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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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High-speed impedance measurement for inline process control of hot-rolled rods

High-speed impedance measurement for inline process control ...

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International Workshop on Impedance Spectroscopy

作者： Weidenmuller, J. Sehestedt, C. Kanoun, O. Himmel, J. Laboratory for Sensor Technology and Measurement Engineering University of Applied Sciences Koblenz Germany Fakultät Für Elektro- und Informationstechnik Technische Universität Chemnitz Germany

ISBN: (纸本)9780415684057

For the rod shape measurement of hot rolled round steel bars (rods) the high frequency eddy current method is especially well suited as it requires no contact point and is not limited to bellow the Curie Temperature. Defects of the rod's shape can be detected by measuring the impedance spectrum of the RLC-oscillator. In the first laboratory setup ( Weidenmuller, Knopf, Sehestedt, and Himmel 2008) an Agilent Impedance Analyser was used for initial tests. Nevertheless, this setup cannot be applied in a steel plant due to the difficult environmental conditions and low data acquisition rate. Hence, a Vector Network Analyser for passive impedance measurement that is applicable in these surroundings was developed, (Weidenmuller, Sehestedt, Kanoun, and Himmel 2009). © 2011 Taylor & Francis Group, London.

关键词： Data acquisition

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Shape-Controlled Synthesis and Related Growth Mechanism of Pb（OH）2 Nanorods by Solution-Phase Reaction

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Chinese Physics Letters 2010年第5期27卷 223-226页

作者：程进邹小平宋维力曹茂盛苏燚杨刚强吕学明张福学 School of Electronic Engineering Beijing University of Posts and Telecommunications Beijing 100876 Research Center for Sensor Technology Beijing Key Laboratory for Sensor Beijing Information Science and Technology University Jianxiangqiao Campus Beijing 100101 Ministry-of-Education Key Laboratory for Modern Measurement and Control Technology Beijing 100101 School of Material Science and Engineering Beijing Institute of Technology Beijing 100081

We present a simple method to synthesize Pb（OH）2 nanorods by solution-phase reaction. Rod-like lead hydroxide precipitates are obtained by mixing lead nitrate with a concentration of about 0.01 M and potassium hydroxide with concentration of about O.03 M in an aqueous solution. Sodium chloride as an additive is premixed with the lead nitrate aqueous solution. The presence of chloride ions in the precursor solution results in the rod-like morphology of lead hydroxide precipitates. The growth mechanism of the lead hydroxide nanorods is discussed.

关键词： INORGANIC compounds -- Synthesis CRYSTAL growth LEAD compounds SOLUTION (Chemistry) PRECIPITATION (Chemistry) NANOSTRUCTURED materials

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Chlorine gas sensors using hybrid organic semiconductors of PANI/ZnPcCl_(16)

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Journal of Semiconductors 2010年第8期31卷 88-92页

作者：雷廷平施云波吕文龙刘洋陶巍袁鹏亮林立伟孙道恒王立权 College of Physics and Mechanical & Electrical Engineering Xiamen University Mechanical Engineering Center for Post-doctoral Studies Harbin Engineering University Higher Educational Key Laboratory for Measuring & Control Technology and Instrumentations of Heilongjiang Province School of Measurement Control Tech & Communications EngineeringHarbin University of Science and Technology Qingyang Secondary Specialized School of Science and Technology Department of Mechanical Engineering and Berkeley Sensor and Actuator Center University of CaliforniaBerkeleyCalifornia 94720USA

PANI/ZnPcCl_（16）（polyaniline doped with sulfosalicylic acid/hexadecachloro zinc phthalocyanine） powders were vacuum co-deposited onto Si substrates,where Pt interdigitated electrodes were made by *** PANI/ZnPcCl_（16） films were characterized and analyzed by SEM,and the influencing factors on its intrinsic performance were analyzed and sensitivities of the sensors were investigated by exposure to chlorine（Cl_2） *** results showed that powders prepared with a stoichiometric ratio of（ZnPcCl_（16））_（0.6）（PANI）_（0.4） had a preferential sensitivity to Cl_2 gas, superior to those prepared otherwise;the optimal vacuum co-deposition conditions for the films are a substrate temperature of 160℃,an evaporation temperature of 425℃and a film thickness of 75 nm;elevating the operation temperature （above 100℃） or increasing the gas concentration（over 100 ppm） would improve the response characteristics,but there should be upper levels for ***,the gas sensing mechanism of PANI/ZnPcCl_（16） films was also discussed.

关键词： PANI/ZnPcCl_（16） hybrid organic semiconductors chlorine gas sensors vacuum co-deposition

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Diversification of the eddy current technology

Diversification of the eddy current technology

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International Multi-Conference on Systems, Signals and Devices

作者： Himmel, J. Heidary Dastjerdi, M. Knopf, C. Sehestedt, C. Weidenmüller, J. Kanoun, O. Institute of Sensor Technology and Measurement Engineering University of Applied Sciences Ruhr West 45468 Mülheim an der Ruhr Germany Laboratory for Sensor Technology and Measurement Engineering University of Applied Sciences Koblenz Rhein Ahr Campus 53424 Remagen Germany Fakultät für Elektro- und Informationstechnik Technische Universität Chemnitz 09111 Chemnitz Germany

ISBN: (纸本)9781424475346

In metrology eddy current non-contact transducer have been widely used for measurement of position, displacement, cracks, vibration, proximity and alignment, as well as parts sorting applications over the past years. By reason of further developments of front end sensor elements as well as electronics, new application areas of eddy current sensors are technically feasible. In this paper lately achieved results in eddy current sensor developments will be presented. ©2010 IEEE.

