EP0401027A2 - Akustischer Wandler - Google Patents

Akustischer Wandler Download PDF

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Publication number
EP0401027A2
EP0401027A2 EP90305961A EP90305961A EP0401027A2 EP 0401027 A2 EP0401027 A2 EP 0401027A2 EP 90305961 A EP90305961 A EP 90305961A EP 90305961 A EP90305961 A EP 90305961A EP 0401027 A2 EP0401027 A2 EP 0401027A2
Authority
EP
European Patent Office
Prior art keywords
piezoelectric
transducer
aperture
piezoelectric material
distribution
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.)
Withdrawn
Application number
EP90305961A
Other languages
English (en)
French (fr)
Other versions
EP0401027A3 (de
Inventor
Gordon Hayward
Victor James Murray
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.)
BAE Systems Electronics Ltd
Original Assignee
GEC Marconi Ltd
Marconi Co Ltd
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 GEC Marconi Ltd, Marconi Co Ltd filed Critical GEC Marconi Ltd
Publication of EP0401027A2 publication Critical patent/EP0401027A2/de
Publication of EP0401027A3 publication Critical patent/EP0401027A3/de
Withdrawn legal-status Critical Current

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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
    • B06B1/0607—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 multiple elements
    • B06B1/0622—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 multiple elements on one surface
    • B06B1/0629—Square array

Definitions

  • This invention relates to an acoustic transducer.
  • the invention arose as a result of research into techniques for controlling the beam-shape (in particular for eliminating side lobes) in the radiation pattern of an acoustic transducer.
  • Such control is normally achieved by applying a apodisation function to individual transducers across an array. Doing this requires complicated and expensive driving circuitry and also requires individual connections to be made to each element in the array.
  • the inventors have now realised that this problem can be overcome using the technique described in the immediately preceding paragraph.
  • the invention provides an acoustic transducer comprising a layer of piezoelectric and non-piezoelectric material distributed across an aperture of the transducer and electrode means on each side of the layer for applying an input signal to it or receiving an output signal from it; the manner of distribution of the piezoelectric and non-­piezoelectric being such that the amplitude of vibration caused by a given input signal (or the amplitude of an output signal caused by a given variation) is dependent on a control function defined by (a) the percentage and/or distribution and/or type of piezoelectric material and/or (b) the percentage and/or distribution and/or type of non-­piezoelectric material, characterised in that the said function varies across the aperture.
  • the required apodisation characteristics can be obtained from a single excitation source and the individual connections can be made using just two electrodes.
  • control function can be varied in a number of different ways, for example by varying:
  • One possible construction comprises an array of individual peizoelectric elements seperated by a matrix of non-piezoelectric material.
  • Alternative possibilities include using a single piezoelectric slab formed with holes into which non-piezoelectric is loaded.
  • Another possibility would be to use a honeycomb or sponge-like structure of piezoelectric filled with non-piezoelectric or vice-versa.
  • Another possibility would be to mix piezoelectric and non-piezoelectric, e.g. by powdering a ceramic piezoelectric material and mixing it with a suitable non-piezoelectric filler.
  • the illustrated transducer comprises nine blocks, 1, 2A, 2B, 3A, 3B, 4A, 4B, 5A and 5B. Each block is individually made and the blocks are located together as shown.
  • Each block comprises a number of ceramic piezoelectric pillars, e.g. as shown at 5. These are made of a commonly used material, namely lead-zirconate-­titanate type ceramic. The pillars are embedded in a hard-setting epoxy using established slice-and-fill techniques. The individual blocks are held together by adhesive and opposite sides are then coated with metallic paint to form electrodes 6 and 7.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
EP19900305961 1989-06-02 1990-05-31 Akustischer Wandler Withdrawn EP0401027A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB898912782A GB8912782D0 (en) 1989-06-02 1989-06-02 An acoustic transducer
GB8912782 1989-06-02

Publications (2)

Publication Number Publication Date
EP0401027A2 true EP0401027A2 (de) 1990-12-05
EP0401027A3 EP0401027A3 (de) 1992-01-08

Family

ID=10657817

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900305961 Withdrawn EP0401027A3 (de) 1989-06-02 1990-05-31 Akustischer Wandler

