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A study on degradation of spatial resolution in frequency-modulated continuous wave reflectometry due to nonlinear optical frequency sweep

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electronicS AND COMMUNICATIONS IN JAPAN PART II-electronicS 1995年第10期78卷 28-35页

作者： Wang, LT Iiyama, K Hayashi, K Faculty of Technology Kanazawa University Kanazawa Japan 920 Koichi liyama:received his B.E. M.E. and Dr. of Eng. degrees in Electronic Engineering all from Kanazawa University Kanazawa Japan in 1985 1987 and 1993 respectively. From 1987 to 1988 he worked at Yokogawa Hewlett-Packard Ltd. Since 1988 he has been working as a Research Associate in the Department of Electrical and Computer Engineering Kanazawa University and is now a Lecturer. His current research interest is fiber-optic sensors optical fiber science including Er-doped fibers optical waveguides and the optical reflectometry. Dr. liyama is a member of the IEEE and the Japan Society of Applied Physics. Members Ken-ichi Hayashi:received his B.E. degree in Electronic Engineering from Kanazawa University Kanazawa Japan in 1966 and his Dr. of Eng. degree from Nagoya University Nagoya Japan in 1977. Since 1966 he has been with the Department of Electronics Kanazawa University where he is now a Professor in the Department of Electrical and Computer Engineering. He is currently engaged in research on applications of Er-doped optical fibers fiber-optic sensors optical waveguides and optical reflectometry. Dr. Hayashi is a member of the SICE and the IEEE.

The degradation of the spatial resolution in frequency-modulated continuous wave (FMCW) reflectometry due to the nonlinearity in the optical frequency sweep are discussed both experimentally and theoretically. The response lag in the optical frequency change of a laser diode behind the injection current change was experimentally measured, showing that there were several time constants in the optical frequency response. The interference signals in the FMCW reflectometry were theoretically calculated by taking account of the response lag. From these calculations, the beat frequency becomes low just after the turning point of the optical frequency sweep;this is due to the response lag in the optical frequency response. As a result, the spectrum of the interference signal is spread out toward the low frequency region and spatial resolution is degraded. Moreover, the spatial resolution is seriously degraded with increasing the diagnosing distance due to the nonlinearity in the optical frequency sweep. The calculated results agree well with the measured results.

关键词： laser diode optical frequency sweep modulation reflectometry

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Study of inclusive baryon-antibaryon pair production of p or Λ in two-photon processes

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Zeitschrift für Physik C: Particles and Fields 1995年第1期69卷 597-606页

