何祖源博士受聘必赢电子游戏兼职教授仪式暨学术报告会

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何祖源博士受聘必赢电子游戏兼职教授仪式暨学术报告会

时间:20099 23日(周三)下午2:00

地点:行政楼208会议室
何祖源博士简介和报告摘要:

Advanced Fiber Optic Sensor Technology

 

Zuyuan He

Department of Electrical Engineering and Information Systems

The University of Tokyo

 

Abstract

Optical fiber is well known as a kind of light transmission media used in optical fiber communications.  Moreover, the properties of the lightwave propagating in the optical fiber, such as intensity, frequency, phase, polarization state, etc., can be changed by external variety.  Therefore, optical fiber has been used to develop various schemes of devices for sensing miscellaneous measurands, such as pressure, temperature, distance, position, acceleration, rotation, vibration, sound-pressure, stress, strain, electric field, electric current, magnetic field, chemical ingredient, gas concentration, radiation, and a lot.  The fiber optic sensing is particularly suitable for distributed and multiplexed applications.  It is possible in principle to determine the value of a wanted measurand continuously as a function of position along the length of a suitably configured optical fiber.  The normal temporal variation of the distribution is determined simultaneously.  Such a facility opens up an enormous number of possibilities for industrial application, which conventional measurement technology does not provide.  For example, it would allow the spatial and temporal strain distributions in large critical structures such as multistory buildings, bridges, dams, aircraft, pressure vessels, and electrical generators, and so forth to be monitored continuously.  It represents one of the most important technologies growing the new interdisciplinary field called “smart structures” and “smart materials.”

In this lecture, the basic principles and examples of typical fiber optical sensors will be reviewed in Part I to provide a landscape image of the technological field.  In particular, the optical fiber reflectometry, which is the basis of most distributed and multiplexed fiber optic sensors, are discussed in detail.  In Part II, the technique of synthesis of optical coherence function (SOCF), which is a unique technique developed in our laboratory over the past ten years, and its applications in distributed and multiplexed fiber optic sensors are introduced.

 

Outline

Part I

     Basics of fiber optic sensors:
Fiber transmission type and fiber sensing type; intensity (polarization) modulated type and phase (frequency) modulated type.

     Examples of typical fiber optic sensors:
Fiber optic hydrophone and fiber optic gyroscope; fiber Bragg grating (FBG) based sensors; optical scattering based sensors; multiplexed and distributed sensors.

     Basics and applications of optical fiber reflectometry:
Optical time domain reflectometry (OTDR); optical frequency domain reflectometry (OFDR); and optical coherence domain reflectometry (OCDR).

Part II

     Synthesis of optical coherence function (SOCF):
Controlling the optical correlation.

     Optical reflectometry by SOCF:
High spatial-resolution reflectometry for optical devices; long-range and high speed reflectometry for diagnosis of FTTH networks; high reflectance-resolution reflectometry for fiber assembly modules; coherence tomography and optical information processing.

     Fiber optic sensors by SOCF:
Stress location sensors; FBG-based sensors; dynamic grating-based sensors

     Brillouin scattering based distributed sensors:
Brillouin optical coherence domain analysis (BOCDA); Brillouin optical coherence domain reflectometry (BOCDR); discrimination of strain and temperature.

 

 

Zuyuan He, Ph.D.

Associate Professor, Optical Information Devices and Systems
Department of Electrical Engineering and Information Systems
Graduate School of Engineering
The University of Tokyo

7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

Phone: +81-3-5841-6746, Fax: +81-3-5841-8563, Email: ka@sagnac.t.u-tokyo.ac.jp

 

 

Personal Profile


Dr. He received the B.S. and M.S. degrees in electronic engineering from Shanghai Jiao Tong University, Shanghai, China, in 1984 and 1987, respectively, and Ph.D. degree in optoelectronics from the University of Tokyo, Tokyo, Japan, in 1999.

He joined Nanjing University of Science and Technology, Nanjing, China as a Research Associate in 1987, and became a Lecturer in 1990, where he was engaged in research of fiber optic sensors, evaluation and measurement of optical devices, and optical instrumentation. From 1995 to 1996, he was a Visiting Research Fellow studying on optical information processing in the Research Center for Advanced Science and Technology, The University of Tokyo. In 1999, he became a Research Associate of the University of Tokyo, where he worked on measurement and characterization of fiber optic components and systems, fiber optic reflectometry, fiber optic sensors, and multi-dimensional optical information processing. In 2001, he joined CIENA Corporation, Linthicum, Maryland, USA, as a Lead Engineer heading the optical test and optical process development group. He returned to the University of Tokyo as a Lecturer in 2003, and became an Associate Professor in 2005. His current research interests include optical fiber sensors, optical fiber measurement, and optical information processing.

 

Major Research Field

Dr. He's major research interests are in the area of photonic measurement, sensing, and computing for information acquisition and processing. Based upon photonics, various novel fiber optic sensing, fiber optic measurement and optical information processing techniques are challenged.

His current research themes are as follows;

l     Distributed and multiplexed fiber optic sensors

l     Fiber optic measurement and optical fiber communication

l     Optical information processing and biomedical photonics

 

Academic Memberships

Institute of Electronics, Information and Communication Engineers (IEICE), Optical Society of America (OSA), Institute of Electrical and Electronic Engineers (IEEE)



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