive index of the environment changes, The other dip is created by the coupling of the core mode and cladding mod, which with a suitable coating is sensitive to ammonia gas. Silica sol-gel was prepared and coated on the fiber surface as a sensing layer for detecting ammonia gas concentration. The experimental results show that the two dips have linear wavelength shift responses but with different sensitivities to ammonia gas concentration (5.03x10(-4)nm/ppm for dip1 and -2.5x10(-5)nm/ppm for dip2) and temperature (0.0067 nm/degrees C for dip1 and 0.0149 nm/degrees C for dip2. By constructing a wavelength shifts matrix for the two dips vs. ammonia gas concentration and temperature, both the ammonia gas concentration and temperature can be measured simultaneously.

关键词： fiber sensor ammonia sensing temperature sensing multi-parametric sensing

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