Country Status (4)

Country Link
EP (1) EP0401027A3 (de)
JP (1) JPH03113999A (de)
CA (1) CA2017382A1 (de)
GB (2) GB8912782D0 (de)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5371717A (en) * 1993-06-15 1994-12-06 Hewlett-Packard Company Microgrooves for apodization and focussing of wideband clinical ultrasonic transducers
US5423319A (en) * 1994-06-15 1995-06-13 Hewlett-Packard Company Integrated impedance matching layer to acoustic boundary problems for clinical ultrasonic transducers
US5434827A (en) * 1993-06-15 1995-07-18 Hewlett-Packard Company Matching layer for front acoustic impedance matching of clinical ultrasonic tranducers
US5460181A (en) * 1994-10-06 1995-10-24 Hewlett Packard Co. Ultrasonic transducer for three dimensional imaging
US5465725A (en) * 1993-06-15 1995-11-14 Hewlett Packard Company Ultrasonic probe
EP0689187A1 (de) * 1994-06-24 1995-12-27 Advanced Technology Laboratories, Inc. Diagnoseultraschallwandleranordnung mit Elevationsfokus
EP0707898A2 (de) * 1994-10-21 1996-04-24 Hewlett-Packard Company Formungsverfahren für integrale Wandler und Impedanzanpassungsschichten
US5546946A (en) * 1994-06-24 1996-08-20 Advanced Technology Laboratories, Inc. Ultrasonic diagnostic transducer array with elevation focus
DE102006015493A1 (de) * 2006-04-03 2007-10-11 Atlas Elektronik Gmbh Elektroakustischer Wandler
ITGE20100018A1 (it) * 2010-02-23 2011-08-24 Esaote Spa Sonda ad ultrasuoni
WO2012131212A1 (fr) 2011-03-30 2012-10-04 Edap Tms France Procede et appareil de generation d'ondes ultrasonores focalisees a modulation de surface
EP2796209A3 (de) * 2013-04-25 2015-06-10 Canon Kabushiki Kaisha Kapazitiver Wandler und Verfahren zu seiner Herstellung
US9683971B2 (en) 2013-04-25 2017-06-20 Canon Kabushiki Kaisha Object information acquiring apparatus and control method thereof
US10293374B2 (en) 2013-04-25 2019-05-21 Canon Kabushiki Kaisha Capacitive transducer and method of manufacturing same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4413568B2 (ja) * 2003-09-19 2010-02-10 パナソニック株式会社 超音波探触子

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2114857A (en) * 1982-02-16 1983-08-24 Gen Electric Ultrasonic transducer shading
DE3334090A1 (de) * 1982-09-22 1984-03-22 North American Philips Corp., 10017 New York, N.Y. Apodisierter ultraschallwandler
EP0137529A2 (de) * 1983-08-15 1985-04-17 Koninklijke Philips Electronics N.V. Verfahren zur Herstellung elektrischer Kompositwandler
GB2190818A (en) * 1986-05-07 1987-11-25 Brueel & Kjaer As An ultrasonic transducer for providing a desired sound field

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2006434B (en) * 1977-10-20 1982-03-03 Rca Corp Switchable depth of focus pulse-echo ultra-sonic imaging display system
GB2095951A (en) * 1981-02-19 1982-10-06 Nat Res Dev Transducers of improved resolution and systems for the transmission and reception of radiation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2114857A (en) * 1982-02-16 1983-08-24 Gen Electric Ultrasonic transducer shading
DE3334090A1 (de) * 1982-09-22 1984-03-22 North American Philips Corp., 10017 New York, N.Y. Apodisierter ultraschallwandler
EP0137529A2 (de) * 1983-08-15 1985-04-17 Koninklijke Philips Electronics N.V. Verfahren zur Herstellung elektrischer Kompositwandler
GB2190818A (en) * 1986-05-07 1987-11-25 Brueel & Kjaer As An ultrasonic transducer for providing a desired sound field

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ultrasonics international 87 conf. proc., london6-9 july 1987, p. 426-431, D. J. Mehrl et al. : "Design and evaluation of apodized piezo__ electric transducers" *

