GB1512233A - Piezoelectric presence sensitive apparatus - Google Patents

Piezoelectric presence sensitive apparatus

Info

Publication number
GB1512233A
GB1512233A GB1102475A GB1102475A GB1512233A GB 1512233 A GB1512233 A GB 1512233A GB 1102475 A GB1102475 A GB 1102475A GB 1102475 A GB1102475 A GB 1102475A GB 1512233 A GB1512233 A GB 1512233A
Authority
GB
United Kingdom
Prior art keywords
tubular body
circuit
level
oscillator
march
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.)
Expired
Application number
GB1102475A
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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
Priority claimed from JP3251274U external-priority patent/JPS557861Y2/ja
Priority claimed from JP1974032513U external-priority patent/JPS5535529Y2/ja
Priority claimed from JP3251174U external-priority patent/JPS50122259U/ja
Priority claimed from JP49057170A external-priority patent/JPS50149370A/ja
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Publication of GB1512233A publication Critical patent/GB1512233A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/296—Acoustic waves
    • G01F23/2966—Acoustic waves making use of acoustical resonance or standing waves
    • G01F23/2967—Acoustic waves making use of acoustical resonance or standing waves for discrete levels
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/14—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measurement of pressure
    • G01F23/18—Indicating, recording or alarm devices actuated electrically
    • 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
    • G01L9/08—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 piezoelectric devices, i.e. electric circuits therefor

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Acoustics & Sound (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

1512233 Level sensing MATSUSHITA ELECTRIC INDUSTRIAL CO Ltd 17 March 1975 [20 March 1974 (3) 20 May 1974] 11024/75 Heading G1G [Also in Division H4] Apparatus for sensing the level of liquid or fluent solid material in a container includes a Piezoelectric element 3 bonded to a tubular body arranged to contact the material, an oscillator circuit E of which the Piezo-electric element is part, and a circuit F, G, H for detecting a change in the oscillator output due to a change in the impedance of element 3 dependent on damping of the vibrations of the tubular body by the material. For the embodiment shown, lamp H is turned off when the level of engine oil is sufficient to contact the tubular body, since circuit E stops oscillating. A negative temperature coefficient thermistor 17 also stops the oscillator when the oil temperature is so low that the oil gels. Details of alternative probes, each comprising a flexure mode element 3, with or without the thermistor 17, within a tubular body, are given, Figs. 1, 12, 13, 14 and 18 (not shown).
GB1102475A 1974-03-20 1975-03-17 Piezoelectric presence sensitive apparatus Expired GB1512233A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP3251274U JPS557861Y2 (en) 1974-03-20 1974-03-20
JP1974032513U JPS5535529Y2 (en) 1974-03-20 1974-03-20
JP3251174U JPS50122259U (en) 1974-03-20 1974-03-20
JP49057170A JPS50149370A (en) 1974-05-20 1974-05-20

Publications (1)

Publication Number Publication Date
GB1512233A true GB1512233A (en) 1978-05-24

Family

ID=27459632

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1102475A Expired GB1512233A (en) 1974-03-20 1975-03-17 Piezoelectric presence sensitive apparatus

Country Status (4)

Country Link
DE (1) DE2512060B2 (en)
FR (1) FR2265084B1 (en)
GB (1) GB1512233A (en)
IT (1) IT1032358B (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2436372A1 (en) * 1978-09-13 1980-04-11 Cit Alcatel Level monitoring device for fluid and powder hoppers - uses current drawn by ultrasonic transducers to control indicator lights
GB2152665A (en) * 1984-01-03 1985-08-07 Ae Cds Autoclave Inc Liquid level detection
EP0229225A2 (en) * 1985-12-10 1987-07-22 VDO Adolf Schindling AG Device for measuring the level in a container
GB2321107A (en) * 1997-01-14 1998-07-15 Smiths Industries Plc Fluid level detector
EP0985916A1 (en) * 1998-09-09 2000-03-15 Endress + Hauser GmbH + Co. Device for detecting and/or monitoring a predetermined level in a container
US6236322B1 (en) 1998-09-09 2001-05-22 Endress + Hauser Gmbh + Co. Apparatus for establishing and/or monitoring a predetermined filling level in a container
EP1239267A2 (en) * 2001-03-07 2002-09-11 Starr Johnson Liquid level measurement by magnetic excitation and vibration sensing

