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Impedance sensing systems and methods for use in measuring constituents in solid and fluid objects

  • US 8,547,110 B2
  • Filed: 09/22/2010
  • Issued: 10/01/2013
  • Est. Priority Date: 09/22/2009
  • Status: Active Grant
First Claim
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1. A resonance type impedance sensor which is a multicoil open-core or air-core inductor, said sensor comprising at least two coils, at least one coil of the at least two coils being at least one excitation coil connectable to at least one alternating current source with frequency sweep, at least one other coil of the at least two coils being at least one sensing coil connectable to at least one data processing system and/or data acquisition unit (“

  • DAQ”

    ), wherein;

    (i) upon electrical connection to said current source, said at least one excitation coil is capable of propagating an energy to said at least one sensing coil, which is capable of generating a probing electromagnetic field, (ii) said at least one sensing coil is designed in such a way that intrinsic inductance L, capacitance C, and resistance R parameters of said at least one sensing coil are capable of providing resonance conditions for measuring of object under test impedance at a predetermined frequency or at a predetermined frequency range; and

    (iii) said at least one sensing coil uses only its intrinsic (distributed) capacitance and is not connected to any capacitance means such that said at least one sensing coil is capable of measuring at least one of conductance, conductivity and one or more dielectric properties of at least a part of said object under test being disposed within a sensing area of said at least one sensing coil.

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