WO1999057526A3 - Ultrasonic transducer - Google Patents

Ultrasonic transducer Download PDF

Info

Publication number
WO1999057526A3
WO1999057526A3 PCT/DE1999/001402 DE9901402W WO9957526A3 WO 1999057526 A3 WO1999057526 A3 WO 1999057526A3 DE 9901402 W DE9901402 W DE 9901402W WO 9957526 A3 WO9957526 A3 WO 9957526A3
Authority
WO
WIPO (PCT)
Prior art keywords
ultrasonic transducer
measured
coupling layer
manner
piezoelectric wafer
Prior art date
Application number
PCT/DE1999/001402
Other languages
German (de)
French (fr)
Other versions
WO1999057526A2 (en
Inventor
Thomas Hahn
Matthias Molitor
Thomas Trautmann
Original Assignee
Fraunhofer Ges Forschung
Thomas Hahn
Matthias Molitor
Thomas Trautmann
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 Fraunhofer Ges Forschung, Thomas Hahn, Matthias Molitor, Thomas Trautmann filed Critical Fraunhofer Ges Forschung
Priority to EP99932668A priority Critical patent/EP1080345A2/en
Publication of WO1999057526A2 publication Critical patent/WO1999057526A2/en
Publication of WO1999057526A3 publication Critical patent/WO1999057526A3/en

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
    • G01F23/2968—Transducers specially adapted for acoustic level indicators
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/02—Mechanical acoustic impedances; Impedance matching, e.g. by horns; Acoustic resonators

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

The invention relates to an ultrasonic transducer which can, for example, be used in level measuring devices for measuring the level of a liquid in open or closed receptacles. The inventive ultrasonic transducer comprises a piezoelectric wafer (2) which is situated in a retaining device (3). A coupling layer (1) for ultrasound is applied, e.g. cast, in a fixed manner to the fore-side (radiating ) surface of the piezoelectric wafer (2). This coupling layer (1) is comprised of an elastic material whose elasticity enables the coupling layer to adapt to a surface of an object to be measured when the ultrasonic transducer is pressed against the surface of said object to be measured. In an advantageous manner, the inventive ultrasonic transducer permits an acoustic coupling to objects to be measured which does not require the use of auxiliary materials and which can be changed in any manner.
PCT/DE1999/001402 1998-05-07 1999-05-06 Ultrasonic transducer WO1999057526A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP99932668A EP1080345A2 (en) 1998-05-07 1999-05-06 Ultrasonic transducer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19820419.1 1998-05-07
DE19820419A DE19820419A1 (en) 1998-05-07 1998-05-07 Ultrasonic transducer

Publications (2)

Publication Number Publication Date
WO1999057526A2 WO1999057526A2 (en) 1999-11-11
WO1999057526A3 true WO1999057526A3 (en) 2000-03-16

Family

ID=7866974

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1999/001402 WO1999057526A2 (en) 1998-05-07 1999-05-06 Ultrasonic transducer

Country Status (3)

Country Link
EP (1) EP1080345A2 (en)
DE (1) DE19820419A1 (en)
WO (1) WO1999057526A2 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10344741A1 (en) * 2003-09-25 2005-04-14 Endress + Hauser Gmbh + Co. Kg Sound or ultrasonic transducer
US8104341B2 (en) * 2009-03-25 2012-01-31 Schmitt Measurement Systems, Inc. Ultrasonic liquid level monitoring system
DE102012104227A1 (en) * 2012-05-15 2013-11-21 Endress + Hauser Gmbh + Co. Kg Ultrasonic transducer has attenuation capping portion that is interlaced with metal or metal oxide particles at room temperature, such that cross-linking encapsulation is conditioned with micro hollow spheres
DE102012209777A1 (en) * 2012-06-12 2013-12-12 Continental Automotive Gmbh Coupling device for coupling sound converter of acoustic measuring device with fluid conduit or fluid reservoir, comprises acoustic coupling layer firmly coupled with housing element of sound converter by injection molding
DE102018216624B4 (en) * 2018-09-27 2022-12-08 Vitesco Technologies Germany Gmbh Method and device for determining the filling level and/or the quality of a fluid in a fluid container
CN115568905A (en) * 2022-10-17 2023-01-06 深圳迈菲超声医疗器械有限公司 Ultrasonic cutting device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2934031B1 (en) * 1979-08-02 1980-10-09 Landis & Gyr Ag Ultrasonic transducer
US4570482A (en) * 1982-04-23 1986-02-18 Murata Manufacturing Co., Ltd. Load-sensitive level detecting device
US4703652A (en) * 1984-12-01 1987-11-03 Ngk Spark Plug Co., Ltd. Piezoelectric type liquid level sensor and fabricating method thereof
US4780861A (en) * 1984-12-20 1988-10-25 The Coca-Cola Company Automatic control system for filling beverage containers
WO1994004265A1 (en) * 1992-08-18 1994-03-03 Reson System A/S Transducer with high effective membrane of cavitation

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07119799B2 (en) * 1987-08-07 1995-12-20 松下電工株式会社 Ultrasonic transducer
CH689125A5 (en) * 1993-09-02 1998-10-15 Kk Holding Ag Acoustic emission.
DE19538696C2 (en) * 1995-10-17 1997-09-25 Endress Hauser Gmbh Co Arrangement for monitoring a predetermined fill level of a liquid in a container

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2934031B1 (en) * 1979-08-02 1980-10-09 Landis & Gyr Ag Ultrasonic transducer
US4570482A (en) * 1982-04-23 1986-02-18 Murata Manufacturing Co., Ltd. Load-sensitive level detecting device
US4703652A (en) * 1984-12-01 1987-11-03 Ngk Spark Plug Co., Ltd. Piezoelectric type liquid level sensor and fabricating method thereof
US4780861A (en) * 1984-12-20 1988-10-25 The Coca-Cola Company Automatic control system for filling beverage containers
WO1994004265A1 (en) * 1992-08-18 1994-03-03 Reson System A/S Transducer with high effective membrane of cavitation

Also Published As

Publication number Publication date
WO1999057526A2 (en) 1999-11-11
EP1080345A2 (en) 2001-03-07
DE19820419A1 (en) 1999-11-18

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