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9th International Multi-Conference on Systems, Signals and Devices, SSD 2012

作者： Al-Hamry, Ammar Benchirouf, A. Dinh, N. Kanoun, O. Chemnitz University of Technology Electrical Engineering and Information Technology Department of Measurement and Sensor Technology Chemnitz Germany

ISBN: (纸本)9781467315906

Contact effects of carbon nanotubes (CNT) to metallic electrodes have a big impact on the electronic transport in CNT-based structures. In general there are two expected types of contacts, Schottky type with semiconducting tubes and ohmic contact with semiconducting and metallic tubes. However not always perfect contacts come, it is rather a tunneling barrier contact because of the weak coupling to the metal electrode or the formation of thin layer of oxides at the interface, for example. We propose a simple model for non-ideal contacts of metallic single walled nanotube (SWNT) in order to calculate the overall resistance and hence the contact resistance. The model takes into account the findings of both experiments and theories such as effect of work function, electron phonon scattering in low and high bias voltage, image potential and van der Waals distance at the interface. The model can be developed to calculate the contact resistance for strips of several SWNTs or multiwalled carbon nanotubes MWNTs. © 2012 IEEE.

关键词： Contact resistance

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Robust power supply for wireless sensors using the electrostatic field of parts under high voltage

Robust power supply for wireless sensors using the electrost...

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2012 International Conference on Smart Grid technology, Economics and Policies, SG-TEP 2012

作者： Keutel, Th. Motl, T. Bdiri, S. Viehweger, Ch. Kanoun, O. Department of Measurement and Sensor Technology Chemnitz University of Technology Germany National Engineering School of Sfax Tunisia

ISBN: (纸本)9781467359306

Reducing Technical and financial effort for the instrumentation in the harsh environment of living parts is essential. To do so, an interesting alternative has to be provided in the field of power generation and distribution, wireless and energy autonomous systems. Thereby using the electrostatic field by a capacitive voltage divider provides some advantages, but requires a specific converter structure with high input impedance. An adapted forward converter topology is presented to match the requirements of the source and also the requirements of a wireless sensor system. It is like a passive startup mechanism or a passive control signal generation. A converter prototype has been successfully analyzed within a high voltage test field in order to ensure the main functionality as a power supply for an energy autonomous system. © 2012 IEEE.

关键词： Energy harvesting

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CALIBRATION OF A NOVEL SIX-DEGREE-OF-FREEDOM FORCE/TORQUE measurement SYSTEM

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International Journal of Modern Physics: Conference Series 2013年第24期ijmpcs卷

作者： JAN SCHLEICHERT ILKO RAHNEBERG THOMAS FRÖHLICH Institute of Process Measurement and Sensor Technology Department of Mechanical Engineering Ilmenau University of Technology P.O. Box 100565 98693 Ilmenau Germany

Multi-component force/torque transducers are used in a large field of scientific and industrial applications like robotics, biomechanics and even fluid mechanics. These sensors need to be calibrated for traceable measurements. As the calibration procedure determines the measurement uncertainty, it plays an important role in sensor development for reaching the required measurement specifications. For the application in local Lorentz Force Velocimetry (Ref. 1) a six degree of freedom force/torque sensor for measurement ranges of ± 0.2 N and ± 5 mNm was developed. This sensor can also be adapted to other applications that require multi-dimensional force/torque feedback in the μN- and μNm-range such as tactile dimensional measurements and micro-manipulation. This paper discusses the calibration and the evaluation of the properties of the calibration device and the calibration procedure of the sensor system. After a brief introduction of the sensor design and its working principle the calibration setup is described and the uncertainty contributions to the forces and torques are calculated. Then the calibration procedure is presented and the resulting output signals of the sensor are depicted. As a result of the calibration, the calibration matrix is given with a discussion of its major components.

关键词： Multi-component force/torque measurement 6-DoF calibration procedures sensor development

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Lorentz Force Velocimetry for Poorly Conducting Fluids-Development and Validation of a Novel Flow Rate measurement Device

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Journal of Iron and Steel Research International 2012年第S2期19卷 613-616页

作者： WEGFRASS Andre RESAGK Christian DIETHOLD Christian FRHLICH Thomas WERNER Michael HALBEDEL Bernd THESS Andre Institute of Thermodynamics and Fluid Mechanics Department of Mechanical EngineeringIlmenau University of Technology Institute of Process Measurement and Sensor Technology Department of Mechanical EngineeringIlmenau University of Technology Institute of Inorganic-nonmetallic Materials Department of Mechanical EngineeringIlmenau University of Technology

The paper demonstrated the feasibility of Lorentz Force Velocimetry for flow rate measurements of weakly conducting electrolytes using experimental results on salt water flow exposed to a permanent magnet *** innovative flow measurement technique allows the non-contact determination of flow rates and relies on the interaction between a magnetic field and a moving conducting *** an electrically conducting fluid moves through the magnetic field a Lorentz force is generated and acts on the measurement *** present report provides an overview about the experimental setups and the first measurement results.

