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FR2340542A1 - Temp. and voltage compensated electret sensor - has sensing circuit connected to two conductive layers for specified compensation - Google Patents

Temp. and voltage compensated electret sensor - has sensing circuit connected to two conductive layers for specified compensation

Info

Publication number
FR2340542A1
FR2340542A1 FR7603484A FR7603484A FR2340542A1 FR 2340542 A1 FR2340542 A1 FR 2340542A1 FR 7603484 A FR7603484 A FR 7603484A FR 7603484 A FR7603484 A FR 7603484A FR 2340542 A1 FR2340542 A1 FR 2340542A1
Authority
FR
France
Prior art keywords
layer
electret
sensing circuit
temp
conductive layers
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
FR7603484A
Other languages
French (fr)
Other versions
FR2340542B1 (en
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.)
3M Co
Original Assignee
Minnesota Mining and Manufacturing Co
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 Minnesota Mining and Manufacturing Co filed Critical Minnesota Mining and Manufacturing Co
Priority to FR7603484A priority Critical patent/FR2340542A1/en
Publication of FR2340542A1 publication Critical patent/FR2340542A1/en
Application granted granted Critical
Publication of FR2340542B1 publication Critical patent/FR2340542B1/fr
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/003—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using pyroelectric elements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/10—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors
    • G01J5/34—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors using capacitors, e.g. pyroelectric capacitors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/16—Measuring force or stress, in general using properties of piezoelectric devices
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/30—Piezoelectric or electrostrictive devices with mechanical input and electrical output, e.g. functioning as generators or sensors
    • H10N30/302—Sensors

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Radiation Pyrometers (AREA)

Abstract

The sensor has an electret layer of polarised material with both piezoelectric and pyroelectric properties. The layer generates electrostatic charges of opposite polarity on its surfaces under the effect of temperature and voltage variations. One side of the electret layer is in close planar contact with a conductive layer. A second electret layer of the same properties is arranged parallel to the first layer and has also a second conductive layer. A third conductive layer is sandwiched between the other sides of the two electret layers. An electronic sensing circuit (10) is connected to at least two conductive layers in such manner that, when the electret layers are exposed to identical temperature changes and opposite voltage changes, the circuit picks up the electrostatic charges, while not responding to electrostatic charges due to the other change of the two states.
FR7603484A 1976-02-09 1976-02-09 Temp. and voltage compensated electret sensor - has sensing circuit connected to two conductive layers for specified compensation Granted FR2340542A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7603484A FR2340542A1 (en) 1976-02-09 1976-02-09 Temp. and voltage compensated electret sensor - has sensing circuit connected to two conductive layers for specified compensation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7603484A FR2340542A1 (en) 1976-02-09 1976-02-09 Temp. and voltage compensated electret sensor - has sensing circuit connected to two conductive layers for specified compensation

Publications (2)

Publication Number Publication Date
FR2340542A1 true FR2340542A1 (en) 1977-09-02
FR2340542B1 FR2340542B1 (en) 1980-02-08

Family

ID=9168890

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7603484A Granted FR2340542A1 (en) 1976-02-09 1976-02-09 Temp. and voltage compensated electret sensor - has sensing circuit connected to two conductive layers for specified compensation

Country Status (1)

Country Link
FR (1) FR2340542A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0157730A2 (en) * 1984-04-04 1985-10-09 Universal-Kugellager-Fabrik GmbH Measuring apparatus

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB312509A (en) * 1928-06-12 1929-05-30 Robert Knox Hezlet Improvements in pressure gauges
US2096826A (en) * 1936-02-29 1937-10-26 Rca Corp Piezometer
US3877308A (en) * 1974-01-02 1975-04-15 Minnesota Mining & Mfg Pyroelectric temperature compensated sensing apparatus
FR2298787A1 (en) * 1975-01-22 1976-08-20 Minnesota Mining & Mfg Piezo-electric based weighing appts - comprising polymeric polarised piezo-electric layer sandwiched between conducting plates
FR2301812A1 (en) * 1975-02-18 1976-09-17 Minnesota Mining & Mfg MULTIPLE ELECTRET SENSOR

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB312509A (en) * 1928-06-12 1929-05-30 Robert Knox Hezlet Improvements in pressure gauges
US2096826A (en) * 1936-02-29 1937-10-26 Rca Corp Piezometer
US3877308A (en) * 1974-01-02 1975-04-15 Minnesota Mining & Mfg Pyroelectric temperature compensated sensing apparatus
FR2298787A1 (en) * 1975-01-22 1976-08-20 Minnesota Mining & Mfg Piezo-electric based weighing appts - comprising polymeric polarised piezo-electric layer sandwiched between conducting plates
FR2301812A1 (en) * 1975-02-18 1976-09-17 Minnesota Mining & Mfg MULTIPLE ELECTRET SENSOR

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0157730A2 (en) * 1984-04-04 1985-10-09 Universal-Kugellager-Fabrik GmbH Measuring apparatus
EP0157730A3 (en) * 1984-04-04 1987-04-15 Universal-Kugellager-Fabrik GmbH Measuring apparatus

Also Published As

Publication number Publication date
FR2340542B1 (en) 1980-02-08

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Legal Events

Date Code Title Description
ST Notification of lapse