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3215040C2 (en) * 1982-04-22 1985-11-07 VEGA Grieshaber -GmbH & Co, 7622 Schiltach Resonance rod
US4570482A (en) * 1982-04-23 1986-02-18 Murata Manufacturing Co., Ltd. Load-sensitive level detecting device
DE3312652A1 (en) * 1983-04-08 1984-10-11 Flutec Fluidtechnische Geräte GmbH, 6603 Sulzbach DEVICE FOR MEASURING THE LEVEL AND THE TEMPERATURE OF THE FILLAGE IN A CONTAINER
DE3314872A1 (en) * 1983-04-25 1984-10-25 Vdo Adolf Schindling Ag, 6000 Frankfurt DEVICE FOR DETECTING THE LEVEL AT THE SITE OF A SENSOR
US4740726A (en) * 1986-07-21 1988-04-26 Nohken Inc. Vibrator-type level sensor
DE3640444C2 (en) * 1986-11-27 1996-11-07 Vdo Schindling Device for detecting the level in a container
DE3640443C2 (en) * 1986-11-27 1995-06-01 Vdo Schindling Device for detecting the level in a container
DE3810670C2 (en) * 1988-03-29 1998-11-26 Siemens Ag Device for level monitoring
DE4316148A1 (en) * 1993-05-15 1994-11-17 Hahn Schickard Ges Sensor for measuring the filling level of fluids
DE10131081A1 (en) * 2001-06-27 2003-01-09 Endress & Hauser Gmbh & Co Kg Device for determining and / or monitoring the fill level of a medium in a container
DE10138360A1 (en) * 2001-08-04 2003-02-27 Daimler Chrysler Ag Fuel tank filling level measuring system uses mechanical resonator elements provided by part of outside wall of housing immersed in liquid in tank
DE102010038535A1 (en) 2010-07-28 2012-02-02 Endress + Hauser Gmbh + Co. Kg Device for determining and / or monitoring a predetermined fill level
DE102011090014A1 (en) * 2011-12-28 2013-07-04 Endress + Hauser Gmbh + Co. Kg Device for determining and / or monitoring at least one process variable
DE102019210901A1 (en) * 2019-07-23 2021-01-28 Robert Bosch Gmbh Sensor device and tank device for motor vehicles

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2436372A1 (en) * 1978-09-13 1980-04-11 Cit Alcatel Level monitoring device for fluid and powder hoppers - uses current drawn by ultrasonic transducers to control indicator lights
GB2152665A (en) * 1984-01-03 1985-08-07 Ae Cds Autoclave Inc Liquid level detection
EP0229225A2 (en) * 1985-12-10 1987-07-22 VDO Adolf Schindling AG Device for measuring the level in a container
EP0229225A3 (en) * 1985-12-10 1989-04-26 Vdo Adolf Schindling Ag Device for measuring the level in a container
GB2321107A (en) * 1997-01-14 1998-07-15 Smiths Industries Plc Fluid level detector
EP0985916A1 (en) * 1998-09-09 2000-03-15 Endress + Hauser GmbH + Co. Device for detecting and/or monitoring a predetermined level in a container
US6236322B1 (en) 1998-09-09 2001-05-22 Endress + Hauser Gmbh + Co. Apparatus for establishing and/or monitoring a predetermined filling level in a container
EP1239267A2 (en) * 2001-03-07 2002-09-11 Starr Johnson Liquid level measurement by magnetic excitation and vibration sensing
EP1239267A3 (en) * 2001-03-07 2003-10-15 Starr Johnson Liquid level measurement by magnetic excitation and vibration sensing

Also Published As

Publication number Publication date
FR2265084A1 (en) 1975-10-17
IT1032358B (en) 1979-05-30
DE2512060A1 (en) 1975-12-04
DE2512060B2 (en) 1978-06-15
FR2265084B1 (en) 1980-03-14

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19940317