Japan Geoscience Union Meeting 2015

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International Session (Oral)

Symbol S (Solid Earth Sciences) » S-TT Technology & Techniques

[S-TT13] Recent Advances in Exploration Geophysics (RAEG2015)

Thu. May 28, 2015 11:00 AM - 12:45 PM 102A (1F)

Convener:*Hitoshi Mikada(Kyoto University), Junichi Takekawa(Graduate School of Science, Kyoto University), Junzo Kasahara(University of Shizuoka, Faculty of Earth Scieces), Yoshihisa Iio(Disater Prevention Research Institute, Kyoto University), Yasuo Ogawa(Volcanic Fluid Research Center Tokyo Institute of Technology), Nobukazu Seama(Department of Earth and Planetary Sciences, Graduate School of Science, Kobe University), Tatsuya Sato(Geothermal Energy Research & Development Co., LTD.), Eiichi Asakawa(JGI, Incorporated), Chair:Toshinori Kimura(Japan Agency for Marine-Earth Science and Technology), Kyosuke Okamoto(Railway Technical Research Institute)

11:30 AM - 11:45 AM

[STT13-09] Applicability of Phased Array Antenna to Ground Penetrating Radar

*Kaito KIKUCHI1, Hitoshi MIKADA1, Tada-nori GOTO1, Junichi TAKEKAWA1 (1.Graduate School of Engineering, Kyoto University)

Ground Penetrating Radar (GPR) has been widely used to detect objects in shallow subsurface. A bow-tie antenna, which is one of the major antennas, provides the clear cross sections in the shallow subsurface, especially under the survey line. On the other hand, the resolution across the survey lines depends on its interval. To overcome this problem, we tried to apply a phased array system to GPR. We conducted numerical simulations using a three-dimensional model composed of water, dry sand and some small perfect conductors with cubic shape. We compared two different kinds of antenna, a dipole antenna and a phased array antenna. The phased array antenna has an 8 x 8 sending unit and one receiving unit at the center of the radar. Both antennas have the length of about 0.5 meters. Our results show that the phased array antenna enhanced the noise-to-signal ratio and it also enhanced the amplitude of a scattered wave from a perfect conductor located out of the survey line. We conclude that the application of the phased array system to GPR has a potential to survey with wider angle than the conventional GPR system.