作者： Uehara, S. Abe, K. Amako, K. Arai, Y. Arima, T. Asano, Y. Chiba, M. Chiba, Y. Daigo, M. Fukawa, M. Fukushima, Y. Haba, J. Hamasaki, H. Hanai, H. Hemmi, Y. Higuchi, M. Hinode, F. Hirose, T. Homma, Y. Hosoda, N. Ishihara, N. Iwata, Y. Kanzaki, J. Kikuchi, R. Kondo, T. Korhonen, T.T. Kurashige, H. Matsuda, E.K. Matsui, T. Miura, M. Miyake, K. Mori, S. Nagashima, Y. Nakagawa, Y. Nakamura, T. Nakano, I. Odaka, S. Ogawa, K. Ohama, T. Ohsugi, T. Ohyama, H. Okabe, K. Okamoto, A. Ono, A. Oyama, T. Pennanen, J. Sakamoto, H. Sakuda, M. Sato, M. Sato, N. Shioden, M. Shirai, J. Shirakata, M. Sumiyoshi, T. Takada, Y. Takasaki, F. Takita, M. Tamura, N. Tatsumi, D. Tobimatsu, K. Tsuboyama, T. Unno, Y. Watanabe, T. Watase, Y. Yabuki, F. Yamada, Y. Yamagata, T. Yonezawa, Y. Yoshida, H. Yusa, K. KEK National Laboratory for High Energy Physics Tsukuba 305 Oho 1-1 Japan Department of Physics Tohoku University Sendai 980 Aza-Aoba Aramaki Aoba-ku Japan Institute of Applied Physics University of Tsukuba Tsukuba 305 Tennoudai 1-1-1 Japan Department of Physics Tokyo Metropolitan University Hachioji 192-03 Minami-Ohsawa 1-1 Japan Yasuda Women's Junior College Hiroshima 731-01 Yasuhigashi 6-13-1 Asa-Minami-ku Japan Faculty of Economics Toyama University Toyama 930 3190 Gofuku Japan Department of Physics Osaka University Toyonaka 560 Machikaneyama 1-1 Japan Department of Physics Kyoto University Kyoto 606 Oiwake-cho Kita-Shirakawa Sakyo-ku Japan Department of Applied Physics Tohoku-Gakuin University Tagajo 985 Chuo 1-13-1 Japan School of Applied Medical Science Kobe University Kobe 654-01 Tomogaoka 7-10-2 Suma-ku Japan Department of Physics Hiroshima University Higashi-Hiroshima 724 Kagamiyama 1-3-1 Japan Research Institute for High Energy Physics Helsinki University Helsinki SF-00170 Siltavuorenpenger 20C Finland Department of Physics Okayama University Okayama 700 Tsushimanaka 3-1-1 Japan Division of Natural Sciences International Christian University Mitaka 181 Ohsawa 3-10-2 Japan Faculty of Engineering Miyazaki University Miyazaki 889-01 Gakuen-Kibanadai-Nishi 1-1 Japan Institute of Physics University of Tsukuba Tsukuba 305 Tennoudai 1-1-1 Japan Hiroshima National College of Maritime Technology Hiroshima-ken 725-02 Higashino-cho 4272-1 Japan Faculty of Cross-Cultural Studies Kobe University Kobe 657 Tsurukabuto 1-2-1 Nada-ku Japan Department of Electronic and Computer Engineering Ibaraki College of Technology Hitachinaka 312 Nakane Japan Center for Information Science Kogakuin University Tokyo 163-91 Nishi-Shinjuku 1-24-2 Shinjuku-ku Japan Department of Physics Kogakuin University Tokyo 192 Nakano-cho 2665-1 Hachioji Japan Tsukuba College of Technology Tsukuba 305 Kasuga 4-1 Japan Naruto Universi

Inclusive baryon-antibaryon pair production was studied in two-photon events which were collected at the e + e - collider TRISTAN, and correspond to an integrated luminosity of 303 pb-1. Correlations between a baryon ...

Inclusive baryon-antibaryon pair production was studied in two-photon events which were collected at the e⁺ e^- collider TRISTAN, and correspond to an integrated luminosity of 303 pb^-1. Correlations between a baryon and an antibaryon were studied for their flavors (p or Λ) and their momentum vectors. The experimental results were compared with the expectations from a jet-fragmentation Monte Carlo simulation. We have found that although the ratios of the cross sections of different baryon-flavor combinations are consistent with the Monte Carlo expectations, the cross section shows an excess over the Monte Carlo expectation in a low invariant-mass region of final-state particles at large angles, that indicates a significant contribution from higher-order QCD or non-perturbative effects. The experimental data show no narrow azimuthal-angle correlation, which is expected from a jet-fragmentation Monte Carlo. A search for exclusive Λ pair production has also been made. We have no candidates and have obtained the upper limit for the cross section. © 1996 Springer-Verlag.

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On-line improved inverter waveform by variable step delta modulation

On-line improved inverter waveform by variable step delta mo...

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Annual IEEE Conference on Power electronics Specialists (PESC)

作者： A.H. Chowdhury A. Mansoor M.A. Choudhury M.A. Rahman Department of Elec. & Computer Engineering University of Texas Austin Austin TX USA Department of Elec. & Electronic Engineering Bangladesh University of Engineering and Technology Dhaka Bangladesh Faculty of Engineering & Applied Science Memorial University of Newfoundland Saint John'S NEW Canada

