Measuring and testing – Fluid pressure gauge – Diaphragm
Patent
1989-11-20
1991-06-18
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Diaphragm
73724, 361283, G01L 912
Patent
active
050240994
ABSTRACT:
A transducer measures the pressure of a fluid within a hollow conduit, typically one with a circular cross-section, having a central region that is deformed to a non-circular cross-section. This non-circular portion of the conduit displaces radially and repeatably without hysteresis in response to the pressure of the fluid in the conduit in a manner that corresponds to the pressure. A variable capacitor assembly, or a set of strain gauges mounted on the exterior of the non-circular portion, produce an electrical signal proportional to the radial displacement or to the strain, respectively. In one capacitive form, a pair of electrodes are mounted on opposite sides of the non-circular portion formed as free end portions of metallic sheet members with a central channel. In another capacitive form, electrodes are mounted at one or both ends of lever arms which in turn are coupled to the non-circular portion with a set of flexure plates to produce a mechanical amplification of the radial displacement.
REFERENCES:
patent: 2420148 (1947-05-01), Ostergren
patent: 3046788 (1962-07-01), Laimins
patent: 4207551 (1980-06-01), Kautzky
patent: 4484479 (1984-11-01), Eckhardt
Setra Systems, Inc.
Woodiel Donald O.
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