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3rd South African conference on sensors, MEMS, and Electro-Optical Systems (SMEOS)

作者： Schoeman, J. Univ Pretoria Dept Elect Elect & Comp Engn ZA-0002 Pretoria South Africa

ISBN: (纸本)9781628413243

Uncooled microbolometers have become extremely popular as low cost thermal detectors used in FPAs for thermal imaging cameras. Most of the emphasis of researchers have gone towards the design and optimisation of device structures, materials, processes and readout electronics with this application in mind. However, microbolometers have the potential to be utilised towards the development of alternate applications. It is well known that the thermal conduction of microbolometers depend on the pressure surrounding the device, as this governs the dominating conduction method. This work investigates the possibility of employing a Ti thinfilm microbolometer as a low pressure sensor. A well known multi-physics simulation environment is utilised to simulate the microbolometer thermoelectric response over varied atmospheric pressure conditions. These simulation results are compared with a much simpler air pressure model than previous works using microbolometers, as well as experimental data, where the fabricated prototype showed a measured device TCR of about 0.085% K-1 and a sensitivity of about 0.701 x 10(-9) W K-1 Pa-1.

关键词： Microbolometer vacuum gauge vacuum sensor micro-Pirani gauge hermetically sealed packaging FPA

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development of Bi-Spectral InAs/GaSb Type II Super lattice Image Detectors

Development of Bi-Spectral InAs/GaSb Type II Super lattice I...

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40th conference on Infrared Technology and applications

作者： Stadelmann, T. Woerl, A. Wauro, M. Daumer, V. Niemasz, J. Luppold, W. Simon, T. Riedel, M. Rehm, R. Walther, M. Fraunhofer Inst Appl Solid State Phys IAF Tullastr 72 D-79108 Freiburg Germany AIM Infrarot Module GmbII D-74072 IIeilbronn Germany

ISBN: (纸本)9781628410075

InAs/GaSb superlattices are characterized by a broken-gap type II band alignment. Their effective band gap can be engineered to match mid to long wavelength infrared (IR) photon energies. Fraunhofer IAF has developed image detectors for threat warning systems based on this material system that are capable of spatially and temporally coincident detection in two mid-IR wavelength ranges. We review the present status of the processing technology, report continuous improvements achieved in key areas of detector performance, including defect density and noise behavior, and present initial results for statistical characterization of ensembles of detector elements with respect to diode characteristics and noise.

关键词： InAs/GaSb type II superlattice infrared image sensor

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Artificial olfaction tool and techniques for safety controls in aerospace assembly and maintenance 13

Artificial olfaction tool and techniques for safety controls...

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13th IEEE sensors conference

作者： De Vito, S. Salvato, M. Massera, E. Buonanno, A. Miglietta, M. Fattoruso, G. Di Francia, G. Italian New Technol Energy & Sustainable Econ Dev ENEA Ple E Fermi 1 I-80055 Portici NA Italy

ISBN: (纸本)9781479901616

Fast response and reliability are mandatory requirements in non-destructive tests specifically in aerospace industry, for safety and efficiency reasons. Currently, the adoption of composite materials, a fundamental technology for the green aircraft concept, is limited by the lack of a validated NDT technique for the assessment of adhesive bonds quality. The latter is hampered by panels surface contamination. E-noses equipped with PARC algorithms appear a promising choice to obtain a rapid surface contamination state assessment but their dependability should be carefully analyzed. In this paper, combining real time classifiers, we show how to obtain a rapid first-hand response for the operator, retaining the possibility of increasing accuracy awaiting for the end of the e-nose measurement cycle. A reject option is casted on the base of classifier self-perceived reliability to nullify false negatives while keeping the false positive rate at minimum.

