EP0118837B1 - Ultraschallwandler - Google Patents

Ultraschallwandler Download PDF

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Publication number
EP0118837B1
EP0118837B1 EP84102147A EP84102147A EP0118837B1 EP 0118837 B1 EP0118837 B1 EP 0118837B1 EP 84102147 A EP84102147 A EP 84102147A EP 84102147 A EP84102147 A EP 84102147A EP 0118837 B1 EP0118837 B1 EP 0118837B1
Authority
EP
European Patent Office
Prior art keywords
layer
ultrasonic transducer
receiving layer
plastics material
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.)
Expired
Application number
EP84102147A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0118837A2 (de
EP0118837A3 (en
Inventor
Reinhard Dr. Lerch
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to AT84102147T priority Critical patent/ATE35338T1/de
Publication of EP0118837A2 publication Critical patent/EP0118837A2/de
Publication of EP0118837A3 publication Critical patent/EP0118837A3/de
Application granted granted Critical
Publication of EP0118837B1 publication Critical patent/EP0118837B1/de
Expired legal-status Critical Current

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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 X / 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 keymetric transducer of which is adapted to a load medium, tissue or water, by means of two X / 4 adaptation layers.
  • This transducer system contains an epoxy resin backing with an acoustic impedance of 3 x 10 6 Pas / m, a ceramic transducer, a first ⁇ / 4 matching layer made of glass with an acoustic impedance of 10 x 10 6 Pas / m and a second X / 4 Matching layer made of polyacrylic or epoxy resin with an acoustic impedance of 3 x 10 6 Pas / m.
  • the ceramic converter is arranged on a backing.
  • the glass plate as the first adaptation layer is made with an adhesive adhesive of very low viscosity, so that adhesive layers are in the range of approximately 2 ⁇ m.
  • the epoxy resin as a 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 metanobate Pb (N0 3 ).
  • the receiving layer consists of a piezoelectric plastic film with an acoustic impedance of approximately 3 x 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 2914 031).
  • the formation of the receiving layer as an adaptation layer for adaptation to body tissue can, however, only be designed as a simple X / 4 layer.
  • the adaptation layer for the transmission case is not a simple X / 4 adaptation.
  • the theory results in an adaptation layer with an acoustic impedance of approximately 7 x 10 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 matching 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 X / 4 adaptation layers, the second X / 4 adaptation layer being simultaneously provided as a reception layer 6.
  • the first ⁇ / 4 adaptation layer 8 faces the transmission layer 4 and at the same time is 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 with a resonance frequency of approximately 2 MHz for example 275 ⁇ m.
  • a material with a relatively high dielectric constant and high sound impedance for example a piezoceramic material, serves as the transmission layer 4.
  • the two matching layers have the task of matching different acoustic impedances to each other with little reflection.
  • the transmitting layer made of lead-zirconate-titanate PZT with an acoustic impedance of approximately 30 x 10 6 Pas / m to a load, for example tissue or water with an acoustic impedance of 1.5x10 8 Pas / m.
  • multi-stage transformation with two X / 4 adjustment layers is known from the theory, in which a permissible input reflection factor is approximated according to the Chebyshev curve.
  • 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 which are 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 allows 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, the thickness of the active one 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 X / 4 matching layer 8, and the passive piezoelectric plastic film 14 faces the load.
  • the material used for the piezoelectric plastic films of the receiving layer 6 is, for example, polyvinyl chloride PVC, in particular polyvinylidene fluoride PVDF. Both the active and the passive piezoelectric plastic film 12 or 14 consist of the same material, the active piezoelectric plastic film 12 being polarized.
  • This configuration of the receiving layer 6 results in a broadband and sensitive ultrasound transducer with a relatively large capacitance and a correspondingly low internal impedance with relatively 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)
  • Surgical Instruments (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
EP84102147A 1983-03-15 1984-02-29 Ultraschallwandler Expired EP0118837B1 (de)

