EP0615471A1 - Transducteur sonore ou ultrasonore. - Google Patents

Transducteur sonore ou ultrasonore.

Info

Publication number
EP0615471A1
EP0615471A1 EP93920823A EP93920823A EP0615471A1 EP 0615471 A1 EP0615471 A1 EP 0615471A1 EP 93920823 A EP93920823 A EP 93920823A EP 93920823 A EP93920823 A EP 93920823A EP 0615471 A1 EP0615471 A1 EP 0615471A1
Authority
EP
European Patent Office
Prior art keywords
metal ring
radial
piezoceramic disk
piezoceramic
ultrasonic transducer
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
EP93920823A
Other languages
German (de)
English (en)
Other versions
EP0615471B1 (fr
Inventor
Karl Floegel
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.)
Endress and Hauser SE and Co KG
Original Assignee
Endress and Hauser SE and Co KG
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 Endress and Hauser SE and Co KG filed Critical Endress and Hauser SE and Co KG
Publication of EP0615471A1 publication Critical patent/EP0615471A1/fr
Application granted granted Critical
Publication of EP0615471B1 publication Critical patent/EP0615471B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
    • B06B1/0644—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using a single piezoelectric element
    • B06B1/0655—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using a single piezoelectric element of cylindrical shape
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers

Definitions

  • the invention relates to a sound or ultrasound transducer with a round piezoceramic disk which can be excited to radial vibrations and with a metal ring surrounding the piezoceramic disk.
  • the operating frequency is usually the radial resonance frequency of the piezoceramic disk, which is determined by the dimensions of the piezoceramic disk.
  • the diameter of the piezoceramic disc also determines the size of the sound radiation area, which is decisive for the opening angle of the generated sound beam.
  • a foam plate serving as an adaptation layer is glued onto one end face of the piezoceramic disc and has a substantially larger area dimension than that Piezoceramic disc has.
  • the protruding area of the foam sheet is connected to the metal ring surrounding the piezoceramic disk, which serves as a weighting ring, so that the interface between the weighting ring and the piezoceramic disk represents a node area which remains almost at rest during operation of the ultrasound transducer. This ensures that the full size of the free end face of the matching layer vibrates almost in phase.
  • the metal ring In order for the metal ring to have this effect of a weighting ring, it must not touch the piezoceramic disk.
  • the sound radiation area is enlarged compared to the area of the piezoceramic disk, but the operating frequency is still determined by the diameter of the piezoceramic disk. A reduction in the operating frequency can only be achieved by using a larger piezoceramic disc.
  • the object of the invention is to create a sound or ultrasound transducer of the type specified at the outset, which, given the dimensions of the piezoceramic disk, has an operating frequency which is reduced compared to the radial resonance frequency of the piezoceramic disk.
  • the metal ring surrounds the outer surface of the piezoceramic disk in a positive and non-positive manner so that it forms a radial oscillator with it.
  • the metal ring is firmly coupled to the piezoceramic disk for radial vibrations, so that the two parts form a mass-spring element which vibrates together in radial vibrations.
  • the total area of the radial oscillator thus formed acts as a radiation surface which oscillates completely in phase with an essentially Gaussian distribution of amplitudes, so that a small opening angle of the sound beam is achieved without disturbing side lobes.
  • the radial resonance frequency of this radial oscillator is lower than the radial resonance frequency of the piezoceramic disk; it is from the dimensions of the metal ring. It is therefore possible to manufacture sound or ultrasonic transducers with different operating frequencies by appropriate dimensioning of the metal ring using the same piezoceramic disks.
  • the metal ring is preferably connected to the piezoceramic disk by shrinking on.
  • a matching layer can be applied to one end face of the radial oscillator formed by the piezoceramic disk and the metal ring.
  • FIG. 2 shows the amplitude distribution over the radiation surface of the sound or ultrasound transducer from FIG. 1,
  • Fig. 3 shows the frequency characteristic of the piezoceramic disk of the sound or ultrasonic transducer of Fig. 1 and
  • FIG. 4 shows the frequency characteristic of the entire sound or ultrasound transducer from FIG. 1.
  • the acoustic or ultrasonic transducer shown in FIG. 1 consists of a round piezoceramic disk 10, on the two end faces of which metal electrodes 12, 14 are attached.
  • the piezoceramic disk 10 is surrounded by a metal ring 16 which is in a non-positive and positive connection with the outer surface of the piezoceramic disk.
  • the metal ring 16 can be connected to the piezoceramic disk 10, for example by shrinking, that is to say that it is placed around the piezoceramic disk in the heated state and when it cools down Piezoceramic disk tightly encloses.
  • the metal ring 16 consists, for example, of aluminum.
  • FIG. 2 shows the amplitude distribution of the vibrations over the entire surface of the radial oscillator consisting of the piezoceramic disk 10 and the metal ring 16.
  • the amplitude distribution largely corresponds to the desired Gaussian distribution.
  • the vibrations are in phase over the entire surface, so that a radiation diagram without disturbing side lobes is obtained, the opening angle of which is determined by the total area of the radial oscillator.
  • FIG. 3 shows the frequency characteristic of the piezoceramic disk 10, the radial resonance frequency being designated f. 4 shows on the same scale the frequency characteristic of the radial oscillator formed from the piezoceramic disk 10 and the metal ring 16. It can be seen that this radial oscillator has essentially the same frequency behavior as the piezoceramic disk 10, but the radial resonance frequency is considerably lower; it lies between the radial resonance frequency of the piezoceramic disk 10 and the radial resonance frequency of the metal ring 16. By appropriately dimensioning the metal ring 16, it is therefore possible to set a desired lower radial resonance frequency using the same piezoceramic disk 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Mechanical Engineering (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