关键词： Lorentz force velocimetry flow measurement electrolytes non-contact measurement

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measurement and analysis of near infrared spectrum of gasoline vapor

Measurement and analysis of near infrared spectrum of gasoli...

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2012 International Meeting on Opto-Electronics engineering and Materials Research, OEMR 2012

作者： Yan, Li-ping Li, Shu Luo, Lai-gen Zhang, Min Dong, Jing-xin State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision Instruments and Mechanology Tsinghua University Beijing 100084 China Beijing POL Institute Beijing 102300 China Optical Fiber Sensor Lab Department of Electronic Engineering Tsinghua University Beijing 100084 China

ISBN: (纸本)9783037854884

In the fiber-sensing gas detection system, characteristic of near infrared absorption spectrum of the detected gas is greatly significant. The volatilized gasoline vapor is a mixture rich in various components, of which near infrared absorption spectrum shall be determined by means of experimental measurement. In this paper, an experimental platform is constructed by analyzing absorption characteristic of liquid composition in gasoline within the range of near infrared spectrum, which achieves measurement of the volatilized gasoline vapor with different concentration. In addition, reliability of this measurement method is inspected, a comparison between features of absorption spectrograms of liquid and gas is made, and linear relation of absorbance and concentration of gasoline vapor is verified. The result shows that the experimental data is acceptable and may be used as the basis of further analysis and for design of the online detecting system of gasoline vapor concentration in the hazardous environment. © (2012) Trans Tech Publications, Switzerland.

关键词： Absorbance

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Lorentz Force Velocimetry for Poorly Conducting Fluids- Development and Validation of a Novel Flow Rate measurement Device

Lorentz Force Velocimetry for Poorly Conducting Fluids- Deve...

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第七届冶金与材料电磁过程国际会议（EPM2012）

作者： WEGFRASS Andre RESAGK Christian DIETHOLD Christian FROHLICH Thomas WERNER Michael HALBEDEL Bernd THESS Andre Institute of Thermodynamics and Fluid Mechanics Department of Mechanical EngineeringIlmenau University of Technology Institute of Process Measurement and Sensor Technology Department of Mechanical EngineeringIlmenau University of Technology Institute of Inorganic-nonmetallic Materials Department of Mechanical EngineeringIlmenau University of Technology

The paper demonstrated the feasibihty of Lorentz Force Velocimetry for flow rate measurements of weakly conducting electrolytes using experimental results on salt water flow exposed to a permanent magnet *** innovative flow measurement technique allows the non-contact determination of flow rates and relies on the interaction between a magnetic field and a moving conducting *** an electrically conducting fluid moves through the magnetic field a Lorentz force is generated and acts on the measurement *** present report provides an overview about the experimental setups and the first measurement results.

关键词： Lorentz force velocimetry flow measurement electrolytes non-contact measurement

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Inkjet printing of chemiresistive sensors based on polymer and carbon nanotube networks

Inkjet printing of chemiresistive sensors based on polymer a...

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IEEE SSD International Multi-Conference on Systems, Signals and Devices

作者： P. Lorwongtragool E. Sowade T. N. Dinh O. Kanoun T. Kerdcharoen R. R. Baumann Faculty of Science Materials Science and Engineering Programme and Center of Intelligent Materials and Systems (CIMS) Mahidol University Bangkok Thailand Institute for Print and Media Technology Department of Digital Printing and Imaging Technology Chemnitz University of Technology Chemnitz Germany Measurement and Sensor Technology Chemnitz University of Technology Chemnitz Germany Faculty of Science Department of Physics Mahidol University Bangkok Thailand

ISBN: (纸本)9781467315906

We report about the manufacturing of sensor devices for detection of volatile organic compounds (VOCs) in the air. The sensor comprises three fully inkjet-printed layers of (i) silver interdigitated electrodes (SIDE), (ii) multi-walled carbon nanotubes (MWCNTs) and (iii) poly (styrene-co-maleic acid) partial isobutyl/methyl mixed ester (PSE). We have found that inkjet printing of MWCNT layers and a PSE layer on top yields an interfacial layer leading to the formation of a MWCNTs/PSE composite-like structure. The printed layers act as chemiresistive vapor sensors due to the change of electrical resistance in presence of selected VOCs. The sensor responses to various VOCs were studied by varying the concentration of the chemicals in the air between 50 and 500 ppm. The sensing mechanism can be understood as a fractional volume change of the inkjet-printed polymer that occurs during exposure to VOCs, resulting in a structural alteration of the MWCNT-polymer network. We have found that the sensor response can be defined as a function of the VOC's concentration. To investigate the morphologies of the inkjet-printed thin films, profilometry and scanning electron microscopy (SEM) were employed.

