Patent ID: 6886410

Claim:
A device for sensing pressure, comprising: a sealed chamber defining part; a first flexible diaphragm having two sides and mounted on one side in communication with the chamber in said sealed chamber defining part, said first flexible diaphragm having a conductive surface; an insulator mounted on the other side of said first flexible diaphragm; a second flexible diaphragm having two sides and mounted on one side in communication with said insulator, said second flexible diaphragm having a conductive surface; a sensor chamber defining part mounted on the other side of said second flexible diaphragm and having an opening for communication with a sensing atmosphere, whereby one of said first and second flexible diaphragms includes openings it its surface to permit fluid to flow through said openings and the other of said first and second diaphragms is solid and responds to change in pressure in said sensor chamber to move away from or toward said one of said flexible diaphragms; and electrical connections contacting said first and said second flexible diaphragms and adapted to measure the capacitance between said diaphragms as a function of the pressure in said sensor chamber introduced through said opening and causing said one flexible diaphragms to move with respect to the other of said flexible diaphragms.