关键词： Electronic Noses Industrial applications Aerospace Industry Hybrid sensor arrays Ion Mobility Spectrometers Surface analysis Reject Option

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LPG sensing characteristics of electrospray deposited SnO2 nanoparticles

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APPLIED SURFACE SCIENCE 2014年 318卷 334-340页

作者： Gurbuz, Mevlut Gunkaya, Goktug Dogan, Aydin Ondokuz Mayis Univ Dept Mech Engn TR-55139 Samsun Turkey Anadolu Univ Dept Mat Sci & Engn TR-26555 Eskisehir Turkey Anadolu Univ Dept Glass TR-26470 Eskisehir Turkey

In this study, SnO2 films were fabricated on conductive substrate such as aluminum and platinum coated alumina using electro-spray deposition (ESD) method for gas sensor applications. Solution flow rate, coating time, substrate-nozzle distance and solid/alcohol ratio were studied to optimize SnO2 film structure. The morphology of the deposited films was characterized by stereo and scanning electron microscopy (SEM). The gas sensing properties of tin oxide films were investigated using liquid petroleum gas (LPG) for various lower explosive limit (LEL). The results obtained from microscopic analyses show that optimum SnO2 films were evaluated at flow rate of 0.05 ml/min, at distance of 6 cm, for 10 min deposition time, for 20 gSnO(2)/L-ethano, ratio and at 7 kV DC electric field. By the results obtained from the gas sensing behavior, the sensitivity of the films was increased with operating temperature. The films showed better sensitivity for 20 LEL LPG concentration at 450 C operating temperature. (C) 2014 Elsevier B.V. All rights reserved.

关键词： sensor SnO2 film Electrospray deposition Characterization

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Study of PD Ultrasonic Wave's Properties in solid Medium

Study of PD Ultrasonic Wave's Properties in Solid Medium

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3rd International conference on Energy, Environment and Sustainable development (EESD 2013)

作者： Qi, Weiqiang Li, Yanran Chen, Xiaoxin Duan, Dapeng State Grid Beijing Elect Power Res Inst Beijing 100075 Peoples R China Shanghai Jiao Tong Univ Dept Elect Engn Shanghai 200240 Peoples R China

ISBN: (纸本)9783037859728

Longitudinal ultrasonic wave signals, transverse ultrasonic wave signals and other ultrasonic body wave signals generated by partial discharge are analyzed emphatically in the acoustic emission method of partial discharge detection in high voltage equipment [1-8]. Velocity of longitudinal ultrasonic wave is often used to calculate partial discharge defects' position in the location study of partial discharge. In practical applications errors are always large. And a recent study finds that a class of plate ultrasonic guided waves will be inspired when ultrasonic body waves are transmitted from the gaseous medium to the metal medium [9-12]. As the attenuation coefficient is small and the transmission distance is large when the waves propagate along the metal plate, in the partial discharge detection, ultrasonic signals detected by the ultrasonic sensor attached to the equipment enclosure include ultrasonic guided waves besides the ultrasonic body waves.

关键词： partial discharge acoustic emission longitudinal wave transverse wave ultrasonic guided wave

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A Quality-Scalable and Energy-Efficient Approach for Spectral Analysis of Heart Rate Variability

A Quality-Scalable and Energy-Efficient Approach for Spectra...

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Design, Automation and Test in Europe conference and Exhibition (DATE)

作者： Karakonstantis, Georgios Sankaranarayanan, Aviinaash Sabry, Mohamed M. Atienza, David Burg, Andreas Ecole Polytech Fed Lausanne CH-1015 Lausanne Switzerland

ISBN: (纸本)9783981537024

Today there is a growing interest in the integration of health monitoring applications in portable devices necessitating the development of methods that improve the energy efficiency of such systems. In this paper, we present a systematic approach that enables energy-quality trade-offs in spectral analysis systems for bio-signals, which are useful in monitoring various health conditions as those associated with the heart-rate. To enable such trade-offs, the processed signals are expressed initially in a basis in which significant components that carry most of the relevant information can be easily distinguished from the parts that influence the output to a lesser extent. Such a classification allows the pruning of operations associated with the less significant signal components leading to power savings with minor quality loss since only less useful parts are pruned under the given requirements. To exploit the attributes of the modified spectral analysis system, thresholding rules are determined and adopted at design- and run-time, allowing the static or dynamic pruning of less-useful operations based on the accuracy and energy requirements. The proposed algorithm is implemented on a typical sensor node simulator and results show up-to 82% energy savings when static pruning is combined with voltage and frequency scaling, compared to the conventional algorithm in which such trade-offs were not available. In addition, experiments with numerous cardiac samples of various patients show that such energy savings come with a 4.9% average accuracy loss, which does not affect the system detection capability of sinus-arrhythmia which was used as a test case.

