Electric potential sensor

G - Physics – 01 – R

Patent

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Details

G01R 29/12 (2006.01) G01R 19/00 (2006.01)

Patent

CA 2646411

The present invention provides an electric potential sensor (28) for the measurement of potentials non-invasively. The sensor comprises at least one detection electrode (12) arranged for capacitive coupling with a sample under test and for generating a measurement signal, and a sensor amplifier (14) adapted to receive the measurement signal as input and to supply an amplified detection signal as output. Input impedance enhancing means (12a, 32, 36, 38, 44) are included for providing a high input impedance to the sensor amplifier for increasing the sensitivity of the electrode to reduced electric potentials, and a discrete pre-amplifier stage (30) is arranged to co-operate with the sensor amplifier to reduce the input capacitance of the amplifier.

L'invention concerne un capteur de potentiel électrique (28) permettant de mesurer des potentiels de manière non invasive. Ce capteur comprend au moins une électrode de détection (12) placée pour un couplage capacitif avec un échantillon à tester et conçue pour générer un signal de mesure, et un amplificateur de capteur (14) conçu pour recevoir le signal de mesure en entrée et fournir en sortie un signal de détection amplifié. Des moyens d'augmentation d'impédance d'entrée (12a, 32, 36, 38, 44) sont destinés à fournir une impédance d'entrée élevée à l'amplificateur de capteur, de sorte à accroître la sensibilité de l'électrode aux potentiels électriques réduits. Un étage de préamplificateur discret (30) est conçu pour coopérer avec l'amplificateur de capteur afin de réduire la capacité d'entrée de ce dernier.

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