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Compact underwater electromagnetic measurement system using magnetic sensors and electrical sensors having capacitive electrodes

  • US 10,082,546 B2
  • Filed: 12/11/2007
  • Issued: 09/25/2018
  • Est. Priority Date: 12/11/2006
  • Status: Active Grant
First Claim
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1. A system for measuring magnetic and electric fields present in an electrically conducting medium, the system comprising:

  • a group of components constituting an integrated sensor package including;

    two magnetic sensors, each magnetic sensor having a magnetic field induction coil for producing a magnetic field signal and a magnetic field signal amplifier connected to the induction coil for producing an amplified magnetic field signal based on the magnetic field signal, each induction coil being disposed so as to measure fields in orthogonal directions;

    two electric field sensors, each electric field sensor having an electric field signal amplifier connected to at least two electric potential antennas for producing an amplified electric field signal, each electric field sensor being disposed so as to measure fields in orthogonal directions, the at least two electric potential antennas each including a respective capacitive electrode being adapted to measure an electric potential and having a conducting core and an electrically insulative layer covering the core, said insulative layer preventing transfer of a resistive current from the core to the medium;

    a data acquisition system for receiving the amplified electric field signals and the amplified magnetic field signals and storing data representative thereof; and

    a power supply for providing electrical power to the data acquisition system, the electric sensors and the magnetic sensors.

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