关键词： Chemical sensors Printing Polymers Resistance Carbon nanotubes Gas detectors

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Parameters effect on basic DC to DC converter structures

Parameters effect on basic DC to DC converter structures

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International Multi-Conference on Systems, Signals and Devices

作者： Ben Amor, N. Kanoun, O. Derbel, N. Sfax National School of Engineering BPW Tunisia Department of Measurement and Sensor Technology University of Chemnitz Germany

ISBN: (纸本)9781457704130

Progress in low power Very Large Scale Integration (VLSI) design open up possibilities of powering wireless devises from scavenged ambient energy. An energy management system should be designed to manage the harvested energy. DC to DC converters represent the key element in energy management systems. Knowing the diversity of DC-DC converters generally designed for specific applications, basic converters are under scope in this paper. Operation principles and simulation patterns of basic DC to DC converters are first presented. Parameter simulation occurring the effect of duty cycle, inductance, capacity and switch polarisation is studied in depth. The gaol of this paper is to show main parameters effect on output voltage behaviour. Simulation results show that the main parameters in DC-DC converters design play a key role to avoid extra-lose of harvested energy. © 2011 IEEE.

关键词： DC-DC converters

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Assessment of beef meat aging using impedance spectroscopy

Assessment of beef meat aging using impedance spectroscopy

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International Multi-Conference on Systems, Signals and Devices

作者： Guermazi, Mahdi Tröltzsch, Uwe Kanoun, Olfa Derbel, Nabil Chemnitz University of Technology Department of Measurement and Sensor Technology Reichenhainer Straße 70 09126 Chemnitz Germany University of Sfax Sfax Engineering School BP W 1173 3038 Sfax Tunisia

ISBN: (纸本)9781457704130

The aim of the paper is to assess the feasibility of impedance measurements for meat aging detection. The carried investigations are dedicated to the aging of the meat of beef. An investigation was carried out for the detection of the age of meat using 2 cases of storage in the fridge, unpacked meat, exposed in the air of the fridge (Up) and vacuum-packed meat, conserved in closed box (Vp). The measurements show a depressed semicircle in the admittance plane similar to the equivalent circuit consisting of a combination of a Constant Phase Element (CPE) and two resistors. The resistance RE various is directly proportional to meat volume resistivity. The volume resistivity is constant for Vp meat, this is due to the conservation of the same situation in the surface of contact with the electrode, this situation change for the Up meat, the volume resistivity is increasing in a linear way because the surface of contact with electrode become more dry over time. The change due to Rct is inversely proportional to the factor number of electrons involved and exchange current. The factor n.i0 decreases over time for the Up meat, This is consistent because when the meat becomes drier, the loss of liquids causes the decrease of conductivity and proportionally the decrease of the number of electrons involved and the exchange current. For the second case (Vp), the humidity causes the decrease of the number of electrons involved and the exchange current. The impedance is inversely proportional to the double layer capacitance that is consistent with the experiments. The impedance increase for the Up meat and decrease in the second case. The change due to Cdl is directly proportional to the change of meat permittivity Εr. © 2011 IEEE.

关键词： Meats

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Active probe control of a metrological Atomic Force Microscopy

Active probe control of a metrological Atomic Force Microsco...

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作者： Shen, J.C. Dorozhovets, N. Hausotte, T. Manske, E. Jywe, W.Y. Liu, C.H. Department of Automation Engineering National Formosa University Huwei Yunlin 632 Taiwan Faculty of Mechanical Engineering Institute of Process Measurement and Sensor Technology Ilmenau University of Technology Ilmenau Thuringia Germany Institute of Electro-Optical and Materials Science National Formosa University Huwei Yunlin 632 Taiwan

ISBN: (纸本)9783902661937

This article considers the force control of an active probe for Atomic Force Microscopy (AFM). Firstly, the structure of this active probe is described. For designing the force controller, the model of this active probe was identified. Based on the measured frequency response, two notch filters were used to remove the resonant peak in open-loop frequency response. Then, a PI controller was designed to regulate the force of the probe. This controller was then implemented in a Digital Signal Processor (DSP). Experimental results were given to compare the actual performance of this controller with the conventional PI controller. It is shown that the controller with notch filters reduces the control error considerably and enables faster scan speed at weaker tip-sample interaction forces. © 2011 IFAC.

关键词： Frequency response

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