[특허]Capacitance-type material level indicator

[미국특허] Capacitance-type material level indicator 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01G-023/26 G01R-035/00
출원번호	US-0841027 (1986-03-17)
발명자 / 주소	Eichberger Robert T. (Mt. Clemens MI)
출원인 / 주소	Berwind Corporation (Philadelphia PA 02)
인용정보	피인용 횟수 : 38 인용 특허 : 13

초록 ▼

A system for indicating the level of material in a vessel as a function of material capacitance comprising a resonant circuit including a capacitance probe adapted to be disposed in a vessel so as to be responsive to variations in capacitance as a function of material level. An rf oscillator has outputs coupled to the resonant circuit and to a phase detector for detecting variations in phase angle as a function of probe capacitance. Level detection circuitry is responsive to an output of the phase detector and to a reference signal indicative of a predetermined level of material for indicating material level as a function of a difference between capacitance at the probe and the reference signal. An automatic calibration circuit adjusts the resonance characteristics of the parallel resonant circuit. A remote module provides facility for initiating a system-test and a system-calibrate operation, either individually or sequentially.

대표청구항 ▼

A system for indicating point level of material in a vessel as a function of material capacitance comprising probe means adapted to be coupled to a vessel so as to be responsive to variations in capacitance as a function of material level in the vessel; circuit means including rf oscillator means and resonant circuit means coupled to said probe means, and phase detection means responsive to variations in phase angle at said oscillator means and said resonant circuit means as a function of capacitance at said probe means; means responsive to said phase detection means for indicating a first point level condition of material in the vessel adjacent to said probe when capacitance at said probe means reaches a preselected level greater than empty-vessel capacitance at said probe means and output of said phase detection means obtains a corresponding first predetermined output characteristic; and test means for testing operation of said circuit means and said indicating means to indicate said first point level condition, said test means including means for selectively initiating a test operation, and means coupled to said circuit means and responsive to said initiating means for selectively varying output of said phase detection means to said first predetermined output characteristic, and thereby simulating said first point level condition at said indicating means, independently of actual level of material at said probe means.

이 특허에 인용된 특허 (13) 인용/피인용 타임라인 분석

Rubel Ira A. (Smithtown NY) Steiner Herbert A. (Whitestone NY) Ritter Charles H. (Ronkonkoma NY), Apparatus for testing a capacitance responsive gaging system.
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Pettersen Aage (North Reading MA) Schulkind Herbert (Natic MA), Automatic calibration system.
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Siegel, Leon S.; Holman, Charles O., Capacitance circuit for level measurement.
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Beaman Norman V. (La Habra CA), Capacitance probe for high resistance materials.
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Fathauer George H. (Mesa AZ) Hood Charles F. (Mesa AZ), Capacitance-type material level indicator.
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Fathauer George H. (Mesa AZ) Hood Charles F. (Mesa AZ) Runck Robin B. (Sherman Oaks CA), Capacitance-type material level indicator.
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Fathauer, George H.; Hood, Charles F., Capacitance-type material level indicator.
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Piso John S. (Framingham MA), Capacitive measuring system with automatic calibration.
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Geiger Wolfgang (Greenwood IN), Control system for a capacitive level sensor.
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Brenton Ronald G. (Marysville MI) Runck Robin B. (Sherman Oaks CA), Method of manufacturing capacitance-type material level indicator probe.
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Beaman, Norman V.; Sellers, Gary B., Microprocessor based capacitance level detection system.
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Gerchman Robert D. (New Brighton MN) Newport Ronald L. (Fridley MN) van Dyke Martin J. (Minneapolis MN), Test unit for aircraft fuel gaging system.
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Blanchard Robert L. (Lexington MA) Sherburne Arthur E. (Hollis NH) Williams Robert A. (Burlington MA), Transfer calibration system.
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이 특허를 인용한 특허 (38) 인용/피인용 타임라인 분석

