Low Concentration Sodium Chloride Salinity Detection System

An AC Andersons bridge coupled with a low matching impedance solenoid coil is employed to detect and measure low concentration of sodium chloride aqueous solutions (ppm) is designed and constructed. The sensory system is independent of the excited driving frequency. The finite element method simulation of the sensor element is simulated and modeled with approximately 1.23 million 3D tetrahedron meshes with CST EM studio. The constructed induction sensor is sensitive and able to observe Millipore Milli-Q low resistivity (18.2 MOhm*cm) ultrapure water and various concentration of lab prepared sodium chloride solutions. The observed sodium chloride system sensitivity is -1.5228 × 10^sup -4^ ln NaCl(ppm)} with high correlation constant of R = 0.9835. [PUBLICATION ABSTRACT]