This paper presents a new technique using delta modulation for inverter operation. Delta modulation (DM) schemes have the ability to optimize pulse width modulated (PWM) inverter waveforms online. The tuned and the multi-integrator DM are the two schemes proposed for PWM waveform synthesis so far. The methods were found useful for variable speed PWM inverter-fed AC drives. However it was observed that during tuning and filtering process, fundamental output voltage of the inverters reduced. With an aim to overcome this effect, a new technique called the variable step rectangular wave delta modulation (RWDM) is proposed. The method has the capability to maintain a near constant fundamental voltage of the output waveform of the inverters. Both analytical and experimental verifications are carried out for tuned and variable step RWDM.< >

关键词： Pulse width modulation inverters Delta modulation Pulse width modulation Voltage Pulse inverters Filtering

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On cooperative manipulation of dynamic object

On cooperative manipulation of dynamic object

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IEEE International Workshop on Intelligent Robots and Systems (IROS)

作者： Zhi-Wei Luo Y. Uematsu K. Ito A. Kato M. Ito Bio-Mimetic Control Research Center RIKEN Institute of Physical and Chemical Research Nagoya Japan Department of Information and Computer Sciences Toyohashi University of Technology Toyohashi Japan Department of Electronic Engineering Aichi Institute of Technology Toyota Japan Department of Electric Engineering Faculty of Engineering Chubu University Matsumoto Japan

Studies multiple-robot manipulator cooperative manipulation of an unknown dynamic object. The authors show a simple approach for each robot to identify the object dynamics through cooperation. The authors decentralize the position/internal force hybrid controller such that each robot has its controller and determines its control torque from its own feedback information. Experiments show the effectiveness of the control strategy.< >

关键词： Manipulator dynamics Force control Robot kinematics Force feedback Chemical technology Torque control Robot control Motion planning Trajectory Intelligent robots

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FLAT DIVERSITY ANTENNA AT 900MHZ FOR MOBILE TELEPHONE 42

FLAT DIVERSITY ANTENNA AT 900MHZ FOR MOBILE TELEPHONE

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42ND CONF OF THE VEHICULAR technology SOC - FRONTIERS OF technology : FROM PIONEERS TO THE 21ST CENTURY

作者： ARAI, H GOTO, N Division of Electrical and Computer Engineering Faculty of Engineering Yokohama National University Hodogaya-ku Yokohama-shi Kanagawa-ken 240 Japan Department of Electric and Electronic Engineering Faculty of Engineering Tokyo Institute of Technology Ohokayama Megu'ro-ku Tokyo 152 Japan

ISBN: (纸本)0780306732

A flat diversity antenna is proposed for mobile telephone using a disk loaded monopole antenna and notch antenna arrays. The notch array designed as a turnstile antenna for receiving the magnetic field components is replaced by the disk of the disk loaded monopole antenna. Since the electric field components are received by the disk loaded monopole antenna, this combination provides an energy density reception. A prototype of the flat diversity antenna is demonstrated, and the measured results of the input impedance characteristics and the radiation patterns are also presented. © 1992 IEEE.

关键词： Monopole antennas

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A flat diversity antenna by disk loaded monopole and notch array

A flat diversity antenna by disk loaded monopole and notch a...

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1992 Joint Symposia Digest: IEEE Antennas and Propagation Society International Symposium, AP-S 1992

作者： Arai, Hiroyuki Hosono, Seiji Goto, Naohisa Division of Electrical and Computer Engineering Faculty of Engineering Yokohama National University Yokohama-shi Kanagawa-ken240 Japan Department of Electric and Electronic Engineering Faculty of Engineering Tokyo Institute of Technology Ohokayama Meguro-ku Tokyo152 Japan

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Flat diversity antenna at 900 MHz for mobile telephone

Flat diversity antenna at 900 MHz for mobile telephone

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IEEE Conference on Vehicular technology (VTC)

作者： K. Arai N. Goto Division of Electrical and Computer Engineering Faculty of Engineering Yokohama National University Yokohama Kanagawa Japan Department of Electric and Electronic Engineering Faculty of Engineering Tokyo Institute of Technology Tokyo Japan

A flat diversity antenna is proposed for mobile telephone using a disk-loaded monopole antenna and notch antenna arrays. The notch array designed as a turnstile antenna for receiving the magnetic field components is replaced by the disk of the disk-loaded monopole antenna. Since the electric field components are received by the disk loaded monopole antenna, this combination provides an energy density reception. A prototype of the flat diversity antenna is demonstrated, and the measured results of the input impedance characteristics and the radiation patterns are presented.< >

关键词： Mobile antennas Telephony Receiving antennas Antenna accessories Antenna arrays Magnetic field measurement Loaded antennas Prototypes Antenna measurements Impedance measurement

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A flat diversity antenna by disk loaded monopole and notch array

A flat diversity antenna by disk loaded monopole and notch a...

