Capacitive pressure transducer
First Claim
1. A capacitive pressure transducer for measuring fluid pressure comprising:
- A. a pressure sensor formed by a cylinder having one end enclosed by a deformable metal diaphragm that serves as one plate of a capacitor whose second plate is spaced from the diaphragm by an air gap constituting the dielectric of the capacitor, deformation of the sensor diaphragm in response to pressure acting to vary the air gap to produce a corresponding change in the value of the capacitance; and
B. a coupling assembly adapted to hydraulically convey the pressure of the fluid to be measured to the pressure sensor while isolating the structure of the sensor from the fluid, said assembly including a body component having a column section and a base section, the column section being received within the cylinder with its head spaced from the sensor diaphragm to define therewith a sensor chamber which communicates through a passage in the column section with an isolation chamber formed at the bottom of the base section and sealed by a barrier diaphragm, the chambers and the passage being filled with hydraulic fluid whereby the pressure of fluid imposed on the barrier diaphragm is transferred to the sensor diaphragm.
1 Assignment
0 Petitions
Accused Products
Abstract
A capacitive pressure transducer constituted by a pressure sensor whose capacitance is caused to vary as a function of an applied pressure and a coupling assembly adapted to hydraulically convey the variable pressure of the fluid to be metered to the pressure sensor while isolating the structure of the sensor from the fluid. The sensor is formed by a cylinder, one end of which is enclosed by a deformable diaphragm that serves as one plate of a capacitor, deformation of the diaphragm in response to pressure acting to vary the dielectric spacing between the diaphragm plate and a second plate to produce a corresponding change in the value of the capacitance. The coupling assembly includes a body component having a column section and a base section, the column section being received within the cylinder of the sensor with its head spaced from the diaphragm to define therewith a sensor chamber which communicates through a passage in the column section with an isolation chamber formed at the bottom of the base section and sealed by a barrier diaphragm. The chambers and the passage are filled with hydraulic fluid whereby pressure applied to the barrier diaphragm by the fluid to be metered is transmitted to the sensor diaphragm.
-
Citations
9 Claims
-
1. A capacitive pressure transducer for measuring fluid pressure comprising:
-
A. a pressure sensor formed by a cylinder having one end enclosed by a deformable metal diaphragm that serves as one plate of a capacitor whose second plate is spaced from the diaphragm by an air gap constituting the dielectric of the capacitor, deformation of the sensor diaphragm in response to pressure acting to vary the air gap to produce a corresponding change in the value of the capacitance; and B. a coupling assembly adapted to hydraulically convey the pressure of the fluid to be measured to the pressure sensor while isolating the structure of the sensor from the fluid, said assembly including a body component having a column section and a base section, the column section being received within the cylinder with its head spaced from the sensor diaphragm to define therewith a sensor chamber which communicates through a passage in the column section with an isolation chamber formed at the bottom of the base section and sealed by a barrier diaphragm, the chambers and the passage being filled with hydraulic fluid whereby the pressure of fluid imposed on the barrier diaphragm is transferred to the sensor diaphragm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
Specification