Pressure sensors
AssigneeGeneral Electric Company
InventorsKenneth Brakeley Welles, II, Michael Paul Weir
Life of this patent
Estimating the term…
Abstract
A pressure sensor having structure for generating a magnetic force to balance forces on opposing sides of a flexible diaphragm centered within a pressure chamber allows fluid pressure to be introduced into the chamber on one side of the diaphragm. A first magnetic coil is positioned on another side of the diaphragm and a second coil is mounted to the diaphragm. When fluid pressure is introduced into the pressure chamber, the diaphragm deflects, and the magnitude of current required to generate a recentering magnetic force which causes the diaphragm to be recentered constitutes a measure of the fluid pressure. Since the recentering magnetic force is substantially unaffected by temperature, the fluid pressure measurement obtained is substantially independent of temperature.
Claims17
A pressure sensor, comprising:
- a pressure chamber;
- a diaphragm positioned within said chamber and separating said chamber into first and second chamber sections;
- a first circuit positioned within said first chamber section and comprising a first capacitor plate and a first coil;
- a second circuit positioned within said second chamber section and comprising a second capacitor plate;
- a second coil mounted to said diaphragm;
- and
- a third capacitor plate mounted to said diaphragm, said first and second capacitor plates being substantially equidistant from said third capacitor plate when no pressure differential is present across said diaphragm.
A pressure sensor, comprising:
- a pressure chamber;
- a diaphragm positioned within said chamber and separating said chamber into first and second chamber sections;
- a first coil located in said first chamber section;
- a second coil mounted to said diaphragm;
- a first capacitor plate located in said first chamber section;
- a second capacitor plate located in said second chamber section;
- and
- a third capacitor plate mounted to said diaphragm.
Dependencies are inferred from the claim text.