GB1386082A - Fluid pressure transducers - Google Patents
Fluid pressure transducersInfo
- Publication number
- GB1386082A GB1386082A GB821671A GB821671A GB1386082A GB 1386082 A GB1386082 A GB 1386082A GB 821671 A GB821671 A GB 821671A GB 821671 A GB821671 A GB 821671A GB 1386082 A GB1386082 A GB 1386082A
- Authority
- GB
- United Kingdom
- Prior art keywords
- attached
- moving electrode
- bellows
- lever
- arm
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
- G01L11/004—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by the use of counterbalancing forces
- G01L11/008—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by the use of counterbalancing forces electrostatic or electromagnetic counterbalancing forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/0033—Transmitting or indicating the displacement of bellows by electric, electromechanical, magnetic, or electromagnetic means
- G01L9/0038—Transmitting or indicating the displacement of bellows by electric, electromechanical, magnetic, or electromagnetic means using variations in capacitance
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/12—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in capacitance, i.e. electric circuits therefor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Measuring Fluid Pressure (AREA)
- Linear Motors (AREA)
Abstract
1386082 Measuring pressure electrically JOSEPH LUCAS (INDUSTRIES) Ltd 17 March 1972 [26 March 1971] 8216/71 Heading G1N [ Also in Division H1] In a force balancing arrangement for measuring pressure, a bellows 20 Fig. 3, subjected to the test pressure externally or internally or both, for measuring differential pressure, is attached to the central, moving electrode 35 of a differential capacitor, the change in capacitance being measured in a bridge circuit Fig. 9 to produce a corresponding direct current which is fed to an electromagnetic force applying device 24 which restores the bellows and the moving electrode substantially to their normal positions. The assembly is mounted on three inter-connected fixed members 10, 11, 12. One end of the bellows 20 is attached by plug 21 to bracket member 12, and the other end is attached by plug 22 to an arm 16 and by a flexible strip 19 to a lever 15. The moving electrode 35 of the differential capacitor is bolted to arm 16, the fixed electrodes 30, 31 are mounted on a spacer 29, leaving a gap between them for the moving electrode 35, and spacer 29 is mounted on the frame member 10. The electromagnetic force applying device 24 comprises a core 25, shaped as a spool to carry two primary and two secondary windings, which is secured to the frame 10 by three bolts 28 arranged equi-angularly round a captive ball 26, whereby the orientation of core 25 can be adjusted. Surrounding the core is a tubular armature 23 rigidly attached to lever 15. Intermediate bracket member 11 is attached by crossed leaf hinges 18 to lever 15 at one end and by similar hinges 17 to arm 16 at the other end 11a, whereby bracket 11 acts as a pivotal support for lever 15 and arm 16 about spaced parallel axes. The differential capacitor comprising electrodes 30, 31, 35 is connected in a bridge circuit Fig. 9 with inductors 42, 43, energised by an oscillator 40. A pressure change on bellows 20 produces movement of central electrode 35 which unbalances the bridge, the unbalance voltage being amplified by transistors 51, 52 and phase rectified by components 56 to 65, further amplified by transistors 68, 72 and fed to opposed half windings 75, 76 of the force applying device 24. Two further half windings 82, 83 are fed with a constant D.C. from source 84 to polarize the core 25. Thus the device 24 substantially restores the moving electrode 35 to its normal position, and the current in windings 75, 76 to do this is measured across resistor 77 and is proportional to the test pressure.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB821671A GB1386082A (en) | 1971-03-26 | 1971-03-26 | Fluid pressure transducers |
US00237023A US3723926A (en) | 1971-03-26 | 1972-03-22 | Fluid pressure transducers |
FR7210935A FR2130729B1 (en) | 1971-03-26 | 1972-03-23 | |
