EP0615471B1 - Schall- oder ultraschallwandler - Google Patents
Schall- oder ultraschallwandler Download PDFInfo
- Publication number
- EP0615471B1 EP0615471B1 EP93920823A EP93920823A EP0615471B1 EP 0615471 B1 EP0615471 B1 EP 0615471B1 EP 93920823 A EP93920823 A EP 93920823A EP 93920823 A EP93920823 A EP 93920823A EP 0615471 B1 EP0615471 B1 EP 0615471B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- metal ring
- ultrasonic transducer
- radial
- sonic
- piezoceramic
- 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 - Lifetime
Links
- 229910052751 metal Inorganic materials 0.000 claims abstract description 28
- 239000002184 metal Substances 0.000 claims abstract description 28
- 230000010355 oscillation Effects 0.000 claims abstract 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 239000000919 ceramic Substances 0.000 claims 5
- 230000003044 adaptive effect Effects 0.000 claims 1
- 239000004411 aluminium Substances 0.000 claims 1
- 238000002604 ultrasonography Methods 0.000 description 8
- 230000005855 radiation Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
Images
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 a matching layer is glued onto the end face of the piezoceramic disc and has a substantially larger surface area than the piezoceramic disc.
- 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. It is thereby achieved that the free end face of the matching layer vibrates almost in phase in its full size.
- the metal ring In order for the metal ring to have this effect of a weighting ring, it must not touch the piezoceramic disc.
- 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. The operating frequency can only be reduced by using a larger piezoceramic disc.
- the object of the invention is to provide a sound or ultrasound transducer of the type specified at the outset, which, given the dimensions of the piezoceramic disk, has an operating frequency that is lower than 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 that 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 produce sound or ultrasonic transducers with different operating frequencies by appropriately dimensioning 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.
- 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 shrink-fitting, 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 is made of aluminum, for example.
- the piezoceramic disk 10 If an alternating voltage is applied to the electrodes 12 and 14, the piezoceramic disk 10 is excited to radial vibrations. As a result of the close coupling with the metal ring 16, these radial vibrations are transmitted to the metal ring, so that the entire structure behaves like a single radial oscillator.
- an adaptation layer 18 applied to the one end face of the piezoceramic disk 10 and the metal ring 16 the thickness of which corresponds to a quarter wavelength of the generated sound or ultrasound wave, it is achieved that the generated sound or ultrasound wave is emitted essentially only on this side.
- 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 R. 4 shows the frequency characteristic of the radial oscillator formed from the piezoceramic disk 10 and the metal ring 16 on the same scale. It can be seen that this radial oscillator has essentially the same frequency response as the piezoceramic disk 10, but the radial resonance frequency is significantly 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.
- FIGS. 2, 3 and 4 show that the radial oscillator consisting of the piezoceramic disk 10 and the metal ring 16 behaves like a piezoceramic disk with respect to amplitude distribution, phase distribution and frequency, which has a larger diameter than the 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)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4233256 | 1992-10-02 | ||
DE4233256A DE4233256C1 (de) | 1992-10-02 | 1992-10-02 | Schall- oder Ultraschallwandler |
PCT/EP1993/002605 WO1994007615A1 (de) | 1992-10-02 | 1993-09-24 | Schall- oder ultraschallwandler |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0615471A1 EP0615471A1 (de) | 1994-09-21 |
EP0615471B1 true EP0615471B1 (de) | 1995-08-16 |
Family
ID=6469538
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93920823A Expired - Lifetime EP0615471B1 (de) | 1992-10-02 | 1993-09-24 | Schall- oder ultraschallwandler |
Country Status (10)
Country | Link |
---|---|
US (1) | US5583293A (da) |
EP (1) | EP0615471B1 (da) |
JP (1) | JP2798501B2 (da) |
AU (1) | AU664645B2 (da) |
CA (1) | CA2124952C (da) |
DE (1) | DE4233256C1 (da) |
DK (1) | DK0615471T3 (da) |
ES (1) | ES2075778T3 (da) |
WO (1) | WO1994007615A1 (da) |
ZA (1) | ZA937293B (da) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7411335B2 (en) | 2003-09-25 | 2008-08-12 | Endress + Hauser Gmbh + Co. Kg | Sonic or ultrasonic transducer |
Families Citing this family (12)
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 |
US5940468A (en) * | 1996-11-08 | 1999-08-17 | American Science And Engineering, Inc. | Coded aperture X-ray imaging system |
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 |
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 |
US9590534B1 (en) | 2006-12-07 | 2017-03-07 | Dmitriy Yavid | Generator employing piezoelectric and resonating elements |
US7696673B1 (en) | 2006-12-07 | 2010-04-13 | Dmitriy Yavid | Piezoelectric generators, motor and transformers |
US10355623B1 (en) | 2006-12-07 | 2019-07-16 | Dmitriy Yavid | Generator employing piezolectric and resonating elements with synchronized heat delivery |
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)
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 (da) * | 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 |
-
1992
- 1992-10-02 DE DE4233256A patent/DE4233256C1/de not_active Expired - Fee Related
-
1993
- 1993-09-24 ES ES93920823T patent/ES2075778T3/es not_active Expired - Lifetime
- 1993-09-24 DK DK93920823.7T patent/DK0615471T3/da active
- 1993-09-24 JP JP6508675A patent/JP2798501B2/ja not_active Expired - Fee Related
- 1993-09-24 WO PCT/EP1993/002605 patent/WO1994007615A1/de active IP Right Grant
- 1993-09-24 US US08/244,595 patent/US5583293A/en not_active Expired - Fee Related
- 1993-09-24 AU AU48193/93A patent/AU664645B2/en not_active Ceased
- 1993-09-24 EP EP93920823A patent/EP0615471B1/de not_active Expired - Lifetime
- 1993-09-24 CA CA002124952A patent/CA2124952C/en not_active Expired - Fee Related
- 1993-10-01 ZA ZA937293A patent/ZA937293B/xx unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7411335B2 (en) | 2003-09-25 | 2008-08-12 | Endress + Hauser Gmbh + Co. Kg | Sonic or ultrasonic transducer |
Also Published As
Publication number | Publication date |
---|---|
DK0615471T3 (da) | 1995-09-25 |
JP2798501B2 (ja) | 1998-09-17 |
CA2124952C (en) | 1998-04-28 |
EP0615471A1 (de) | 1994-09-21 |
ES2075778T3 (es) | 1995-10-01 |
DE4233256C1 (de) | 1993-12-02 |
AU4819393A (en) | 1994-04-26 |
JPH06511131A (ja) | 1994-12-08 |
AU664645B2 (en) | 1995-11-23 |
ZA937293B (en) | 1994-04-25 |
CA2124952A1 (en) | 1994-04-14 |
WO1994007615A1 (de) | 1994-04-14 |
US5583293A (en) | 1996-12-10 |
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