METHOD OF DETERMINING METAL ELECTRODE-BIOLOGICAL FLUID BOUNDARY SURFACE IMPEDANCE Russian patent published in 2011 - IPC G01N27/07 

FIELD: physics.

SUBSTANCE: method is realised by using a rectangular measurement chamber filled with biological fluid. Two identical electrodes are mounted on faces of the measurement chamber: the electrode under analysis and a second electrode for generating current. There is a third electrode in the middle of the chamber which can be moved by a certain distance along the chamber using a standard substage. Current of a given intensity and frequency is generated through outermost electrodes in the measurement chamber using a sinusoidal oscillator, for example GZ-122. Potential drop between the analysed and mobile electrodes is measured using a VZ-33 millivoltmetre. The millivoltmetre picks up the sum of potential drops on the analysed electrode-biological fluid boundary impedance and on the biological fluid impedance on the area between the analysed electrode and the mobile electrode. By moving the mobile electrode along the measurement chamber from the analysed electrode to the electrode for generating current in the circuit, 5-6 measurements are taken through equal distances, where in the outermost positions, the mobile electrode must not touch the fixed electrodes. Measurement results are presented in form of a curve U=f(L). Approximation of this relationship before intersection with the voltage axis enables to determine potential drop on the polarised area of the analysed electrode. In that case, the analysed electrode-biological fluid boundary surface impedance can be calculated using Ohm's law.

EFFECT: invention enables highly accurate determination of the metal electrode-biological fluid boundary surface specific impedance.

3 tbl, 3 ex, 6 dwg