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
DE3309236 1983-03-15
DE19833309236 DE3309236A1 (de) 1983-03-15 1983-03-15 Ultraschallwandler

Publications (3)

Publication Number Publication Date
EP0118837A2 EP0118837A2 (de) 1984-09-19
EP0118837A3 EP0118837A3 (en) 1985-05-15
EP0118837B1 true EP0118837B1 (de) 1988-06-22

Family

ID=6193523

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84102147A Expired EP0118837B1 (de) 1983-03-15 1984-02-29 Ultraschallwandler

Country Status (5)

Country Link
EP (1) EP0118837B1 (enrdf_load_stackoverflow)
JP (1) JPS59161800U (enrdf_load_stackoverflow)
AT (1) ATE35338T1 (enrdf_load_stackoverflow)
CA (1) CA1252558A (enrdf_load_stackoverflow)
DE (2) DE3309236A1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007027277A1 (de) * 2007-06-11 2008-12-18 Endress + Hauser Flowtec Ag Ultraschallsensor

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3422115A1 (de) * 1984-06-14 1985-12-19 Siemens AG, 1000 Berlin und 8000 München Ultraschallwandlersystem
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
DE3501808A1 (de) * 1985-01-21 1986-07-24 Siemens AG, 1000 Berlin und 8000 München Ultraschallwandler
DE3665949D1 (en) * 1985-08-09 1989-11-02 Siemens Ag Ultrasonic generator
DE3839057A1 (de) * 1988-11-18 1990-05-23 Fraunhofer Ges Forschung Gruppenstrahler
DE3932959C1 (enrdf_load_stackoverflow) * 1989-10-03 1991-04-11 Richard Wolf Gmbh, 7134 Knittlingen, De
US5263004A (en) * 1990-04-11 1993-11-16 Hewlett-Packard Company Acoustic image acquisition using an acoustic receiving array with variable time delay
EP0451517B1 (en) * 1990-04-11 1996-05-01 Hewlett-Packard Company Acoustic image acquisition
DE19714606A1 (de) * 1997-04-09 1998-10-15 Itt Mfg Enterprises Inc Ultraschallsensormodul mit Folienwandler
EP1042653A1 (en) * 1997-12-23 2000-10-11 Simmonds Precision Products Inc. Ultrasonic liquid gauging system
JP5392090B2 (ja) * 2007-11-21 2014-01-22 コニカミノルタ株式会社 超音波受信用振動子、その製造方法、超音波探触子及び超音波医用画像診断装置
EP2444166A1 (en) * 2009-09-15 2012-04-25 Fujifilm Corporation Ultrasonic transducer, ultrasonic probe and producing method
US11806749B2 (en) * 2021-10-28 2023-11-07 Baker Hughes, A Ge Company, Llc Ultrasonic transducer for flow measurement

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4016530A (en) * 1975-06-02 1977-04-05 Goll Jeffrey H Broadband electroacoustic converter
NL7904924A (nl) * 1979-06-25 1980-12-30 Philips Nv Akoestische transducent.
JPS57141199A (en) * 1981-02-25 1982-09-01 Aloka Co Ltd Ultrasonic wave probe
US4427912A (en) * 1982-05-13 1984-01-24 Ausonics Pty. Ltd. Ultrasound transducer for enhancing signal reception in ultrasound equipment

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Biomedizinische Technik, Bd. 27 Heft 7 Seiten 183-184 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007027277A1 (de) * 2007-06-11 2008-12-18 Endress + Hauser Flowtec Ag Ultraschallsensor

Also Published As

Publication number Publication date
ATE35338T1 (de) 1988-07-15
EP0118837A2 (de) 1984-09-19
JPS59161800U (ja) 1984-10-30
EP0118837A3 (en) 1985-05-15
DE3472318D1 (en) 1988-07-28
DE3309236A1 (de) 1984-09-20
CA1252558A (en) 1989-04-11
JPH0453117Y2 (enrdf_load_stackoverflow) 1992-12-14

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