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精研談話会が開催されました．（2004年6月4日）

平成16年6月4日（金）午後15時より、下記の内容で精研談話会が開催されました．　（文責：James,R Friend）

精研談話会: 電磁界の赤外線映像 (コロラド大学のノルガード先生）

署名： Infrared Images of Electromagnetic Fields（電磁界の赤外線映像）

講演者： John Norgard, Professor

Electromagnetics Laboratory
Department of Electrical &Computer Engineering
College of Engineering & Applied Science University of Colorado USA

Abstract：
An infrared (IR) measurement technique is presented that has been developed to measure electromagnetic (EM) fields. This technique uses a minimally perturbing, thin, planar IR detection screen to produce a thermal image (e.g., an IR thermogram) of the intensity of the EM energy over the two-dimensional region of the screen. Several examples are presented using this thermal technique to measure EM fields. These examples include:

1,radiation from microwave sources
2,scattering from conducting bodies
3,coupling through apertures in shielded enclosures

This technique has been used to experimentally validate complicated numerical codes that predict electric field distributions in areas where conventional hard-wired probes would significantly perturb the fields being measured, for example inside waveguides and cavities　nd near apertures. Surface current distributions (H-Fields) on metallic surfaces also can be measured with this technique.

Mini-Biography：
John Norgard, IEEE Fellow (1990), associate editor of IEEE Transactions on EMC, and on the Board of Physics and Astronomy for the National Research Council and the National Academy of Sciences, received the Bachelor's degree from Georgia Tech in 1966 and the M.S. and Ph.D. degrees from the California Institute of Technology in 1967 and 1969, respectively. His Ph.D. thesis was on the design of communication antennas for the Viking Mars landers. From 1967 to 1969 he was an Associate Engineer with NASA's Jet Propulsion Laboratory. In 1970, he was a Post-Doctoral Fellow at the University of Oslo, Norway and worked for the Norwegian Defense Research Institute and the Auroral Observatory. From 1970 to 1985, he taught at Georgia Tech and consulted for Bell Telephone Laboratories. He is now a Professor at the University of Colorado at Colorado Springs. His areas of interest are applied electromagnetic theory, multipair transmission lines, and infrared thermography.

Prof. Norgard describing his measurement techniques using thin-film carbon: standing waves between two antenna horns.

Prof. Norgard's audience.

An F-16 scaled fuselage prepared for electromagnetic field measurements.

The electromagnetic field distribution about an F-16 fuselage due to EM radiation from the front.