Screened capacitive sensor

Details Screened capacitive sensor Screened capacitive sensor

G - Physics

01

R

G01R 27/26 (2006.01) G01D 5/24 (2006.01) G01D 5/241 (2006.01) G01L 9/12 (2006.01)

Patent

CA 2169823

A pressure sensor measures pressure by measuring capacitance between two capacitive plates. Pressure change appears as a change in capacitance. Stray capacitance interferes with this measurement. The stray capacitance arises between the capacitor plates and surrounding material Circuitry reduces stray capacitance by maintaining substantially no potential difference between a capacitor plate and surrounding material responsible for stray capacitance.

Un capteur de pression (10) mesure la pression en déterminant la capacitance entre deux plaques capacitives (114, 116). Une variation de pression se traduit par une modification de la capacitance. Une capacitance parasite interfère avec cette mesure. La capacitance parasite prend naissance entre les plaques capacitives (114, 116) et un matériau environnant. Un circuit (140) réduit la capacitance parasite en ne maintenant pratiquement aucune différence de potentiel entre une plaque capacitive (114, 116) et un matériau environnant responsable de la capacitance parasite.

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