EP0043195A1 - Transducteurs ultrasoniques - Google Patents

Transducteurs ultrasoniques Download PDF

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Publication number
EP0043195A1
EP0043195A1 EP81302576A EP81302576A EP0043195A1 EP 0043195 A1 EP0043195 A1 EP 0043195A1 EP 81302576 A EP81302576 A EP 81302576A EP 81302576 A EP81302576 A EP 81302576A EP 0043195 A1 EP0043195 A1 EP 0043195A1
Authority
EP
European Patent Office
Prior art keywords
plate
piezoelectric material
ultrasonic transducer
elements
excited
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Withdrawn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
EP81302576A
Other languages
German (de)
English (en)
Inventor
Michael John Poole
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.)
UK Atomic Energy Authority
Original Assignee
UK Atomic Energy Authority
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 UK Atomic Energy Authority filed Critical UK Atomic Energy Authority
Publication of EP0043195A1 publication Critical patent/EP0043195A1/fr
Withdrawn legal-status Critical Current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

Definitions

  • the present invention relates to ultrasonic transducers.
  • ultrasonic transducer ha a transmitting element which consists of a plate of piezoelectric material which is excited so as to vibrate in the thickness, or piston mode, that is to say its outer face moves normal to itself.
  • a transmitting element which consists of a plate of piezoelectric material which is excited so as to vibrate in the thickness, or piston mode, that is to say its outer face moves normal to itself.
  • the surface of the plate of piezoelectric material does not move uniformly but divides up into regions which vibrate with differing phases relative to one another. This can have the effect of producing ultrasonic vibrations which, instead of being in the form of a single beam with a simple polar diagram, have a complicated polar diagram with a number of side lobes. This undesirable effect occurs when the linear dimensions of the surface of the plate are larger than its thickness.
  • an ultrasonic transducer including a plate of piezoelectric material which can be excited to produce ultrasonic vibrations in a medium which is coupled acoustically to the transducer, and means for so exciting the plate of piezoelectric material, wherein the plate of piezoelectric material is divided into elements such that each element has at least one surface dimension which is considerably smaller than the thickness of the plate of piezoelectric material, and each element is coupled to the exciting means so that the elements are excited simultaneously.
  • the divisions between the elements preferably pass right through the plate of piezoelectric material. However, providing the divisions are deep enough for the basic criterion to be satisfied, this is not essential. Furthermore, a continuous strip of piezoelectric material may be left around the edge of the plate so as to maintain the plate form of the transducer.
  • the individual piezoelectric elements so formed preferably are decoupled from one another completely, but again the decoupling need not be total. For example, if a transducer is to be used under water, the water can be allowed to penetrate into the gaps between the elements of the plate of piezoelectric material.
  • an ultrasonic transducer consists of a plate 1 made of any suitable piezoelectric material, such as that known in the art as PZT, which has layers 2 of silver deposited on its major faces. Copper foils 3 are soldered to the layers 2 of silver to provide electrodes by means of which the plate 1 can be excited to emit ultrasound.
  • the plate 1 is bonded to a sound absorbing backing member 4 which is made of tungsten dispersed in a resin material.
  • the plate 1 is divided into a plurality of elements 5 by means of a series of slits 6 which penetrate right through the plate 1, the lower silver layer 2, and copper foil 3, and into the backing member 4.
  • the top copper foil 3, however, is continuous having been placed in position after the division of the:-plate 1.
  • Two strips 7 of insulating material are attached to opposite sides of the backing member 4 so as to close off the slits 6 in the plate 1.
  • the top layer 3 of copper is brought down and it is bonded to the strips 7, so that the slits 6 in the plate 1 are totally enclosed.
  • the strips 7 also serve to prevent electrical contact between the copper foils 3.
  • a suitable spacing between the slits 6 is between one half and one third of the thickness of the plate 1.
  • the slits 6 can be made as thin as is convenient.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transducers For Ultrasonic Waves (AREA)
EP81302576A 1980-06-26 1981-06-10 Transducteurs ultrasoniques Withdrawn EP0043195A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8021043 1980-06-26
GB8021043 1980-06-26

Publications (1)

Publication Number Publication Date
EP0043195A1 true EP0043195A1 (fr) 1982-01-06

Family

ID=10514362

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81302576A Withdrawn EP0043195A1 (fr) 1980-06-26 1981-06-10 Transducteurs ultrasoniques

Country Status (2)

Country Link
EP (1) EP0043195A1 (fr)
JP (1) JPS5748898A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0140363A2 (fr) * 1983-10-31 1985-05-08 Advanced Technology Laboratories, Inc. Construction d'un groupement de transducteurs

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3952387A (en) * 1973-07-03 1976-04-27 Tokyo Shibaura Electric Co., Ltd. Method of manufacturing an ultrasonic probe
US4122725A (en) * 1976-06-16 1978-10-31 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Length mode piezoelectric ultrasonic transducer for inspection of solid objects
EP0005071A2 (fr) * 1978-04-25 1979-10-31 Kabushiki Kaisha Toshiba Tête de mesure du type à balayage électronique pour un appareil de diagnostic ultrasonore
EP0006623A2 (fr) * 1978-07-05 1980-01-09 Siemens Aktiengesellschaft Transducteur ultrasonique
GB2035010A (en) * 1978-11-08 1980-06-11 Gen Electric Front surface matched ultrasonic transducer array with wide field of view
EP0025092A1 (fr) * 1979-07-20 1981-03-18 Siemens Aktiengesellschaft Transducteur ultrasonore et procédé pour sa fabrication

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3952387A (en) * 1973-07-03 1976-04-27 Tokyo Shibaura Electric Co., Ltd. Method of manufacturing an ultrasonic probe
US4122725A (en) * 1976-06-16 1978-10-31 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Length mode piezoelectric ultrasonic transducer for inspection of solid objects
EP0005071A2 (fr) * 1978-04-25 1979-10-31 Kabushiki Kaisha Toshiba Tête de mesure du type à balayage électronique pour un appareil de diagnostic ultrasonore
EP0006623A2 (fr) * 1978-07-05 1980-01-09 Siemens Aktiengesellschaft Transducteur ultrasonique
GB2035010A (en) * 1978-11-08 1980-06-11 Gen Electric Front surface matched ultrasonic transducer array with wide field of view
EP0025092A1 (fr) * 1979-07-20 1981-03-18 Siemens Aktiengesellschaft Transducteur ultrasonore et procédé pour sa fabrication

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0140363A2 (fr) * 1983-10-31 1985-05-08 Advanced Technology Laboratories, Inc. Construction d'un groupement de transducteurs
EP0140363A3 (fr) * 1983-10-31 1987-03-04 Advanced Technology Laboratories, Inc. Construction d'un groupement de transducteurs

Also Published As

Publication number Publication date
JPS5748898A (en) 1982-03-20

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR NL

STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19821212

RIN1 Information on inventor provided before grant (corrected)

Inventor name: POOLE, MICHAEL JOHN