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BR8207720A - Circuito de medicao de impedancia - Google Patents

Circuito de medicao de impedancia

Info

Publication number
BR8207720A
BR8207720A BR8207720A BR8207720A BR8207720A BR 8207720 A BR8207720 A BR 8207720A BR 8207720 A BR8207720 A BR 8207720A BR 8207720 A BR8207720 A BR 8207720A BR 8207720 A BR8207720 A BR 8207720A
Authority
BR
Brazil
Prior art keywords
impedance
medication
circuit
medication circuit
impedance medication
Prior art date
Application number
BR8207720A
Other languages
English (en)
Inventor
Earl A Grindheim
Original Assignee
Rosemount Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Rosemount Inc filed Critical Rosemount Inc
Publication of BR8207720A publication Critical patent/BR8207720A/pt

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • 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
    • G01L9/125—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 with temperature compensating means

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Fluid Pressure (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Indication And Recording Devices For Special Purposes And Tariff Metering Devices (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
BR8207720A 1981-06-01 1982-05-27 Circuito de medicao de impedancia BR8207720A (pt)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/269,415 US4391146A (en) 1981-06-01 1981-06-01 Parallel T impedance measurement circuit for use with variable impedance sensor
PCT/US1982/000730 WO1982004317A1 (en) 1981-06-01 1982-05-27 Impedance measurement circuit

Publications (1)

Publication Number Publication Date
BR8207720A true BR8207720A (pt) 1983-05-10

Family

ID=23027142

Family Applications (1)

Application Number Title Priority Date Filing Date
BR8207720A BR8207720A (pt) 1981-06-01 1982-05-27 Circuito de medicao de impedancia

Country Status (9)

Country Link
US (1) US4391146A (pt)
EP (1) EP0079955B1 (pt)
JP (1) JPH0634020B2 (pt)
BR (1) BR8207720A (pt)
CA (1) CA1177121A (pt)
DE (1) DE3280117D1 (pt)
GB (1) GB2118727B (pt)
IL (1) IL66030A (pt)
WO (1) WO1982004317A1 (pt)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4519253A (en) * 1983-04-29 1985-05-28 Rosemount Inc. Reactance measurement circuit with enhanced linearity
JPS6165114A (ja) * 1984-09-06 1986-04-03 Yokogawa Hokushin Electric Corp 容量式変換装置
US5455565A (en) * 1993-11-08 1995-10-03 Ivac Corporation Fluid monitor system and method using a resonator
US6366099B1 (en) 1999-12-21 2002-04-02 Conrad Technologies, Inc. Differential capacitance sampler
AUPQ663600A0 (en) * 2000-04-03 2000-05-04 Accent Hydroponics Pty Ltd Electrical conductivity measurement circuit
KR100624365B1 (ko) * 2004-12-01 2006-09-18 주식회사 파워트론 축전지셀 단자전압 및 내부 임피던스 측정 회로
US7234357B2 (en) * 2004-10-18 2007-06-26 Silverbrook Research Pty Ltd Wafer bonded pressure sensor
DE102006011239B3 (de) * 2006-03-10 2007-10-11 Infineon Technologies Ag Sensorschaltung zum Messen einer Messgröße
US8299681B2 (en) * 2009-03-06 2012-10-30 Life Services, LLC Remotely adjustable reactive and resistive electrical elements and method
US9500727B2 (en) 2012-04-20 2016-11-22 Regents Of The University Of Minnesota System and method for control of RF circuits for use with an MRI system
WO2013169356A1 (en) * 2012-05-10 2013-11-14 Access Business Group International Llc System and method for measuring variable impedance elements in a wireless sensor
US10191128B2 (en) 2014-02-12 2019-01-29 Life Services, LLC Device and method for loops-over-loops MRI coils
CN119511182B (zh) * 2025-01-21 2025-04-18 四川大学 电容式电压互感器频率特性测量方法、系统、终端及介质

