EP0118837A2 - Transducteur ultrasonore - Google Patents
Transducteur ultrasonore Download PDFInfo
- Publication number
- EP0118837A2 EP0118837A2 EP84102147A EP84102147A EP0118837A2 EP 0118837 A2 EP0118837 A2 EP 0118837A2 EP 84102147 A EP84102147 A EP 84102147A EP 84102147 A EP84102147 A EP 84102147A EP 0118837 A2 EP0118837 A2 EP 0118837A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- ultrasonic transducer
- receiving layer
- piezoelectric plastic
- transducer according
- 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
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Classifications
-
- 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
Definitions
- the invention relates to an ultrasonic transducer with a support body, a transmission layer made of a material with a relatively high dielectric constant and a first ⁇ / 4 adaptation layer, which faces the transmission layer, and a second ⁇ / 4 adaptation layer, which faces a load.
- Ultrasonic broadband converters are used in medical ultrasound diagnostics and non-destructive material testing.
- the medical application where a coupling between tissue and sound transducer must be carried out with the lowest possible losses, requires an improvement in the electromechanical and acoustic properties of these transducer systems.
- An ultrasonic transducer is known, the ceramic transducer of which is adapted to a load medium, tissue or water, by means of two A / 4 adaptation layers.
- This transducer system contains an epoxy resin backing with an acoustic impedance of 3x10 6 Pas / m, a ceramic transducer, a first ⁇ / 4 matching layer made of glass with an acoustic impedance of 10x10 6 Pas / m and a second 1/4 matching layer made of polyacrylic or made of epoxy resin with an acoustic impedance of 3x10 6 Pas / m.
- the ceramic converter is arranged on a backing.
- the glass plate as the first adjustment layer is very adhesive with an adhesive low viscosity, so that adhesive layers are in the range of about 2 microns.
- the epoxy resin, as the second adaptation layer is poured directly onto the first adaptation layer (experimental studies on the construction of ultrasound broadband transducers, biomedical engineering, volume 27, issues 7 to 8, 1982, pages 182 to 185). This double ⁇ / 4 adaptation only improves the sensitivity and the bandwidth of the ceramic transmission layer. The bandwidth of this ultrasonic transducer is approximately 60 to 70% of the center frequency.
- an ultrasonic transducer which has a transmission layer made of a material with a relatively high dielectric constant and high sound impedance and a reception layer made of a material with a relatively low dielectric constant and low sound impedance, which are connected flatly in hybrid technology.
- the transmission layer consists, for example, of lead zirconate titanate PZT or lead metaniobate Pb (NG 3 ).
- the receiving layer consists of a piezoelectric plastic film with an acoustic impedance of approximately 3 ⁇ 10 6 Pas / m, for example polyvinylidene fluoride PVDF or polycarbonate or polyvinyl chloride PVC.
- the receiving layer should also be an adaptation layer for the transmission case (German patent specification 29 14 031).
- the formation of the receiving layer as an adaptation layer for adaptation to body tissue can, however, only be designed as a simple ⁇ / 4 layer.
- the adaptation layer for the transmission case is not a simple / 4 adaptation. With a simple 1/4 adjustment, the theory results in an adjustment layer with an acoustic impedance of about 7x10 6 Pas / m.
- the invention is based on the object of specifying an ultrasonic transducer with an effective broadband transmitter and a sensitive and broadband receiver.
- the ceramic vibrating material of the transmission layer is to be broadband adapted to tissue or water.
- the receiving layer consists of a stack of thin piezoelectric plastic films that are electrically connected in series. This design of the receiving layer makes it easier to polarize the individual piezoelectric plastic films due to the small thickness.
- the receiving layer consists of an active and a passive piezoelectric plastic film, the active piezoelectric plastic film being arranged on the first adaptation layer and the passive piezoelectric plastic film facing the load.
- the thickness of the passive piezoelectric plastic film is a multiple of the thickness of the active piezoelectric plastic film.
- an ultrasound transducer contains a support body 2, a transmission layer 4 and two ⁇ / 4 adaptation layers, the second A / 4 adaptation layer also being provided as a reception layer 6.
- the first ⁇ / 4 adaptation layer 8 faces the transmission layer 4 and is also provided as backing for the reception layer 6. All layers can preferably be connected to one another over a large area in hybrid technology.
- the thicknesses of the matching layers are each a quarter wavelength at a predetermined resonance frequency. With a resonance frequency of approximately 10 MHz, the thickness of the matching layers is, for example, 55 ⁇ m and, for a resonance frequency of approximately 2 MHz, for example, 275 ⁇ m.
- a material with a relatively high dielectric constant and high sound impedance serves as the transmission layer 4.
- a transmission layer 4 made of lead zirconate titanate PZT or lead metanobate Pb (N0 3 ) is preferred.
- the two matching layers have the task of matching different acoustic impedances to each other with little reflection.
