Abstract: A three dimensional (3D) dipole antenna system with spiral leg is described used to measure oscillatory electric field strengths. The system relies on spiral dipole leg segments of limited length attached to a cylinder. It is designed to improve the sensitivity to oscillatory electric signals in the range of 0.01 Hz to 10,000 Hz. The antenna system is connected to an object (a survey platform) that is stationary or moving in an area of interest in air, over land, on water or under water. Such antenna system is generally used as part of a prospecting survey system for water, minerals or hydrocarbons.

Abstract: A three dimensional (3D) dipole antenna system with spiral leg is described used to measure oscillatory electric field strengths. The system relies on spiral dipole leg segments of limited length attached to a cylinder. It is designed to improve the sensitivity to oscillatory electric signals in the range of 0.01 Hz to 10,000 Hz. The antenna system is connected to an object (a survey platform) that is stationary or moving in an area of interest in air, over land, on water or under water. Such antenna system is generally used as part of a prospecting survey system for water, minerals or hydrocarbons.

Abstract: A one dimensional dipole based antenna system is described used to measure oscillatory electric and magnetic field strengths and the rate of change of the magnetic field strength. The system relies on paramagnetic mild steel for selected dipole system components to decrease the sensitivity to high frequency oscillatory magnetic signals progressively above a certain frequency in the range of 300 to 10,000 Hz. The physical properties of the mild steel type used determine the actual frequency response characteristics. The antenna system, which can easily be expanded to a three dimensional system, is connected to an object (a survey platform) that is stationary or moving in an area of interest in air, over land, on water or under water. Such antenna system is generally used as part of a prospecting survey system for minerals or hydrocarbons.

Abstract: A new three dimensional dipole based antenna system is described used to measure oscillatory electric field strengths. The antenna system is connected to an object (a survey platform) that is stationary or moving in an area of interest in air, over land, on water or under water. This invention aims to reduce the influence of noise sources on electric field strength measurements. Such measurements are generally collected as part of prospecting surveys for minerals or hydrocarbons.

Abstract: A survey system is described for locating and classifying geophysical anomalies. It includes a moving platform equipped with a recording unit for recording the position of the platform. The system also comprises three first measuring units or sensors, adapted to record a varying electric field strength and a varying magnetic field strength at chosen intervals and thus positions, said first measuring units being adapted to measure said field strengths in three independent and mutually orthogonal directions at frequencies in a chosen range. The system includes a calculation unit for combining the measurements from each of said first sensors and calculating and recording as well as comparing the field strength vectors of the varying measured fields at each position, to find anomalies.