Measuring and testing – Fluid pressure gauge – Bourdon
Patent
1991-10-03
1993-05-04
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Bourdon
73718, 73724, 73862473, 361283, G01L 704, G01L 912
Patent
active
052077675
ABSTRACT:
A dual capacitor device for utilizing dependent capacitances for measurement purposes where a first capacitor base member and a second capacitance base member are arranged with parallel capacitor surfaces in parallel planes and where the parallel capacitor surfaces are located on opposite sides relative to a central transverse plane to define first and second capacitors. The second capacitor base member has a centrally located section connected to an outer section of the second capacitor base member by a torsion beam and the centrally located section is attached to the first capacitor base member by a coupling member. Angular displacement of the outer section relative to the centrally located section about the displacement axis produces a capacitance change in the first and second capacitors. A torque force applied to the outer section by a spirally wound bourdon tube in response to pressure develops a low force on the torsion beam which is less than the micro yield point of the torsion beam material and develops a micro dimensional angular displacement of the outer section of the second capacitance base member and a capacitance change as a function of the force.
REFERENCES:
patent: 2563899 (1951-08-01), Wiancko
patent: 4873870 (1989-10-01), Delatorre
Fidler Donald H.
Panex Corporation
Woodiel Donald O.
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