3-D Estimation of Horizontal Conducting Cylinder by Loop Array Antenna in a Vertical Borehole

A horizontal loop array antenna (HLA) in a vertical borehole is utilized to estimate the 3-D position of a horizontal conducting cylinder. According to the computer simulation, the horizontal loop antenna can detect reflected waves from a thin conducting cylinder with a diameter of 1 cm in the soil. However, a vertical dipole antenna hardly does. Another computer simulation demonstrated that the singlehole borehole radar probe with the HLA could detect a reflected wave from a horizontal conducting cylinder just after a direct wave in the time domain and estimate the 3-D positions of the reflection point on the cylinder. The prototype borehole radar with the HLA was applied to estimate the 3-D positions of the horizontal cylinder. This radar measured a conducting cylinder in wet soil and estimated the 3-D reflection points on the conducting cylinder.