Duan, Justin, Apparatus and method for improving the accuracy of measurements taken with a capacitance-type sensor.
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Clark Frederick L. (Plano TX) Hendrick Kendall B. (Southlake TX) Martin Richard R. (Irving TX) Moore Larry W. (Plano TX) Raymoure William J. (Lake Bluff IL) Schrier Paul R. (Carrollton TX) Walker Edn, Apparatus and method for washing clinical apparatus.
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Otto, Johanngeorg; Lubcke, Wolfgang, Arrangement for measuring the level of contents in a container.
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Miller,Lawrence F., Auto-deep scan for capacitive sensing.
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Walker Donny R. (Coppell TX) Vaught James A. (Euless TX) Hills David B. (Plano TX), Automated liquid level sensing system.
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Miyagawa Yuichi (Osaka JPX) Yoneda Kiwamu (Osaka JPX) Kuwa Kazuhiro (Osaka JPX) Kogo Katsuyuki (Osaka JPX), Automatic calibration apparatus for a partial gas pressure measuring sensor.
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Clark Frederic L. (Plano TX) Hendrick Kendall B. (Southlake TX) Martin Richard R. (Irving TX) Moore Larry W. (Plano TX) Raymoure William J. (Lake Blluff IL) Schrier Paul R. (Carrollton TX) Walker Edn, Cap actuator for opening and closing a container.
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Brenner Raul ; Esin Alex J. ; Jones Lawrence J. ; Rosselson Boris, Capacitance level sensor.
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Carter,Larry, Depth determining system.
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Heger Charles E. ; Long James C. ; Marshall Noel H. C. ; Dodd Paul W., Dual transmitter visual display system.
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Heger Charles E. ; Dodd Paul W., Electronic wall-stud sensor display.
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Heger Charles E. ; Dodd Paul W., Electronic wall-stud sensor with three capacitive elements.
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Lipscomb, James H.; Jurik, Anna; Katz, Bernard; Keating, Michael J.; Klengler, Stone; Kotlarik, John J.; Wroblewski, Mieczyslaw, Fluid dispense verification system.
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Lipscomb, James H.; Jurik, Larry; Katz, Bernard; Keating, Michael J.; Klengler, Stone; Kotlarik, John J.; Wroblewski, Mieczyslaw, Fluid transfer system.
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Calderoni, Anthony, Fluid volume verification system.
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Nash,Derek J.; Smith,John C.; Spanski,Jeffrey L.; Williams,Michael, Intersecting laser line generating device.
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Nash,Derek J.; Smith,John C.; Spanski,Jeffrey L.; Williams,Michael, Intersecting laser line generating device.
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Nash,Derek J.; Smith,John C.; Spanski,Jeffrey L.; Williams,Michael, Intersecting laser line generating device.
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Nash,Derek J., Laser line projected on an edge of a surface.
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Clark Frederic L. ; Martin Richard R. ; Moore Larry W. ; Clemens John M. ; Rumbaugh William D. ; Smith B. Jane, Liquid heater assembly with a pair temperature controlled electric heating elements and a coiled tube therebetween.
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Lease Benjamin N. ; Pierson Otis P., Liquid level transmitter.
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Cruickshank William T., Material level sensing system calibration.
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Clark Frederick L. (Plano TX) Martin Richard R. (Irving TX) Moore Larry W. (Plano TX) Wohlford Robert A. (Irving TX), Meia cartridge feeder.
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Lipscomb, James H.; Jurik, Anna; Katz, Bernard; Keating, Michael J.; Klengler, Stone; Kotlarik, John J.; Wroblewski, Mieczyslaw, Method of detecting a fluid surface.
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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.
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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.
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Miller,Lawrence F., Ratiometric stud sensing.
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Clark Frederick L. (Plano TX) Hendrick Kendall B. (Southlake TX) Martin Richard R. (Irving TX) Moore Larry W. (Plano TX) Raymoure William J. (Lake Bluff IL) Schrier Paul R. (Carrollton TX) Walker Edn, Sample container segment assembly.
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Clark Frederick L. ; Hendrick Kendall B. ; Martin Richard R. ; Moore Larry W. ; Raymoure William J. ; Schrier Paul R. ; Walker Edna S. ; Walker Donny Ray ; Winter Gary E. ; Cloonan Kevin M. ; Yost Da, Sample container segment assembly.
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Clark Frederick L. ; Moore Larry W. ; Walker Donny Ray ; Clemens John M ; Kanewske ; III William J. ; Smith B. Jane, Sample container segment assembly.
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Tayi Apparao, Scheduling operation of an automated analytical system.
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Gist,Leslie Daily, Stud finder.
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Levine,Steven R.; Gist,Leslie D., Stud finder.
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Heger Charles E. (Saratoga CA), Stud sensor with over-stud miscalibration via circuit which stores an initial calibration density, compares that to a cu.
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Heger Charles E., Swept range gate radar system for detection of nearby objects.
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Rauchwerger George P. (Sunnyvale CA), Threshold level calibration method and apparatus.
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John A. Kielb ; Scott D. Manicor, Two-wire level transmitter.
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Heger Charles E., Ultra-wideband swept range gate radar system with variable transmitter delay.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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[미국특허] Capacitance-type material level indicator 원문보기