Patent ID: 6443015
Filing Date: 2002-09-03
Classification: G01L

Abstract:
A capacitive pressure sensor comprising:a housing having an inlet for receiving a fluid, the inlet being characterized by a first diameter; a flexible diaphragm mounted within the housing, the diaphragm flexing in response to pressure from the fluid the diaphragm lying substantially in a plane when the pressure from the fluid equals a particular value; a first baffle member disposed within the housing between the inlet and the diaphragm, the first baffle member being substantially parallel to the plane, the first baffle member having a closed central portion and peripheral openings for allowing particles smaller than the openings to pass through, the closed central portion being characterized by a second diameter that is greater than the first diameter; a second baffle member disposed parallel to the plane within the housing between the diaphragm and the first baffle member, the second baffle member being characterized by a third diameter greater than the second diameter, a periphery of the second baffle member being spaced from the housing to allow fluid to pass in a direction perpendicular to the plane.