IT49199/72A IT954390B (en) | 1971-03-26 | 1972-03-24 | ELECTROMAGNETIC FORCE APPLICATION DEVICE AND TRANSDUCER INCLUDING IT |
DE19722214751 DE2214751A1 (en) | 1971-03-26 | 1972-03-25 | Electromagnetic force exerting device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB821671A GB1386082A (en) | 1971-03-26 | 1971-03-26 | Fluid pressure transducers |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1386082A true GB1386082A (en) | 1975-03-05 |
Family
ID=9848151
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB821671A Expired GB1386082A (en) | 1971-03-26 | 1971-03-26 | Fluid pressure transducers |
Country Status (5)
Country | Link |
---|---|
US (1) | US3723926A (en) |
DE (1) | DE2214751A1 (en) |
FR (1) | FR2130729B1 (en) |
GB (1) | GB1386082A (en) |
IT (1) | IT954390B (en) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6477404B1 (en) | 2000-03-01 | 2002-11-05 | Cardiac Pacemakers, Inc. | System and method for detection of pacing pulses within ECG signals |
US6684102B1 (en) * | 2000-11-03 | 2004-01-27 | Cardiac Pacemakers, Inc. | Implantable heart monitors having capacitors with endcap headers |
US6699265B1 (en) | 2000-11-03 | 2004-03-02 | Cardiac Pacemakers, Inc. | Flat capacitor for an implantable medical device |
US6833987B1 (en) | 2000-11-03 | 2004-12-21 | Cardiac Pacemakers, Inc. | Flat capacitor having an active case |
US6571126B1 (en) | 2000-11-03 | 2003-05-27 | Cardiac Pacemakers, Inc. | Method of constructing a capacitor stack for a flat capacitor |
US7355841B1 (en) * | 2000-11-03 | 2008-04-08 | Cardiac Pacemakers, Inc. | Configurations and methods for making capacitor connections |
US6522525B1 (en) * | 2000-11-03 | 2003-02-18 | Cardiac Pacemakers, Inc. | Implantable heart monitors having flat capacitors with curved profiles |
US7456077B2 (en) * | 2000-11-03 | 2008-11-25 | Cardiac Pacemakers, Inc. | Method for interconnecting anodes and cathodes in a flat capacitor |
US6509588B1 (en) * | 2000-11-03 | 2003-01-21 | Cardiac Pacemakers, Inc. | Method for interconnecting anodes and cathodes in a flat capacitor |
US6687118B1 (en) | 2000-11-03 | 2004-02-03 | Cardiac Pacemakers, Inc. | Flat capacitor having staked foils and edge-connected connection members |
US7107099B1 (en) * | 2000-11-03 | 2006-09-12 | Cardiac Pacemakers, Inc. | Capacitor having a feedthrough assembly with a coupling member |
US7951479B2 (en) | 2005-05-11 | 2011-05-31 | Cardiac Pacemakers, Inc. | Method and apparatus for porous insulative film for insulating energy source layers |
US7479349B2 (en) * | 2002-12-31 | 2009-01-20 | Cardiac Pacemakers, Inc. | Batteries including a flat plate design |
US7224575B2 (en) | 2004-07-16 | 2007-05-29 | Cardiac Pacemakers, Inc. | Method and apparatus for high voltage aluminum capacitor design |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB278673A (en) * | 1926-10-05 | 1928-03-08 | Michael Surjaninoff | Electromagnet energised by polyphase currents |
DE667066C (en) * | 1934-08-23 | 1938-11-03 | Siemens Schuckertwerke Akt Ges | Electromagnet |
FR897339A (en) * | 1942-02-21 | 1945-03-19 | Askania Werke Ag | Motor magnet for control or regulation devices |
US3389355A (en) * | 1964-06-05 | 1968-06-18 | Fred Schroeder Jr. | Multiple coil solenoid |
US3373343A (en) * | 1965-11-24 | 1968-03-12 | Johnson Service Co | Pressure-electric transducers with performance stabilization |
US3460081A (en) * | 1967-05-31 | 1969-08-05 | Marotta Valve Corp | Electromagnetic actuator with permanent magnets |
US3663911A (en) * | 1971-04-22 | 1972-05-16 | Pickering & Co Inc | Variable scale differential transformer |
-
1971
- 1971-03-26 GB GB821671A patent/GB1386082A/en not_active Expired
-
1972
- 1972-03-22 US US00237023A patent/US3723926A/en not_active Expired - Lifetime
- 1972-03-23 FR FR7210935A patent/FR2130729B1/fr not_active Expired
- 1972-03-24 IT IT49199/72A patent/IT954390B/en active
- 1972-03-25 DE DE19722214751 patent/DE2214751A1/en active Pending
Also Published As
Publication number | Publication date |
---|---|
IT954390B (en) | 1973-08-30 |
US3723926A (en) | 1973-03-27 |
DE2214751A1 (en) | 1972-10-12 |
FR2130729A1 (en) | 1972-11-03 |
FR2130729B1 (en) | 1974-08-02 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |