Cell for converting differential pressure into an electric...

G - Physics – 01 – L

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Details

G01L 9/00 (2006.01) G01L 13/06 (2006.01) G01L 19/06 (2006.01)

Patent

CA 2268351

The invention concerns a cell (28) for converting differential pressure into an electric signal comprising: two chambers (38, 40) filled with an incompressible fluid each delimited by a membrane (32, 34) capable of being deformed by the action of external pressure and separated from each other by a rigid wall (36; 52; 56); a sensor (42) associated with said wall, sensitive to the difference of pressure exerted on either side of the wall, and delivering in response an electric signal. The invention is characterised in that at least one passage (50; 54; 58) is provided between the two chambers (38, 40) and having dimensions adapted for at least attenuating a spurious pressure difference occurring on either side of the wall (36; 52; 56) with a low or even no frequency, and for enabling said sensor to detect the pressure difference exerted on either side of the wall with higher frequencies.

L'invention est relative à une cellule (28) de conversion d'une pression différentielle en signal électrique comprenant: deux chambres (38, 40) remplies d'un fluide incompressible, délimitées chacune par une membrane (32, 34) susceptible de se déformer sous l'action d'une pression extérieure et séparées l'une de l'autre par une paroi rigide (36; 52; 56); un capteur (42) associé à ladite paroi, sensible à la différence de pression exercée de part et d'autre de la paroi, et délivrant en réponse un signal électrique, caractérisé en ce qu'au moins un passage (50; 54; 58) est pratiqué entre les deux chambres (38, 40) et possède des dimensions adaptées pour, d'une part, au moins atténuer une différence de pression parasite s'établissant de part et d'autre de la paroi (36; 52; 56) avec une fréquence faible voire nulle et, d'autre part, laisser ledit capteur détecter la différence de pression exercée de part et d'autre de la paroi aux fréquences plus élevées.

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