- the material for the first adaptation layer 8 can be, for example, porcelain, preferably quartz glass, in particular a glass-like material (Macor), and for the second adaptation layer one can use, for example, polyvinyl chloride PVC, in particular polyvinylidene fluoride PVDF.
- the polyvinylidene fluoride PVDF layer must be polarized and provided with electrical connections which, like the electrical connections of the transmission layer, are not shown in FIG. 1.
- This design provides a broadband and sensitive ultrasound transducer, which is used in medicine in particular because of its almost low-reflection coupling between tissue and ultrasound transducer.
- the receiving layer 6 consists of a stack of thin piezoelectric plastic films 10 electrically connected in series. These piezoelectric plastic films 10 are each polarized in the same direction and the thickness of the stack is a quarter wavelength at a predetermined resonance frequency. Up to a frequency of, for example, 4 MHz, the stack can expediently consist of, for example, 25 ⁇ m thick plastic films 10, while for higher frequencies the stack can be constructed of, for example, 9 ⁇ m thick plastic films 10.
- polyvinyl chloride PVC in particular polyvinylidene fluoride PVDF, can be used as the material for the piezoelectric plastic films of the receiving layer 6.
- This configuration of the receiving layer 6 enables the thin, for example 9 ⁇ m to 25 ⁇ m thick, piezoelectric plastic films to be polarized very well.
- the receiving layer 6 consists of an active piezoelectric plastic film 12 and a thicker passive piezoelectric plastic film 14.
- the thickness of the passive piezoelectric plastic film 14 of the receiving layer 6 is a multiple, for example 2 to 15 times, of the thickness of the active piezoelectric plastic film 12 of the receiving layer 6.
- the active piezoelectric plastic film 12, which is for example 25 ⁇ m thick, is arranged on the first ⁇ / 4 matching layer 8 and the passive piezoelectric plastic film 14 faces the load.
- This configuration of the receiving layer 6 results in a broadband and sensitive ultrasound transducer with a comparatively large capacity and a correspondingly low internal impedance with comparatively small spatial dimensions.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Ultra Sonic Daignosis Equipment (AREA)
- Transducers For Ultrasonic Waves (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Surgical Instruments (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT84102147T ATE35338T1 (de) | 1983-03-15 | 1984-02-29 | Ultraschallwandler. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19833309236 DE3309236A1 (de) | 1983-03-15 | 1983-03-15 | Ultraschallwandler |
DE3309236 | 1983-03-15 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0118837A2 true EP0118837A2 (fr) | 1984-09-19 |
EP0118837A3 EP0118837A3 (en) | 1985-05-15 |
EP0118837B1 EP0118837B1 (fr) | 1988-06-22 |
Family
ID=6193523
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84102147A Expired EP0118837B1 (fr) | 1983-03-15 | 1984-02-29 | Transducteur ultrasonore |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0118837B1 (fr) |
JP (1) | JPS59161800U (fr) |
AT (1) | ATE35338T1 (fr) |
CA (1) | CA1252558A (fr) |
DE (2) | DE3309236A1 (fr) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0166976A1 (fr) * | 1984-06-14 | 1986-01-08 | Siemens Aktiengesellschaft | Ensemble de transducteurs à ultrasons |
DE3501808A1 (de) * | 1985-01-21 | 1986-07-24 | Siemens AG, 1000 Berlin und 8000 München | Ultraschallwandler |
EP0212352A1 (fr) * | 1985-08-09 | 1987-03-04 | Siemens Aktiengesellschaft | Générateur d'ultrasons |
EP0421286A2 (fr) * | 1989-10-03 | 1991-04-10 | Richard Wolf GmbH | Transducteur piézoélectrique |
EP0451517A1 (fr) * | 1990-04-11 | 1991-10-16 | Hewlett-Packard Company | Acquisition d'image acoustique |
US5263004A (en) * | 1990-04-11 | 1993-11-16 | Hewlett-Packard Company | Acoustic image acquisition using an acoustic receiving array with variable time delay |
DE19714606A1 (de) * | 1997-04-09 | 1998-10-15 | Itt Mfg Enterprises Inc | Ultraschallsensormodul mit Folienwandler |
WO1999032858A1 (fr) * | 1997-12-23 | 1999-07-01 | Simmonds Precision Products, Inc. | Dispositif a ultrasons pour la mesure de niveau de liquide |
EP2295154A1 (fr) * | 2009-09-15 | 2011-03-16 | Fujifilm Corporation | Transducteur ultrasonique, sonde ultrasonique et procédé de production |