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US2173427A (en) * 1937-08-30 1939-09-19 Gen Radio Co Electric oscillator
US2319965A (en) * 1941-06-14 1943-05-25 Bell Telephone Labor Inc Variable frequency bridge stabilized oscillator
US2341067A (en) * 1941-06-14 1944-02-08 Bell Telephone Labor Inc Variable frequency bridge stabilized oscillator
US2423505A (en) * 1943-08-09 1947-07-08 Rca Corp Bridge stabilized oscillator
US2466904A (en) * 1945-02-13 1949-04-12 Bell Telephone Labor Inc Stabilized oscillator
US2441567A (en) * 1945-02-13 1948-05-18 Bell Telephone Labor Inc Variable frequency oscillator
US2439245A (en) * 1945-06-02 1948-04-06 Philco Corp Resistance-capacitance type oscillator
US2586167A (en) * 1945-07-03 1952-02-19 Us Navy Oscillator
US2568868A (en) * 1946-11-15 1951-09-25 Rca Corp Oscillation generator
US2506723A (en) * 1947-12-31 1950-05-09 Stromberg Carlson Co Electrical generation of musical tones
US2827569A (en) * 1956-01-18 1958-03-18 Phillip L Jessen Stabilized oscillator
US2927282A (en) * 1958-04-24 1960-03-01 Gardberg Joseph Oscillator and filter circuits
US2963642A (en) * 1958-08-01 1960-12-06 Shell Oil Co Method and apparatus for determining directional dielectric anisotropy in solids
US3120633A (en) * 1960-02-01 1964-02-04 Gen Electric Series inverter circuit having controlled rectifiers with power diodes in reverse parallel connection
US3049675A (en) * 1960-12-30 1962-08-14 Bell Telephone Labor Inc Method and apparatus for synchronizing oscillators
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US3445835A (en) * 1965-11-09 1969-05-20 R F Controls Inc Capacitive proximity sensor
US3317854A (en) * 1966-05-10 1967-05-02 Bendix Corp Bridge-t oscillator circuit with gain control
US3535430A (en) * 1967-01-23 1970-10-20 Motorola Inc Transistor frequency glide control for musical twin-t oscillator tone generators
US3446075A (en) * 1967-02-01 1969-05-27 Nat Res Corp Apparatus for absolute pressure measurement
US3555448A (en) * 1969-06-03 1971-01-12 Data Research Corp Transducer controlled variable frequency wien-bridge oscillator
US3639832A (en) * 1969-12-11 1972-02-01 Ema Dorries Gmbh Electrical bridge apparatus for and method of measuring mechanical forces by magnetoelastic members
US3671857A (en) * 1970-04-29 1972-06-20 Karlis Alfredovich Bergmanis Device for measuring permittivity of materials
US3815050A (en) * 1971-02-05 1974-06-04 Microsystems Int Ltd Temperature stable tone generator
US3746975A (en) * 1971-08-20 1973-07-17 Drexelbrook Controls Measuring characteristics of materials by using susceptive and conductive components of admittance
US3800242A (en) * 1972-01-28 1974-03-26 C Zimmerman Temperature compensated liquid metering system and method
US3793585A (en) * 1972-02-02 1974-02-19 M Wilska Moisture monitor having a resistor between sensing capacitor and oscillator tuned input to improve oscillator response
US3793596A (en) * 1972-06-01 1974-02-19 Westinghouse Air Brake Co Vital level detector and {37 and{38 {0 gate circuit arrangement employing a twin-tee oscillator
US3859575A (en) * 1974-02-11 1975-01-07 Lee Shih Ying Variable capacitance sensor
DE2433080C2 (de) * 1974-07-10 1983-09-29 Philips Patentverwaltung Gmbh, 2000 Hamburg Schaltungsanordnung zur Umwandlung einer Brückenverstimmung in eine Frequenzänderung
US4091683A (en) * 1976-09-27 1978-05-30 Panex, Inc. Single channel electrical comparative measuring system
JPS6139330Y2 (pt) * 1977-06-30 1986-11-11
US4136315A (en) * 1977-07-27 1979-01-23 Westinghouse Air Brake Company Low and high frequency oscillators having common voltage regulator circuit
US4389646A (en) * 1980-04-30 1983-06-21 Fuji Electric Co. Ltd. Displacement converting circuit arrangement

Also Published As

Publication number Publication date
GB2118727A (en) 1983-11-02
WO1982004317A1 (en) 1982-12-09
DE3280117D1 (de) 1990-04-05
GB2118727B (en) 1985-05-01
US4391146A (en) 1983-07-05
JPS58500872A (ja) 1983-05-26
EP0079955A4 (en) 1987-01-10
CA1177121A (en) 1984-10-30
IL66030A0 (en) 1982-09-30
EP0079955A1 (en) 1983-06-01
EP0079955B1 (en) 1990-02-28
JPH0634020B2 (ja) 1994-05-02
IL66030A (en) 1985-02-28

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Legal Events

Date Code Title Description
B21A Patent or certificate of addition expired [chapter 21.1 patent gazette]

Free format text: PATENTE EXTINTA EM 27/05/97