Le transducteur sonore ou ultrasonore décrit contient un disque piézocéramique (10) qui peut être excité pour osciller radialement, ainsi qu'une bague métallique (16) qui entoure la paroi latérale de ce disque rond (10) à laquelle elle est reliée par liaison de forme et de force de façon à constituer avec ce dernier un oscillateur radial. Le transducteur sonore ou ultrasonore qui en résulte a une surface de réflexion correspondant à la surface totale du disque piézocéramique et de la bague métallique et une fréquence de résonance radiale inférieure à la fréquence de résonance radiale du disque piézocéramique.
EP93920823A 1992-10-02 1993-09-24 Transducteur sonore ou ultrasonore Expired - Lifetime EP0615471B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4233256A DE4233256C1 (de) 1992-10-02 1992-10-02 Schall- oder Ultraschallwandler
DE4233256 1992-10-02
PCT/EP1993/002605 WO1994007615A1 (fr) 1992-10-02 1993-09-24 Transducteur sonore ou ultrasonore

Publications (2)

Publication Number Publication Date
EP0615471A1 true EP0615471A1 (fr) 1994-09-21
EP0615471B1 EP0615471B1 (fr) 1995-08-16

Family

ID=6469538

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93920823A Expired - Lifetime EP0615471B1 (fr) 1992-10-02 1993-09-24 Transducteur sonore ou ultrasonore

Country Status (10)

Country Link
US (1) US5583293A (fr)
EP (1) EP0615471B1 (fr)
JP (1) JP2798501B2 (fr)
AU (1) AU664645B2 (fr)
CA (1) CA2124952C (fr)
DE (1) DE4233256C1 (fr)
DK (1) DK0615471T3 (fr)
ES (1) ES2075778T3 (fr)
WO (1) WO1994007615A1 (fr)
ZA (1) ZA937293B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5940468A (en) * 1996-11-08 1999-08-17 American Science And Engineering, Inc. Coded aperture X-ray imaging system

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19527018C1 (de) * 1995-07-24 1997-02-20 Siemens Ag Ultraschallwandler
DE19623071C2 (de) * 1996-06-10 1998-07-09 Siemens Ag Ultraschallwandler
US6113546A (en) * 1998-07-31 2000-09-05 Scimed Life Systems, Inc. Off-aperture electrical connection for ultrasonic transducer
US6406433B1 (en) 1999-07-21 2002-06-18 Scimed Life Systems, Inc. Off-aperture electrical connect transducer and methods of making
DE10344741A1 (de) * 2003-09-25 2005-04-14 Endress + Hauser Gmbh + Co. Kg Schall- oder Ultraschallwandler
US7460435B2 (en) * 2004-01-08 2008-12-02 Schlumberger Technology Corporation Acoustic transducers for tubulars
US7364007B2 (en) * 2004-01-08 2008-04-29 Schlumberger Technology Corporation Integrated acoustic transducer assembly
US7367392B2 (en) * 2004-01-08 2008-05-06 Schlumberger Technology Corporation Wellbore apparatus with sliding shields
US10355623B1 (en) 2006-12-07 2019-07-16 Dmitriy Yavid Generator employing piezolectric and resonating elements with synchronized heat delivery
US7696673B1 (en) 2006-12-07 2010-04-13 Dmitriy Yavid Piezoelectric generators, motor and transformers
US9590534B1 (en) 2006-12-07 2017-03-07 Dmitriy Yavid Generator employing piezoelectric and resonating elements
US11474079B2 (en) 2020-05-04 2022-10-18 Saudi Arabian Oil Company Ultrasonic dry coupled wheel probe with a radial transducer

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1865858A (en) * 1929-04-29 1932-07-05 Hund August Piezo electric crystal system
US2808524A (en) * 1952-03-20 1957-10-01 Sylvania Electric Prod Inertia responsive electro-mechanical transducer
US3360665A (en) * 1965-04-15 1967-12-26 Clevite Corp Prestressed piezoelectric transducer
NL6617756A (fr) * 1966-12-17 1968-06-18
DE2541492C3 (de) * 1975-09-17 1980-10-09 Siemens Ag, 1000 Berlin Und 8000 Muenchen Ultraschallwandler
US4433399A (en) * 1979-07-05 1984-02-21 The Stoneleigh Trust Ultrasonic transducers
AT382262B (de) * 1982-04-16 1987-02-10 Ki Polt I Piezoelektrischer motor
AU544464B2 (en) * 1982-12-27 1985-05-30 Tokyo Shibaura Denki Kabushiki Kaisha Ultrasonic transducer
US4868446A (en) * 1987-01-22 1989-09-19 Hitachi Maxell, Ltd. Piezoelectric revolving resonator and ultrasonic motor
DE4028315A1 (de) * 1990-09-06 1992-03-12 Siemens Ag Ultraschallwandler fuer die laufzeitmessung von ultraschall-impulsen in einem gas
JPH0567819A (ja) * 1991-09-10 1993-03-19 Nec Corp 圧電セラミツクトランス

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9407615A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5940468A (en) * 1996-11-08 1999-08-17 American Science And Engineering, Inc. Coded aperture X-ray imaging system

Also Published As

Publication number Publication date
DE4233256C1 (de) 1993-12-02
AU664645B2 (en) 1995-11-23
ES2075778T3 (es) 1995-10-01
JP2798501B2 (ja) 1998-09-17
DK0615471T3 (da) 1995-09-25
WO1994007615A1 (fr) 1994-04-14
ZA937293B (en) 1994-04-25
JPH06511131A (ja) 1994-12-08
EP0615471B1 (fr) 1995-08-16
AU4819393A (en) 1994-04-26
CA2124952C (fr) 1998-04-28
US5583293A (en) 1996-12-10
CA2124952A1 (fr) 1994-04-14

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