A novel directional borehole radar system using optical electric field sensors

Motoyuki Sato, Takuya Takayama

研究成果: Article査読

52 被引用数 (Scopus)

抄録

A directional borehole radar system using an array antenna connected to passive optical electric field sensors was developed and evaluated by laboratory and field experiments. This system uses a single dipole antenna for a transmitter and a four-dipole element circular array for a receiver. The received signals are transmitted through optical fibers from optical electric field sensors. The receiver array measures the phase differences between four dipole antennas and estimates the azimuth direction of the incoming reflection wave. The accuracy of the phase measurement was first evaluated in a laboratory test and then tested in a field experiment. To compensate for the sensitivity differences among the sensors, we propose an in situ calibration technique. The dominant operating frequency of the system is 70 MHz. Subsequently, we used borehole radar for subsurface measurements in a vertical borehole in granite. Estimation of the azimuth orientations of subsurface fractures was successfully demonstrated.

本文言語English
ページ(範囲)2529-2535
ページ数7
ジャーナルIEEE Transactions on Geoscience and Remote Sensing
45
8
DOI
出版ステータスPublished - 2007 8月

ASJC Scopus subject areas

  • 電子工学および電気工学
  • 地球惑星科学(全般)

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