ZA953346B - Piezoelectric sensing systems - Google Patents

Piezoelectric sensing systems

Info

Publication number
ZA953346B
ZA953346B ZA953346A ZA953346A ZA953346B ZA 953346 B ZA953346 B ZA 953346B ZA 953346 A ZA953346 A ZA 953346A ZA 953346 A ZA953346 A ZA 953346A ZA 953346 B ZA953346 B ZA 953346B
Authority
ZA
South Africa
Prior art keywords
piezoelectric sensing
sensing systems
sensing element
resonant frequency
piezoelectric
Prior art date
Application number
ZA953346A
Other languages
English (en)
Inventor
Ian Casselden
Original Assignee
Ar Met Plastics Limited
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 Ar Met Plastics Limited filed Critical Ar Met Plastics Limited
Publication of ZA953346B publication Critical patent/ZA953346B/xx

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
    • G01F23/22—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
    • 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
    • G01F23/2968—Transducers specially adapted for acoustic level indicators
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/02—Analysing fluids
    • G01N29/036—Analysing fluids by measuring frequency or resonance of acoustic waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/028—Material parameters
    • G01N2291/02836—Flow rate, liquid level

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Immunology (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Pathology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Measuring Fluid Pressure (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Burglar Alarm Systems (AREA)
ZA953346A 1994-04-25 1995-04-25 Piezoelectric sensing systems ZA953346B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9408176A GB9408176D0 (en) 1994-04-25 1994-04-25 Fluid level detectors

Publications (1)

Publication Number Publication Date
ZA953346B true ZA953346B (en) 1996-01-11

Family

ID=10754082

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA953346A ZA953346B (en) 1994-04-25 1995-04-25 Piezoelectric sensing systems

Country Status (13)

Country Link
EP (1) EP0757784B1 (fr)
JP (1) JPH11503820A (fr)
KR (1) KR970702479A (fr)
AT (1) ATE185420T1 (fr)
AU (1) AU2313295A (fr)
CA (1) CA2188547A1 (fr)
DE (1) DE69512652T2 (fr)
DK (1) DK0757784T3 (fr)
ES (1) ES2138733T3 (fr)
GB (2) GB9408176D0 (fr)
NO (1) NO964523L (fr)
WO (1) WO1995029388A1 (fr)
ZA (1) ZA953346B (fr)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6044694A (en) * 1996-08-28 2000-04-04 Videojet Systems International, Inc. Resonator sensors employing piezoelectric benders for fluid property sensing
DE19720519C2 (de) * 1997-05-16 2000-03-30 Pepperl & Fuchs Vorrichtung zur Feststellung und/oder Überwachung eines Füllstandes eines Mediums in einem Behälter
US6799820B1 (en) 1999-05-20 2004-10-05 Seiko Epson Corporation Liquid container having a liquid detecting device
DE19933043B4 (de) * 1999-07-15 2005-07-28 Siemens Ag Füllstandsgeber für einen Flüssigkeitsbehälter und Verfahren zur Ermittlung des Füllstandes in einem Flüssigkeitsbehälter
DE19933044B4 (de) * 1999-07-15 2005-09-01 Siemens Ag Füllstandsgeber für einen Flüssigkeitsbehälter und Verfahren zur Ermittlung des Füllstandes in einem Flüssigkeitsbehälter
US7225670B2 (en) 2000-05-18 2007-06-05 Seiko Epson Corporation Mounting structure, module, and liquid container
DE10153937A1 (de) * 2001-03-28 2003-02-27 Endress & Hauser Gmbh & Co Kg Vorrichtung zur Feststellung und/oder Überwachung eines vorbestimmten Füllstandes in einem Behälter
US6938475B2 (en) 2001-03-28 2005-09-06 Endress + Hauser Gmbh + Co. Kg Device for establishing and/or monitoring a predetermined fill level in a container
DE10203461A1 (de) * 2002-01-28 2003-08-14 Grieshaber Vega Kg Schwingungsgrenzstandsensor
DE10350331B4 (de) * 2003-10-29 2006-11-09 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Schaltungsanordnung und Verfahren zur Ausgabe von Analogsignalen durch einen Mikroprozessor
EP2151672A1 (fr) * 2008-08-08 2010-02-10 VEGA Grieshaber KG Procédé de mesure d'un niveau de remplissage ou d'un niveau limite, commutation d'appareils de mesure du niveau de remplissage ou de niveau limite et appareil de mesure de niveau de remplissage ou de niveau limite
EP2513614A1 (fr) * 2009-12-17 2012-10-24 BAE Systems Plc. Capteurs
EP2341323A1 (fr) * 2009-12-17 2011-07-06 BAE Systems PLC Capteurs
US9179843B2 (en) 2011-04-21 2015-11-10 Hassan Ghaderi MOGHADDAM Method and system for optically evaluating proximity to the inferior alveolar nerve in situ
DE102011075113A1 (de) * 2011-05-03 2012-11-08 Endress + Hauser Gmbh + Co. Kg Vorrichtung und Verfahren zum Betreiben einer Vorrichtung zur Bestimmung und/oder Überwachung mindestens einer physikalischen Prozessgröße
EP3214424A1 (fr) * 2016-03-04 2017-09-06 Buira Nunez, Ernest Dispositif de détection, système et procédé permettant de mesurer les propriétés d'un fluide comprenant la viscosité et/ou densité

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2632632A1 (de) * 1976-07-20 1978-01-26 Ici Ltd Verfahren und geraet zur ueberwachung von parametern
FR2436372A1 (fr) * 1978-09-13 1980-04-11 Cit Alcatel Dispositif de controle du niveau d'un materiau fluide contenu dans un reservoir vertical
DE3314872A1 (de) * 1983-04-25 1984-10-25 Vdo Adolf Schindling Ag, 6000 Frankfurt Einrichtung zur meldung des fuellstandes an dem ort eines sensors
US5428997A (en) * 1992-07-20 1995-07-04 Pasteur Sanofi Diagnostics Method of and device for fluid surface detection using an ultrasonic transducer

Also Published As

Publication number Publication date
DE69512652D1 (de) 1999-11-11
EP0757784B1 (fr) 1999-10-06
NO964523L (no) 1996-11-14
ATE185420T1 (de) 1999-10-15
GB9408176D0 (en) 1994-06-15
KR970702479A (ko) 1997-05-13
GB2302178B (en) 1998-04-29
EP0757784A1 (fr) 1997-02-12
NO964523D0 (no) 1996-10-24
GB9622296D0 (en) 1996-12-18
DE69512652T2 (de) 2000-04-27
JPH11503820A (ja) 1999-03-30
ES2138733T3 (es) 2000-01-16
AU2313295A (en) 1995-11-16
GB2302178A (en) 1997-01-08
WO1995029388A1 (fr) 1995-11-02
DK0757784T3 (da) 2000-03-20
CA2188547A1 (fr) 1995-11-02

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