US20230134074A1 (en) * | 2021-10-28 | 2023-05-04 | Baker Hughes, A Ge Company, Llc | Ultrasonic transducer for flow measurement |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3430186A1 (de) * | 1984-08-16 | 1986-02-27 | Siemens AG, 1000 Berlin und 8000 München | Verfahren zur herstellung eines poroesen piezoelektrischen materials und nach diesem verfahren hergestelltes material |
DE3839057A1 (de) * | 1988-11-18 | 1990-05-23 | Fraunhofer Ges Forschung | Gruppenstrahler |
DE102007027277A1 (de) * | 2007-06-11 | 2008-12-18 | Endress + Hauser Flowtec Ag | Ultraschallsensor |
WO2009066519A1 (fr) * | 2007-11-21 | 2009-05-28 | Konica Minolta Medical & Graphic, Inc. | Oscillateur pour réception d'ondes ultrasonores, son procédé de fabrication, sonde à onde ultrasonore et système d'imagerie médicale de diagnostic à onde ultrasonore |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4016530A (en) * | 1975-06-02 | 1977-04-05 | Goll Jeffrey H | Broadband electroacoustic converter |
EP0021534A1 (fr) * | 1979-06-25 | 1981-01-07 | Koninklijke Philips Electronics N.V. | Transducteur acoustique |
US4427912A (en) * | 1982-05-13 | 1984-01-24 | Ausonics Pty. Ltd. | Ultrasound transducer for enhancing signal reception in ultrasound equipment |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57141199A (en) * | 1981-02-25 | 1982-09-01 | Aloka Co Ltd | Ultrasonic wave probe |
-
1983
- 1983-03-15 DE DE19833309236 patent/DE3309236A1/de not_active Withdrawn
-
1984
- 1984-02-29 EP EP84102147A patent/EP0118837B1/fr not_active Expired
- 1984-02-29 AT AT84102147T patent/ATE35338T1/de not_active IP Right Cessation
- 1984-02-29 DE DE8484102147T patent/DE3472318D1/de not_active Expired
- 1984-03-09 JP JP1984034047U patent/JPS59161800U/ja active Granted
- 1984-03-13 CA CA000449456A patent/CA1252558A/fr not_active Expired
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4016530A (en) * | 1975-06-02 | 1977-04-05 | Goll Jeffrey H | Broadband electroacoustic converter |
EP0021534A1 (fr) * | 1979-06-25 | 1981-01-07 | Koninklijke Philips Electronics N.V. | Transducteur acoustique |
US4427912A (en) * | 1982-05-13 | 1984-01-24 | Ausonics Pty. Ltd. | Ultrasound transducer for enhancing signal reception in ultrasound equipment |
Non-Patent Citations (1)
Title |
---|
Biomedizinische Technik, Bd. 27 Heft 7 Seiten 183-184 * |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0166976A1 (fr) * | 1984-06-14 | 1986-01-08 | Siemens Aktiengesellschaft | Ensemble de transducteurs à ultrasons |
DE3501808A1 (de) * | 1985-01-21 | 1986-07-24 | Siemens AG, 1000 Berlin und 8000 München | Ultraschallwandler |
US4672591A (en) * | 1985-01-21 | 1987-06-09 | Siemens Aktiengesellschaft | Ultrasonic transducer |
EP0212352A1 (fr) * | 1985-08-09 | 1987-03-04 | Siemens Aktiengesellschaft | Générateur d'ultrasons |
US4718421A (en) * | 1985-08-09 | 1988-01-12 | Siemens Aktiengesellschaft | Ultrasound generator |
EP0421286A3 (en) * | 1989-10-03 | 1992-06-03 | Richard Wolf Gmbh | Piezoelectric transducer |
EP0421286A2 (fr) * | 1989-10-03 | 1991-04-10 | Richard Wolf GmbH | Transducteur piézoélectrique |
EP0451517A1 (fr) * | 1990-04-11 | 1991-10-16 | Hewlett-Packard Company | Acquisition d'image acoustique |
US5263004A (en) * | 1990-04-11 | 1993-11-16 | Hewlett-Packard Company | Acoustic image acquisition using an acoustic receiving array with variable time delay |
DE19714606A1 (de) * | 1997-04-09 | 1998-10-15 | Itt Mfg Enterprises Inc | Ultraschallsensormodul mit Folienwandler |
WO1999032858A1 (fr) * | 1997-12-23 | 1999-07-01 | Simmonds Precision Products, Inc. | Dispositif a ultrasons pour la mesure de niveau de liquide |
EP2295154A1 (fr) * | 2009-09-15 | 2011-03-16 | Fujifilm Corporation | Transducteur ultrasonique, sonde ultrasonique et procédé de production |
US20230134074A1 (en) * | 2021-10-28 | 2023-05-04 | Baker Hughes, A Ge Company, Llc | Ultrasonic transducer for flow measurement |
US11806749B2 (en) * | 2021-10-28 | 2023-11-07 | Baker Hughes, A Ge Company, Llc | Ultrasonic transducer for flow measurement |
Also Published As
Publication number | Publication date |
---|---|
DE3472318D1 (en) | 1988-07-28 |
JPH0453117Y2 (fr) | 1992-12-14 |
CA1252558A (fr) | 1989-04-11 |
ATE35338T1 (de) | 1988-07-15 |
EP0118837B1 (fr) | 1988-06-22 |
EP0118837A3 (en) | 1985-05-15 |
DE3309236A1 (de) | 1984-09-20 |
JPS59161800U (ja) | 1984-10-30 |
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