关键词： body sensor networks discrete wavelet transforms electrocardiography energy conservation medical signal processing patient monitoring signal classification biological signal cardiac samples energy efficiency energy-quality trade-off health monitoring application heart rate variability power spectral analysis quality scalable sensor node simulator Accuracy Algorithm design and analysis Approximation algorithms Approximation methods Complexity theory Discrete wavelet transforms Heart rate variability

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LPG sensing characteristics of electrospray deposited SnO2 nanoparticles

LPG sensing characteristics of electrospray deposited SnO2 n...

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9th Nanoscience and Nanotechnology conference (NANOTR)

关键词： sensor SnO2 film Electrospray deposition Characterization

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FDSOI applications and opportunity in China

FDSOI applications and opportunity in China

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International conference on solid-state and Integrated Circuit Technology

作者： Zhongli Liu Kai Zhao Institute of Microelectronics Chinese Academy of Sciences Beijing China Institute of Semiconductors Chinese Academy of Sciences Beijing China

ISBN: (纸本)9781479932849

Most of the electronic products are faced with a problem of energy conservation. The mobile electronic products and space applications in particular require ICs with low voltage and low power. The development for bulk Si even PDSOI CMOS in these aspects encounters a great challenge. FDSOI namely full depletion silicon on insulator is a very good alternative. When devices further scale down to the nanometer level, the advantage of energy saving of FDSOI is more prominent. This paper introduces advantages and applications of FDSOI as well as its development opportunity in China.

关键词： Random access memory Abstracts Junctions Reliability Ions Logic gates Field programmable gate arrays

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3rd International conference on Engineering and Innovative Materials, ICEIM 2014

3rd International Conference on Engineering and Innovative M...

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3rd International conference on Engineering and Innovative Materials, ICEIM 2014

ISBN: (纸本)9783038352853

The proceedings contain 54 papers. The special focus in this conference is on Structure and Properties of Materials, Research and development of Technologies of Synthesis and Environmental Chemistry and Practice of Using the Nature Materials. The topics include: Effect of cell material on the performance of PV system;zinc oxide nanostructures formed by wet oxidation of Zn foil;effect of CNT arrays on electrical and thermal conductivity of epoxy resins;FTIR and electrical studies of hexanoyl chitosan-based nanocomposite polymer electrolytes;solid particle erosion behaviour of martensitic and nitrogen alloyed austenitic stainless steel;optimization of multi-pass pocket milling parameter using ant colony optimization;investigation of carbon nanofiber supported iron catalyst preparation by deposition precipitation;recycling of pre-fabricated carbon-fiber waste as filler for sandwich glass-fiber auto parts;fabrication of ZnO nanorod for room temperature NO gas sensor;water dispersion conductive polypyrrole based on nanocrystalline cellulose;electroless deposition of silver nanoparticles and nanowires in ethylene glycol;electroless deposition of copper nanostructures in aqueous solution;simulating of backward extrusion process of nanostructured Al-6082 material;the breakdown of carbide network in a H23 tool steel by hot axisymmetric compression;cementite precipitation of a H21 tool steel after hot compression and double temper;solidification behaviour of a H21 tool steel;methane adsorption on chemically modified microwave irradiated palm shell porous carbon;hydrophobicity characterization of bio-wax derived from taro leaf for surface coating applications and the structural application of bio-composites.

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Portable solid state CW THz radar system for industrial applications

Portable solid state CW THz radar system for industrial appl...

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International conference on Infrared and Millimeter Waves

作者： A. Švigelj A. Seśek I. Kašalynas G. Valušis J. Trontelj Faculty of Electrical Engineering Laboratory for Microelectronics Ljubljana Slovenia Center for Physical Sciences and Technology A. Goštauto 11 Vilnius Lithuania

A versatile and compact solid state THz radar system operating in the continuous wave mode is described. A frequency-modulated electronic THz source is used for target illumination. On the receiver side a THz sensor array is employed to increase imaging performance. The system's performance is evaluated and application examples are shown.

关键词： Radar imaging Frequency measurement Frequency modulation arrays solids Imaging

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