New contactless inductive sensor for the measurement of concentration of an electrolytic solution

In this paper an inductive sensor with a new and simple contactless structure to determine the concentration of an electrolytic solution is presented. The authors propose a novel idea ol designing the sensing coil of the sensor so that the magnetic field is focused inside the conducting liquid, thereby increasing the sensitivity of the sensing coil. By detecting the change in inductance of the sensing coil due to a solution of known concentrations of a particular electrolyte, a database is created, With the help of this database it is possible to estimate the unknown concentration of an electrolytic solution, It was tested for various concentrations of NaCl and it shows a distinct response for each concentration.