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Guarded capacitance probe and related measurement circuit

IPC분류정보
국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판)
  • G01R-027/26
  • G01F-023/26
출원번호 US-0370306 (1995-01-09)
발명자 / 주소
  • Rauchwerger George P. (Sunnyvale CA)
출원인 / 주소
  • Flowline Inc. (Seal Beach CA 02)
인용정보 피인용 횟수 : 32  인용 특허 : 17

초록

A continuous liquid level measuring system having a guarded capacitance probe and related drive circuit for providing accurate level measurements, even when measuring the level of ionic and highly viscous fluids. The capacitance probe has two parallel electrodes, each constructed of a half-tube sect

대표청구항

A circuit for measuring the capacitance of a capacitance probe, comprising: an excitation circuit having a drive terminal and an output terminal, wherein the excitation circuit provides an excitation signal with respect to ground at the drive terminal for exciting the capacitance probe, and further

이 특허에 인용된 특허 (17)

  1. Buschmann Gerhard (Dusseldorf DEX), Apparatus for dispensing very small quantities of liquid.
  2. Siegel, Leon S.; Holman, Charles O., Capacitance circuit for level measurement.
  3. Kuhlman George A. (St. Charles IL), Capacitance level sensor for use with viscous, electrically conductive materials.
  4. Rauchwerger George P. (c/o Expo Instruments Inc. ; 183-D Commercial Ave. Sunnyvale CA 94086), Capacitance probe and system for precision measurement of liquid level.
  5. Fathauer George H. (Mesa AZ) Hood Charles F. (Mesa AZ), Capacitance-type material level indicator.
  6. Wells Paul (Newberg OR), Capacitive fluid level sensor.
  7. Boie Robert A. (Westfield NJ) Miller Gabriel L. (Westfield NJ), Capacitive proximity sensors.
  8. Franz Hans-Jurgen (Schopfheim DT) Rottmar Werner (Lorrach DT), Capacitive sensor.
  9. Geiger Wolfgang (Greenwood IN), Control system for a capacitive level sensor.
  10. Tward Emanuel (Northridge CA), Fluid level sensor.
  11. Kumada Akira (Kanagawa JPX) Matsuo Kenji (Kanagawa JPX) Ochiai Chitaka (Kanagawa JPX), Level sensor.
  12. Hull Harold L. (401 Canyon Way Sp. 43 Spanks NE 89431), Liquid level sensing system.
  13. Wagner Edward D. (Rogue River OR) Trautwein Richard R. (Rogue River OR), Moisture measuring method and apparatus.
  14. Tward Emanuel (Northridge CA) Junkins Philip D. (Los Angeles CA), Multi-capacitor fluid level sensor.
  15. Maltby Frederick L. (Jenkintown PA) Woerner Edward R. (North Wales PA) Meacham ; Jr. Thomas E. (Holland PA) Petersen Steven R. (Ambler PA), Probe system for measuring the condition of materials.
  16. Sun Robert J. (Bala Cynwyd PA) Maltby Frederick L. (Jenkintown PA), RF admittance measuring method and apparatus for determining the level of a conductive liquid.
  17. Franz Han-Jrgen (Schopfheim DEX) Dreyer Volker (Lrrah-Haagen DEX), Rod-like probe for the capacitive measurement of the level in a container.

이 특허를 인용한 특허 (32)

  1. Mireles, Pedro G; Almaraz, Jose L, Apparatus and method for detecting tilt and vibration of a body.
  2. Wernet, Armin; Dieterle, Roland; Krumbholz, Andreas, Apparatus for determining and/or monitoring a process variable.
  3. Mulder Richard,NLX ; Schoenmakers Comelis W. P.,NLX ; Slezak Marian J. W.,NLX, Apparatus for measuring the quality of a fluid in a vessel.
  4. Pomar Longedo Pere,ESX ; Pons Munill Xavier,ESX ; Twose Valls Ivan,ESX ; Alonso Riera Enric,ESX ; Restrepo Guerrero Carlos,ESX ; Perez Puigdomenech Francesc,ESX, Apparatus for performing laboratory tests automatically.
  5. Dana Alfred, Bilge sentry.
  6. Brenner Raul ; Esin Alex J. ; Jones Lawrence J. ; Rosselson Boris, Capacitance level sensor.
  7. Roziere, Didier, Capacitive control interface device and method adapted to the implementation of highly resistive measurement electrodes.
  8. Roziere, Didier; Neel, Christian; Blondin, Christophe, Capacitive sensing device comprising perforated electrodes.
  9. Carter,Larry, Depth determining system.
  10. Michallon, Jannick, Device for level measurement in a reservoir.
  11. Arpin, Jean-Pierre, Device for measuring a level in a tank.
  12. Lipscomb, James H.; Jurik, Anna; Katz, Bernard; Keating, Michael J.; Klengler, Stone; Kotlarik, John J.; Wroblewski, Mieczyslaw, Fluid dispense verification system.
  13. Frazier, Isaac S.; Knierim, David L.; Bonicatto, James M.; Norkitis, Michael, Fluid level sensing system and method.
  14. Frazier, Isaac S.; Knierim, David L.; Bonicatto, James Michael; Norkitis, Michael E., Fluid level sensing system and method.
  15. Lipscomb, James H.; Jurik, Larry; Katz, Bernard; Keating, Michael J.; Klengler, Stone; Kotlarik, John J.; Wroblewski, Mieczyslaw, Fluid transfer system.
  16. Calderoni, Anthony, Fluid volume verification system.
  17. Guo, Shuwen, High temperature capacitive static/dynamic pressure sensors.
  18. Guo, Shuwen, High temperature capacitive static/dynamic pressure sensors and methods of making the same.
  19. Jens Weber DE; Juergen Hoetzel DE; Wolf-Henning Rech DE; Ega Tschiskale DE, Measuring circuit for a capacitive sensor for distance measurement and/or space monitoring.
  20. Puukangas Pertti,FIX ; Sarela Antti,FIX, Method and arrangement for measuring liquid level.
  21. Lipscomb, James H.; Jurik, Anna; Katz, Bernard; Keating, Michael J.; Klengler, Stone; Kotlarik, John J.; Wroblewski, Mieczyslaw, Method of detecting a fluid surface.
  22. Lipscomb, James H.; Jurik, Larry; Katz, Bernard; Keating, Michael J.; Klengler, Stone; Kotlarik, John J.; Wroblewski, Mieczyslaw, Method of detecting fluid flow through a conduit.
  23. Lipscomb, James H.; Jurik, Larry; Katz, Bernard; Keating, Michael J.; Klengler, Stone; Kotlarik, John J.; Wroblewski, Mieczyslaw, Method of detecting fluid flow through a conduit.
  24. Stanley, James G.; Stopper, Jr., Robert A., Occupant detection system.
  25. Gabelich Stephen A., Precise high resolution non-contact method to measure dielectric homogeneity.
  26. Vander Horst, John, Recreational vehicle holding tank sensor probe.
  27. Alkan, Erdogan, Surge protection device for isolating premise devices.
  28. Alkan, Erdogan, Surge protection device with improved response time.
  29. McNichol Randal S., System for measuring capacitance.
  30. Sargent John S. ; Sargent Frank T., Volume charge density measuring system.
  31. Sargent, John S.; Sargent, Frank T., Volume charge density measuring system.
  32. Sargent, John S.; Sargent, Frank T., Volume charge density measuring system.
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