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Antennas and Propagation Society International Symposium

作者： H. Arai S. Hosono N. Goto Faculty of Engineering Division of Electrical and Computer Engineering Yokohama National University Yokohama Kanagawa Japan Department of Electric and Electronic Engineering Faculty of Engineering Tokyo Institute of Technology Meguro Tokyo Japan

The authors present a novel flat antenna consisting of a disk loaded monopole and a notch array for mobile telephone. To obtain a small correlation coefficient between the notch array and the disk loaded monopole antenna, two feed circuits are proposed for the notch array. The correlation coefficient between ring patch and notch antenna of less than 0.1 is small enough for diversity branches.< >

关键词： Loaded antennas Antenna arrays Antennas and propagation Antenna feeds Slot antennas Mobile antennas Circuits Mutual coupling Antenna radiation patterns Magnetic field measurement

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A transcutaneous energy transmission system for an artificial organ by using a novel resonant converter

A transcutaneous energy transmission system for an artificia...

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IEEE International Conference on Systems engineering

作者： T. Inoue T.H. Nishimura M. Saito M. Nakaoka Department of Computer and Control Engineering Oita High Institute of Technology Japan Department of Electric and Electronic Engineering Faculty of Engineering Oita University Japan Institute of Medical Electronics Faculty of Medicine University of Tokyo Japan Department of Electric and Electronic Engineering Faculty of Engineering Kobe University Japan

A zero voltage switched resonant converter has been designed and built as a transcutaneous energy transmission system to transfer 30 W across a variable air gap of 5-20 mm. The converter could power a total implantable artificial heart through intact skin by utilizing a transformer. In the converter, the large leakage inductances of the transcutaneous transformer have been incorporated in the resonant inductor. The steady-state operation of an experimental transcutaneous power supply has been accurately predicted by the theoretical analysis.< >

关键词： Artificial biological organs Resonance Switching converters Zero voltage switching Frequency DC-DC power converters Artificial heart Coupling circuits Power supplies Stationary state

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Classification of Gas-Liquid Two-Phase Flow Regime by an Ar-Model

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IFAC Proceedings Volumes 1992年第15期25卷 597-602页

作者： K. Inoue G.N. Rao A. Mizutori Y. Morita K. Sekoguchi Department of Control Systems Engineering Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Iizuka Fukuoka 820 Japan Department of Electronic Engineering Oita University Dannoharu Oita 870-11 Japan Department of Mechanical Engineering Osaka University Yamada-oka Suita Osaka 565 Japan

The discrimination of gas-liquid two-phase flow patterns has so far been made mainly by visual observation; and various flow parameters characterizing the flow, such as fluctuating pressures, void fraction etc., have been employed as quantitative tools for this purpose. It would be useful for the prediction and prevention of accidents experienced in thermal engineering plants dealing with the flow if it could be found the effective techniques for analyzing void fraction signals detected for diagnosing plant operation states. This paper presents pattern recognition and clustering techniques for analyzing the cross-sectional mean void fraction signals in gas-liquid two-phase flow based on an AR-model with bias components. The pattern recognition method based on the Bayes decision rule was applied for the recognition of flow regimes which were determined by visual observations. The clustering methods based on K-mean algorithm and mixture probability algorithm were applied for the determination of the new boundaries on a superficial gas-liquid velocities diagram. The effectiveness of the discussed techniques were confirmed.

关键词： pattern recognition clustering Bayes methods AR-model parameter estimation thermal plants multiphase flow void fraction

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