Poster

[GP-P-01] Measurement of wave polarization scattered by a cylindrical conductor with a dipole and loop array borehole radar

*Satoshi Ebihara¹, Koki Koyama¹, Hisaya Yamamoto¹, Yuki Tsujikawa¹, Tomoya Kako¹ (1. Osaka Electro-Communication Univ. (Japan))

We present a borehole radar system that can radiate and receive horizontally and vertically polarized waves. This capability can help the characterization of a radar target. In this study we designed the radar with two loops and four dipole antennas for both a transmitter and a receiver. The two kinds of antennas can radiate or receive two perpendicular polarizations of waves independently. We made a prototype of the radar system and conducted field experiments in wet soil. The radar was in a vertical borehole, while the radar target was a vertical or inclined conducting cylinder underground. Both the targets are one meter apart from the borehole. We defined the antenna voltage ratio as the loop antenna signal voltage divided by the dipole one. We found that the amplitude ratio in the inclined cylinder’s case is twenty times larger than that of the vertical one when the vertical dipole is a transmitter. This result may lead to improved characterization of the radar target.