ZA953346B - Piezoelectric sensing systems - Google Patents
Piezoelectric sensing systemsInfo
- 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
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 Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Measuring Fluid Pressure (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Burglar Alarm Systems (AREA)
- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Geophysics And Detection Of Objects (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
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 (xx) |
JP (1) | JPH11503820A (xx) |
KR (1) | KR970702479A (xx) |
AT (1) | ATE185420T1 (xx) |
AU (1) | AU2313295A (xx) |
CA (1) | CA2188547A1 (xx) |
DE (1) | DE69512652T2 (xx) |
DK (1) | DK0757784T3 (xx) |
ES (1) | ES2138733T3 (xx) |
GB (2) | GB9408176D0 (xx) |
NO (1) | NO964523L (xx) |
WO (1) | WO1995029388A1 (xx) |
ZA (1) | ZA953346B (xx) |
Families Citing this family (14)
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 |
DE19933044B4 (de) * | 1999-07-15 | 2005-09-01 | Siemens Ag | Füllstandsgeber für einen Flüssigkeitsbehälter und Verfahren zur Ermittlung des Füllstandes in einem Flüssigkeitsbehälter |
DE19933043B4 (de) * | 1999-07-15 | 2005-07-28 | Siemens Ag | Füllstandsgeber für einen Flüssigkeitsbehälter und Verfahren zur Ermittlung des Füllstandes in einem Flüssigkeitsbehälter |
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 (de) * | 2008-08-08 | 2010-02-10 | VEGA Grieshaber KG | Verfahren zum Messen eines Füllstands oder Grenzstands, Füllstand- oder Grenzstandmessgeräte-Schaltung und Füllstand- oder Grenzstandmessgerät |
EP2341323A1 (en) * | 2009-12-17 | 2011-07-06 | BAE Systems PLC | Sensors |
WO2011073667A1 (en) * | 2009-12-17 | 2011-06-23 | Bae Systems Plc | Sensors |
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 (en) * | 2016-03-04 | 2017-09-06 | Buira Nunez, Ernest | A detection device, a system and a method for measuring fluid properties including viscosity and/or density |
Family Cites Families (4)
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 |
-
1994
- 1994-04-25 GB GB9408176A patent/GB9408176D0/en active Pending
-
1995
- 1995-04-25 DK DK95916761T patent/DK0757784T3/da active
- 1995-04-25 ES ES95916761T patent/ES2138733T3/es not_active Expired - Lifetime
- 1995-04-25 JP JP7527478A patent/JPH11503820A/ja active Pending
- 1995-04-25 ZA ZA953346A patent/ZA953346B/xx unknown
- 1995-04-25 CA CA002188547A patent/CA2188547A1/en not_active Abandoned
- 1995-04-25 KR KR1019960705954A patent/KR970702479A/ko not_active Application Discontinuation
- 1995-04-25 GB GB9622296A patent/GB2302178B/en not_active Expired - Lifetime
- 1995-04-25 DE DE69512652T patent/DE69512652T2/de not_active Expired - Fee Related
- 1995-04-25 WO PCT/GB1995/000938 patent/WO1995029388A1/en active IP Right Grant
- 1995-04-25 AT AT95916761T patent/ATE185420T1/de not_active IP Right Cessation
- 1995-04-25 AU AU23132/95A patent/AU2313295A/en not_active Abandoned
- 1995-04-25 EP EP95916761A patent/EP0757784B1/en not_active Expired - Lifetime
-
1996
- 1996-10-24 NO NO964523A patent/NO964523L/no not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
GB9408176D0 (en) | 1994-06-15 |
GB9622296D0 (en) | 1996-12-18 |
KR970702479A (ko) | 1997-05-13 |
DE69512652T2 (de) | 2000-04-27 |
GB2302178B (en) | 1998-04-29 |
WO1995029388A1 (en) | 1995-11-02 |
AU2313295A (en) | 1995-11-16 |
NO964523D0 (no) | 1996-10-24 |
GB2302178A (en) | 1997-01-08 |
ATE185420T1 (de) | 1999-10-15 |
NO964523L (no) | 1996-11-14 |
ES2138733T3 (es) | 2000-01-16 |
CA2188547A1 (en) | 1995-11-02 |
EP0757784A1 (en) | 1997-02-12 |
DE69512652D1 (de) | 1999-11-11 |
DK0757784T3 (da) | 2000-03-20 |
EP0757784B1 (en) | 1999-10-06 |
JPH11503820A (ja) | 1999-03-30 |
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