Continuous monitoring of conductivity using uniform magnetic field

GABRIEL A. RUIZ, CARMELO J. FELICE; JERONIMO ROJAS DIAZ

Manizales

Conferencia; 3rd Latin American Conference on Bioimpedance; 2018

A spherical coil was used to measure a broad range of conductivities of solutions of NaCl in water. The method proposed in this work relates the sample conductivity with the frequency at the minimum value of a imaginary admittance spectrum when the coil is immersed in the solution. Results correlate greatly (r = 0,95). Since the proposed method is an inductive one, the drawbacks of electrode methods are avoided, e.g. the interface polarization impedance. The presented method is fast, it does not require an estimate for the Q factor and the measurements does not depend on the sample volume when the coil is completely immersed. The system is capable of continuous monitoring of biological and inorganic samples.