Resources Contact Us Home
Capacitance pressure transducer

Image Number 3 for United States Patent #5271277.

The present invention provides a capacitance pressure transducer of increased thermal and mechanical stability and thus performance over prior art designs. A cell formed by a cell housing containing a plane parallel capacitor plate and an inlet tube is connected to an outer protective cover solely by the inlet tube. The cell housing is contained within an air tight environmental enclosure (also supported solely by the inlet tube) of sufficient rigidity as to isolate the cell housing from changes in atmospheric pressure. The plane parallel capacitor plate is formed by a circular diaphragm peripherally connected to the tension ring and an electrode disk located within the tension ring. The capacitor plate is mechanically isolated by a connection between the tension ring and the cell housing that is more flexible than the tension ring itself and a mounting for the electrode disk by which the electrode disk is connected solely to the tension ring by an annular support member holding the electrode disk in a fixed position relative to the diaphragm. Additionally a baffle plate divides the cell housing into baffle and diaphragm chambers to allow the gas to reach thermal equilibrium with the cell before exposure thereof to the diaphragm. Also, the baffle chamber and inlet tube have characteristic dimensions greater than the mean free path of gas molecules at the lowest pressure to be measured to suppress thermal transpiration effects.

  Recently Added Patents
Pyrazole kinase modulators and methods of use
Targeting agents for enhancing radiation therapy
Measuring apparatus for measuring a physical property of a sample
Processing data using information embedded in a data request
Data encoding and decoding apparatus and method thereof for verifying data integrity
Power surface mount light emitting die package
System and method for managing a loyalty program via an association network infrastructure
  Randomly Featured Patents
Portion of a compound leverage hand tool
Method and apparatus for forming a multi-lobed winding for the stator of an alternator
Velocity interferometer with continuously variable sensitivity
Fail safe mechanism for automatically de-energizing a multi-post vehicle hoist
Flow valve
Sealing band for water-resistant camera housing
Electrical cable gland embodying sealing arrangement
Party table
Golf ball