关键词： crack measurement displacement measurement eddy current eddy current noncontact transducer eddy current sensor eddy currents gradiometer position measurement process control rolling mill sensors tissue diagnostics transducers vibration measurement

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Diversification of the eddy current technology

Diversification of the eddy current technology

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

作者： J. Himmel M. Heidary Dastjerdi C. Knopf C. Sehestedt J. Weidenmüller O. Kanoun Institute of Sensor Technology and Measurement Engineering University of Applied Sciences Ruhr West Mülheim an der Ruhr Germany Laboratory for Sensor Technology and Measurement Engineering University of Applied Sciences Koblenz Remagen Germany Fakultät für Elektro- und Informationstechnik Technische Universität Chemnitz Chemnitz Germany

关键词： Temperature measurement Biomedical imaging Electronic mail Legged locomotion Temperature sensors Biology

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Synthesis of β-PbO micro-octahedrons by electrodeposition

Synthesis of β-PbO micro-octahedrons by electrodeposition

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作者： Cheng, Jin Zou, Xiaoping Su, Yi Yang, Gangqiang Lü, Xueming Research Centre for Sensor Technology Beijing Key Laboratory for Sensor Beijing Information Science and Technology University Beijing 100101 China School of Electronic Engineering Beijing University of Posts and Telecommunications Beijing 100876 China Ministry-of-Education Key Laboratory for Modern Measurement and Control Technology Beijing 100101 China

A simple and effective electrochemical deposition method to fabricate lead oxide micro-octahedrons is reported. Unlike previous reports in which the current densities of electrochemical deposition were normally not more than 5 mA/cm2 and resulted in the deposition of lead flakes, the current densities in our process were improved to more than 15 mA/cm2 which results in the deposition of lead oxide micro-octahedrons. Our results indicated that well-shaped lead oxide micro-octahedrons could form at current densities in the range of 1525 mA/cm2. © 2009 World Scientific Publishing Company.

关键词： Current density

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An extrinsic Fabry-Perot interferometric optical fiber sensor system for hydrogen detection

An extrinsic Fabry-Perot interferometric optical fiber senso...

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20th International Conference on Optical Fibre sensors

作者： Yang, Zhen Zhang, Min Lei, Ming Yu, Xiujuan Liao, Yanbiao Lai, Shurong Tian, Qian Li, Qisheng Zhang, Yi Zhuang, Zhi State Key Laboratory of Precision Measurement Technology and Instruments Tsinghua University Beijing China Optical Fiber Sensor Lab Dept. of Electronic Engineering Tsinghua University Beijing China Institute of Systems Engineering CAEP Mianyang Sichuan China

ISBN: (纸本)9780819478146

An extrinsic Fabry-Perot interferometric (EFPI) optical fiber hydrogen sensor based on palladium silver (Pd-Ag) film is designed for hydrogen leakage detection. The sensing mechanism of such a sensor is based on the mechanical stress that is induced in the Pd-Ag film when it absorbs hydrogen. The sensor system which is portable and suitable for field detection is formed by a conventional coupler, a low-power LED operating at 850 nm, and a high resolution miniature spectrometer. To obtain the absolute length of the EFPI air gap, a cross-correlation signal processing method is *** sensor is suitable for monitoring concentrations of hydrogen below the lower explosive limit. © 2009 SPIE.

关键词： Binary alloys

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A modified cross-correlation method for white-light optical fiber extrinsic Fabry-Perot interferometric hydrogen sensors

A modified cross-correlation method for white-light optical ...

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2009 International Conference on Optical Instruments and technology, OIT'09

作者： Yang, Zhen Zhang, Min Liao, Yanbiao Lai, Shurong Tian, Qian Li, Qisheng Zhang, Yi Zhuang, Zhi State Key Laboratory of Precision Measurement Technology and Instruments Tsinghua University Beijing China Optical Fiber Sensor Lab Dept. of Electronic Engineering Tsinghua University Beijing China Institute of Systems Engineering CAEP Mianyang Sichuan China

ISBN: (纸本)9780819478948

An extrinsic Fabry-Perot interferometric (EFPI) optical fiber hydrogen sensor based on palladium silver (Pd-Ag) film is designed for hydrogen leakage detection. A modified cross correlation signal processing method for an optical fiber EFPI hydrogen sensor is *** the applying of a special correlating factor which advises the effect on the fringe visibility of the gap length and wavelength, the cross correlation method has a high accuracy which is insensitive to light source power drift or changes in attenuation in the fiber, and the segment search method is employed to reduce computation and demodulating speed is fast. The Fabry-Perot gap length resolution of better than 0.2nm is achieved in a certain concentration of hydrogen. © 2009 SPIE.

关键词： Optical fibers

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Rod shape testing by high frequency eddy current -Passive impedance measurement-

Rod shape testing by high frequency eddy current -Passive im...

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

作者： Jens Weidenmuller Christian Sehestedt Olfa Kanoun Jorg Himmel Laboratory of Sensor Technology and Measurement Engineering University of Applied Sciences Koblenz Remagen Germany Fakultät für Elektro-und Informationstechnik Technische Universität Chemnitz-Zwickau Chemnitz Germany

For the rod shape measurement of hot rolled round steel bars (rods) the high frequency eddy current method is especially well suited as it requires no contact point and is not limited to below the Curie temperature. Defects of the rod's shape can be detected by measuring the impedance spectrum of the RLC-oscillator. In the first laboratory setup an Agilent impedance analyser was used for initial tests. Nevertheless, this setup cannot be applied in a steel plant due to the difficult environmental conditions. Hence, a vector network analyser for passive impedance measurement that is applicable in these surroundings was developed.

关键词： Shape measurement Eddy current testing Eddy currents Current measurement Impedance measurement Frequency measurement Steel Bars Temperature Laboratories

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