A sensor comprising: a three-dimensional resonant transducer configured to determine a composition of an emulsion or other dispersion, wherein the three-dimensional resonant transducer comprises: - a sampling cell; - a top winding and a bottom winding, the bottom winding being located around the sampling cell and the top winding being located around and concentric to the bottom winding; - a galvanic isolator provided between the top winding and the bottom winding; - a radio-frequency absorber layer disposed around the top winding; - a spacer disposed between the top winding and the RF absorber layer; the spacer being made of galvanic isolating material; - wires connecting the ends of the top winding to a connecter, said connecter being adapted to connect an electrical cable from an impedance analyzer to the three-dimensional resonant transducer; - fittings at the ends of the sampling cell; wherein: the top winding is adapted to act as both a drive coil and a pick up coil; the bottom winding is adapted to act as a resonator or sensing coil, the bottom winding is a floating winding, with no galvanic connections to other parts of the three-dimensional resonant transducer; the bottom winding is adapted to be excited by an electro-magnetic field created by a power wave flowing through the top winding such that the excited bottom winding generates another electro-magnetic field that is altered by its interaction with the fluid in the sampling cell, said altered electro-magnetic field being then sensed by the top winding. a three-dimensional resonant transducer configured to determine a composition of an emulsion or other dispersion, wherein the three-dimensional resonant transducer comprises: - a sampling cell; - a top winding and a bottom winding, the bottom winding being located around the sampling cell and the top winding being located around and concentric to the bottom winding; - a galvanic isolator provided between the top winding and the bottom winding; - a radio-frequency absorber layer disposed around the top winding; - a spacer disposed between the top winding and the RF absorber layer; the spacer being made of galvanic isolating material; - wires connecting the ends of the top winding to a connecter, said connecter being adapted to connect an electrical cable from an impedance analyzer to the three-dimensional resonant transducer; - fittings at the ends of the sampling cell; - a sampling cell; - a top winding and a bottom winding, the bottom winding being located around the sampling cell and the top winding being located around and concentric to the bottom winding; - a galvanic isolator provided between the top winding and the bottom winding; - a radio-frequency absorber layer disposed around the top winding; - a spacer disposed between the top winding and the RF absorber layer; the spacer being made of galvanic isolating material; - wires connecting the ends of the top winding to a connecter, said connecter being adapted to connect an electrical cable from an impedance analyzer to the three-dimensional resonant transducer; - fittings at the ends of the sampling cell; wherein: the top winding is adapted to act as both a drive coil and a pick up coil; the bottom winding is adapted to act as a resonator or sensing coil, the bottom winding is a floating winding, with no galvanic connections to other parts of the three-dimensional resonant transducer; the bottom winding is adapted to be excited by an electro-magnetic field created by a power wave flowing through the top winding such that the excited bottom winding generates another electro-magnetic field that is altered by its interaction with the fluid in the sampling cell, said altered electro-magnetic field being then sensed by the top winding. the top winding is adapted to act as both a drive coil and a pick up coil; the bottom winding is adapted to act as a resonator or sensing coil, the bottom winding is a floating winding, with no galvanic connections to other parts of the three-dimensional resonant transducer; the bottom winding is adapted to be excited by an electro-magnetic field created by a power wave flowing through the top winding such that the excited bottom winding generates another electro-magnetic field that is altered by its interaction with the fluid in the sampling cell, said altered electro-magnetic field being then sensed by the top winding.