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5371717A (en) * 1993-06-15 1994-12-06 Hewlett-Packard Company Microgrooves for apodization and focussing of wideband clinical ultrasonic transducers
EP0629992A2 (de) * 1993-06-15 1994-12-21 Hewlett-Packard Company Mikrorillen für Apodisierung und Fokussierung von breitbandiger klinischer Ultraschallwandler
US5434827A (en) * 1993-06-15 1995-07-18 Hewlett-Packard Company Matching layer for front acoustic impedance matching of clinical ultrasonic tranducers
US5438554A (en) * 1993-06-15 1995-08-01 Hewlett-Packard Company Tunable acoustic resonator for clinical ultrasonic transducers
EP0629992A3 (de) * 1993-06-15 1995-10-25 Hewlett Packard Co Mikrorillen für Apodisierung und Fokussierung von breitbandiger klinischer Ultraschallwandler.
US5465725A (en) * 1993-06-15 1995-11-14 Hewlett Packard Company Ultrasonic probe
US5423319A (en) * 1994-06-15 1995-06-13 Hewlett-Packard Company Integrated impedance matching layer to acoustic boundary problems for clinical ultrasonic transducers
EP0689187A1 (de) * 1994-06-24 1995-12-27 Advanced Technology Laboratories, Inc. Diagnoseultraschallwandleranordnung mit Elevationsfokus
US5546946A (en) * 1994-06-24 1996-08-20 Advanced Technology Laboratories, Inc. Ultrasonic diagnostic transducer array with elevation focus
US5460181A (en) * 1994-10-06 1995-10-24 Hewlett Packard Co. Ultrasonic transducer for three dimensional imaging
EP0707898A2 (de) * 1994-10-21 1996-04-24 Hewlett-Packard Company Formungsverfahren für integrale Wandler und Impedanzanpassungsschichten
EP0707898A3 (de) * 1994-10-21 1997-07-23 Hewlett Packard Co Formungsverfahren für integrale Wandler und Impedanzanpassungsschichten
DE102006015493A1 (de) * 2006-04-03 2007-10-11 Atlas Elektronik Gmbh Elektroakustischer Wandler
DE102006015493B4 (de) * 2006-04-03 2010-12-23 Atlas Elektronik Gmbh Elektroakustischer Wandler
ITGE20100018A1 (it) * 2010-02-23 2011-08-24 Esaote Spa Sonda ad ultrasuoni
WO2012131212A1 (fr) 2011-03-30 2012-10-04 Edap Tms France Procede et appareil de generation d'ondes ultrasonores focalisees a modulation de surface
FR2973550A1 (fr) * 2011-03-30 2012-10-05 Edap Tms France Procede et appareil de generation d'ondes ultrasonores focalisees a modulation de surface
CN103650031A (zh) * 2011-03-30 2014-03-19 Edaptms法国公司 利用表面调制产生聚焦超声波的方法和设备
CN103650031B (zh) * 2011-03-30 2016-08-31 Edaptms法国公司 利用表面调制产生聚焦超声波的方法和设备
US9936969B2 (en) 2011-03-30 2018-04-10 Edap Tms France Method and apparatus for generating focused ultrasonic waves with surface modulation
EP2796209A3 (de) * 2013-04-25 2015-06-10 Canon Kabushiki Kaisha Kapazitiver Wandler und Verfahren zu seiner Herstellung
US9683971B2 (en) 2013-04-25 2017-06-20 Canon Kabushiki Kaisha Object information acquiring apparatus and control method thereof
US10189049B2 (en) 2013-04-25 2019-01-29 Canon Kabushiki Kaisha Capacitive transducer and method of manufacturing same
US10293374B2 (en) 2013-04-25 2019-05-21 Canon Kabushiki Kaisha Capacitive transducer and method of manufacturing same

Also Published As

Publication number Publication date
GB2232323A (en) 1990-12-05
JPH03113999A (ja) 1991-05-15
CA2017382A1 (en) 1990-12-02
GB9012171D0 (en) 1990-07-18
EP0401027A3 (de) 1992-01-08
GB8912782D0 (en) 1989-07-19

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