Capacitor and pressure transducer
First Claim
1. A dual capacitor device for utilizing dependent capacitances for measurement purposes comprising:
- an upper capacitor base member and a fixed lower capacitance base member arranged with parallel capacitor surfaces in horizontal planes where said parallel capacitor surfaces are located on opposite sides relative to a vertical central axis and said capacitance surfaces define first and second capacitors;
said lower capacitor base member having a centrally located section connected to an outer section of said lower capacitor base member by a torsion beam member, said centrally located section being attached to said upper capacitor base member by a vertical arm member;
said torsion beam member having a displacement axis normal to said central axis so that angular displacement of said torsion beam member and said centrally located section about said displacement axis produces a capacitance change in said first and second capacitors; and
force means coupled to said centrally located section in a diametrically located position to said torsion beam member for producing a torsion moment force on said torsion beam member for developing angular displacement of said centrally located section and a capacitance change as a function of said torsion moment force.
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Accused Products
Abstract
A dual capacitor device for utilizing dependent capacitances for measurement purposes where an upper capacitor base member and a lower capacitance base member are arranged with parallel capacitor surfaces in horizontal planes and where the parallel capacitor surfaces are located on opposite sides relative to a vertical axis to define first and second capacitors. The lower capacitor base member has a centrally located section connected to an outer section of the lower capacitor base member by a torsion beam and the centrally located section is attached to the upper capacitor base member by a vertical arm member. The torsion beam means has a displacement axis normal to the central axis so that angular displacement of the torsion beam and the centrally located section about the displacement axis produces a capacitance change in the first and second capacitors. A force moment applied to the centrally located 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 centrally located section and a capacitance change as a function of the force to measure high pressures with small deflections of the capacitor. The structure is arranged to compensate for changing temperature.
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Citations
12 Claims
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1. A dual capacitor device for utilizing dependent capacitances for measurement purposes comprising:
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an upper capacitor base member and a fixed lower capacitance base member arranged with parallel capacitor surfaces in horizontal planes where said parallel capacitor surfaces are located on opposite sides relative to a vertical central axis and said capacitance surfaces define first and second capacitors; said lower capacitor base member having a centrally located section connected to an outer section of said lower capacitor base member by a torsion beam member, said centrally located section being attached to said upper capacitor base member by a vertical arm member; said torsion beam member having a displacement axis normal to said central axis so that angular displacement of said torsion beam member and said centrally located section about said displacement axis produces a capacitance change in said first and second capacitors; and force means coupled to said centrally located section in a diametrically located position to said torsion beam member for producing a torsion moment force on said torsion beam member for developing angular displacement of said centrally located section and a capacitance change as a function of said torsion moment force. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification