Density and viscosity are important quantities which describe the physical properties of liquid, and density is the most important thermo-physical property of hybrid nanofluids.
Many methods were proposed for density measurement of density or viscosity alone. Resonant sensors can measure density and viscosity simultaneously, so it has many applications in the fields of physical or chemical sensing in liquid.
In the measurement of liquid density and viscosity, the change of resonance parameters due to the parasitic parallel capacitance of resonator affects measurement accuracy.
In order to improve accuracy, An Nam Chol, a section head at the Faculty of Electronics, proposed a method for compensating the parasitic parallel capacitance of resonator by adding an electrode. In addition, he modeled a resonant sensor with a compensation electrode and determined the structural parameters through simulations and experiments.
He conducted some experiments to examine the effect of this method. The experimental results show that this method is valuable for compensation of parasitic parallel capacitance of an immersed resonant sensor in liquid.
You can find the details in his paper “Accuracy improvement of resonant sensor by an additional electrode in the measurement of liquid density and viscosity” in “Sensor Review” (SCI).