Conductivity measuring apparatus and method

G - Physics – 01 – N

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G01N 27/06 (2006.01) G01R 17/06 (2006.01) G01R 27/22 (2006.01) G01N 33/18 (2006.01)

Patent

CA 2267281

An improved apparatus for measuring conductivity or resistivity compensates for series capacitance (Cs) and parallel capacitance (Cp). A sine-wave potential excitation (14) is applied to a reference resistance (12) and a conductivity cell (10) connected in series. The voltages across the resistance (12) and the cell (10) are sampled. To compensate for series capacitance, both sampled voltages are synchronously rectified with respect to the phase of the sampled resistance voltage. To compensate for parallel capacitance, both sampled voltages are synchronously rectified with respect to the phase of the sampled cell voltage. The rectified voltages are integrated and the cell conductivity or resistivity is calculated from the ratio of the integrated voltages.

Dispositif amélioré servant à mesurer la conductivité ou la résistivité afin de corriger des capacités en série (Cs) ou en parallèle (Cp). On applique une excitation de potentiel d'onde sinusoïdale (14) à une résistance de référence (12) et à une cellule de conductivité (10) branchées en série. On échantillonne les tensions à la résistance (12) et à la cellule (10). On redresse de façon synchrone les deux tensions échantillonnées, dans le but de corriger la capacité en série, par rapport à la phase de la tension de résistance échantillonnée. On redresse de façon synchrone les deux tensions échantillonnées, dans le but de corriger la capacité en parallèle, par rapport à la phase de la tension de cellule échantillonnée. On intègre les tensions redressées et on calcule la conductivité ou la résistivité de la cellule à partir du rapport des tensions intégrées.

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