| 摘要 |
PCT No. PCT/HU83/00037 Sec. 371 Date Mar. 9, 1984 Sec. 102(e) Date Mar. 9, 1984 PCT Filed Jul. 7, 1983 PCT Pub. No. WO84/00423 PCT Pub. Date Feb. 2, 1984.Method and apparatus for determining the horizontal position and depth of a buried metallic conductor. An upper and a lower ferrite antenna, at least one rotatable in the vertical plane, and each coupled to a band-pass filter, detect the horizontal and vertical components of an electromagnetic field associated with the buried conductor. The electromagnetic field may be induced in the conductor by a portable generator, or alternatively, by alternating current already present in the conductor. The horizontal position of the conductor is determined by measuring the vertical component of the electromagnetic field at an upper or lower level and the horizontal component of the electromagnetic field at a lower or upper level. On the basis of the ratio of the two components the approximate horizontal position of the conductor is determined. The depth of the conductor is determined by measuring the horizontal component of the electromagnetic field at both the upper and the lower level. Circuit elements in the apparatus convert the voltages induced in the antennas into suitable indications of the horizontal position and depth of the buried conductor. |
