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

A resonance type impedance sensor which is a multicoil open-core or air-core inductor, said sensor comprising at least two coils, one coil being an excitation coil connectable to at least one alternating current source with frequency sweep, another coil being a sensing coil connectable to at least one data processing system, wherein upon electrical connection to said current source, said excitation coil propagates an energy to said sensing coil, which generates a probing electromagnetic field, and wherein L C R parameters of said sensing coil are capable of providing resonance conditions for measuring of object under test impedance at predetermined frequency.