FR2417887A1 - Ensemble comportant un capteur capacitif et un circuit de demodulation - Google Patents

Ensemble comportant un capteur capacitif et un circuit de demodulation

Info

Publication number
FR2417887A1
FR2417887A1 FR7903843A FR7903843A FR2417887A1 FR 2417887 A1 FR2417887 A1 FR 2417887A1 FR 7903843 A FR7903843 A FR 7903843A FR 7903843 A FR7903843 A FR 7903843A FR 2417887 A1 FR2417887 A1 FR 2417887A1
Authority
FR
France
Prior art keywords
capacitive sensor
demodulation circuit
set containing
amplitude
compensation network
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.)
Granted
Application number
FR7903843A
Other languages
English (en)
Other versions
FR2417887B1 (fr
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bendix Corp
Original Assignee
Bendix Corp
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 Bendix Corp filed Critical Bendix Corp
Publication of FR2417887A1 publication Critical patent/FR2417887A1/fr
Application granted granted Critical
Publication of FR2417887B1 publication Critical patent/FR2417887B1/fr
Expired legal-status Critical Current

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
    • G01D5/24—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 by varying capacitance
    • G01D5/241—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 by varying capacitance by relative movement of capacitor electrodes
    • G01D5/2417—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 by varying capacitance by relative movement of capacitor electrodes by varying separation
    • 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
    • G01L9/0041—Transmitting or indicating the displacement of flexible diaphragms
    • G01L9/0072—Transmitting or indicating the displacement of flexible diaphragms using variations in capacitance
    • G01L9/0075—Transmitting or indicating the displacement of flexible diaphragms using variations in capacitance using a ceramic diaphragm, e.g. alumina, fused quartz, glass
    • 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
    • G01L9/0082—Transmitting or indicating the displacement of capsules by electric, electromechanical, magnetic, or electromechanical means
    • G01L9/0086—Transmitting or indicating the displacement of capsules by electric, electromechanical, magnetic, or electromechanical 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
    • 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)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Indication And Recording Devices For Special Purposes And Tariff Metering Devices (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

Ensemble capteur capacitif et démodulateur à diodes qui comprend un réseau de compensation. Le réseau de compensation comporte des moyens pour faire varier l'amplitude d'une fréquence porteuse alternative de manière opposée aux variations produites dans cette amplitude par les erreurs de l'ensemble capteur-démodulateur.
FR7903843A 1978-02-15 1979-02-15 Ensemble comportant un capteur capacitif et un circuit de demodulation Expired FR2417887B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US87805678A 1978-02-15 1978-02-15

Publications (2)

Publication Number Publication Date
FR2417887A1 true FR2417887A1 (fr) 1979-09-14
FR2417887B1 FR2417887B1 (fr) 1985-06-07

Family

ID=25371286

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7903843A Expired FR2417887B1 (fr) 1978-02-15 1979-02-15 Ensemble comportant un capteur capacitif et un circuit de demodulation

Country Status (8)

Country Link
JP (2) JPS54115175A (fr)
AU (1) AU521105B2 (fr)
CA (1) CA1123225A (fr)
DE (1) DE2905463A1 (fr)
ES (1) ES477752A1 (fr)
FR (1) FR2417887B1 (fr)
GB (1) GB2015162B (fr)
IT (1) IT1111910B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2443054A1 (fr) * 1978-12-01 1980-06-27 Besco Ind Inc Transducteur capacitif de force
EP0018283A1 (fr) * 1979-04-16 1980-10-29 The Bendix Corporation Capteur de pression
EP0105120A2 (fr) * 1982-09-30 1984-04-11 International Business Machines Corporation Procédé et appareil pour mesurer des signaux provenant de capteurs différentiels
FR2632069A1 (fr) * 1988-05-30 1989-12-01 Garcia Manuel Capteur de detection par vitesse de variation d'impedance ou par variation d'impedance

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4322977A (en) * 1980-05-27 1982-04-06 The Bendix Corporation Pressure measuring system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1110943A (en) * 1963-10-01 1968-04-24 Sangamo Weston Improvements in or relating to electrical bridge networks
US3648165A (en) * 1970-09-24 1972-03-07 Sun Oil Co Capacitance-measuring apparatus including means maintaining the voltage across the unknown capacitance constant
US3873917A (en) * 1973-03-24 1975-03-25 Hottinger Messtechnik Baldwin Measuring bridge circuit
US3883812A (en) * 1971-12-20 1975-05-13 Nasa Diode-quad bridge circuit means

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3318153A (en) * 1962-12-04 1967-05-09 Rosemount Eng Co Ltd Diode loop capacitor comparative circuit including a pair of transformer windings coupled in phase
US3271669A (en) * 1962-12-04 1966-09-06 Rosemount Eng Co Ltd Alternating current diode loop capacitance measurement circuits
US3646538A (en) * 1969-10-27 1972-02-29 Rosemount Eng Co Ltd Transducer circuitry for converting a capacitance signal to a dc current signal
US3869672A (en) * 1972-05-13 1975-03-04 Int Standard Electric Corp Method and arrangements for the digital control of operating functions, radio and television receivers
JPS5144662A (fr) * 1974-10-08 1976-04-16 Masakichi Kawahara
JPS5252676A (en) * 1975-10-24 1977-04-27 Yokogawa Hokushin Electric Corp Capacity-to-electricity converter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1110943A (en) * 1963-10-01 1968-04-24 Sangamo Weston Improvements in or relating to electrical bridge networks
US3648165A (en) * 1970-09-24 1972-03-07 Sun Oil Co Capacitance-measuring apparatus including means maintaining the voltage across the unknown capacitance constant
US3883812A (en) * 1971-12-20 1975-05-13 Nasa Diode-quad bridge circuit means
US3873917A (en) * 1973-03-24 1975-03-25 Hottinger Messtechnik Baldwin Measuring bridge circuit

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2443054A1 (fr) * 1978-12-01 1980-06-27 Besco Ind Inc Transducteur capacitif de force
EP0018283A1 (fr) * 1979-04-16 1980-10-29 The Bendix Corporation Capteur de pression
EP0105120A2 (fr) * 1982-09-30 1984-04-11 International Business Machines Corporation Procédé et appareil pour mesurer des signaux provenant de capteurs différentiels
EP0105120A3 (en) * 1982-09-30 1987-01-14 International Business Machines Corporation Method and apparatus for measuring signals from differential sensors
FR2632069A1 (fr) * 1988-05-30 1989-12-01 Garcia Manuel Capteur de detection par vitesse de variation d'impedance ou par variation d'impedance
EP0345181A1 (fr) * 1988-05-30 1989-12-06 Manuel Garcia Procédé et dispositif de détection et de reconnaissance d'impact par mesure de variation d'impédance
US4990897A (en) * 1988-05-30 1991-02-05 Manuel J. Garcia Method and apparatus for detecting and recognizing impacts by measuring impedance variation

Also Published As

Publication number Publication date
FR2417887B1 (fr) 1985-06-07
DE2905463C2 (fr) 1989-12-28
JPS54115175A (en) 1979-09-07
JPS6344731Y2 (fr) 1988-11-21
AU521105B2 (en) 1982-03-18
GB2015162B (en) 1982-08-18
IT7920175A0 (it) 1979-02-14
AU4365579A (en) 1979-08-23
DE2905463A1 (de) 1979-08-16
JPS6396415U (fr) 1988-06-22
CA1123225A (fr) 1982-05-11
ES477752A1 (es) 1979-10-16
IT1111910B (it) 1986-01-13
GB2015162A (en) 1979-09-05

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Legal Events

Date Code Title Description
ST Notification of lapse