EP1169143B1 - Transducteur acoustique a impulsions comprenant un bloc elementaire en materiau piezoceramique - Google Patents

Transducteur acoustique a impulsions comprenant un bloc elementaire en materiau piezoceramique Download PDF

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Publication number
EP1169143B1
EP1169143B1 EP00929375A EP00929375A EP1169143B1 EP 1169143 B1 EP1169143 B1 EP 1169143B1 EP 00929375 A EP00929375 A EP 00929375A EP 00929375 A EP00929375 A EP 00929375A EP 1169143 B1 EP1169143 B1 EP 1169143B1
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EP
European Patent Office
Prior art keywords
block
elementary
piezoelectric material
electrode
collar
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
Application number
EP00929375A
Other languages
German (de)
English (en)
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EP1169143A1 (fr
Inventor
Bicz Wieslaw
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.)
Sonident Anstalt
Original Assignee
Sonident Anstalt
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 Sonident Anstalt filed Critical Sonident Anstalt
Publication of EP1169143A1 publication Critical patent/EP1169143A1/fr
Application granted granted Critical
Publication of EP1169143B1 publication Critical patent/EP1169143B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B06B1/0644—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

Definitions

  • the invention relates to a pulse transducer in the ultrasonic range. Such converters are needed in many areas of technology where short pulses are necessary.
  • the first priority is defectoscopy, which is what the Sonography in the medical field.
  • Transducers also have relatively good pulse shapes and good repeatability lenticular elementary blocks, however, they produce only weak signals and are considerably less sensitive compared to classic converters. The same disadvantages have also been found on converters, which are caused by special Electrode design or inhomogeneous polarization of the piezo element capable are to deliver relatively short signals.
  • the object underlying the invention is a sound transducer to create for the ultrasound range. that sends out strong and short impulses has a high sensitivity and repeatability of the parameters series production guaranteed.
  • the object is achieved according to the invention the features of the pulse transducer contained in the characterizing part of claim 1 solved.
  • the T-shaped block in longitudinal section, with the column, cone or pyramid shape round, oval or polygonal cross-section is dimensioned so that the shaft is damped and moves into the interior of the column in order to prevent it from reflecting on the free column wall and as an after-vibration comes out, which worsens the pulse quality. So it can further damping means are dispensed with.
  • the manufacture as Bulk items due to the elimination of additional damping agents and adhesive connections much easier.
  • the molding is essential for the invention of a covenant to the unit cell formation block.
  • Figure 1 shows the unit cell 1 in a perspective view. This exists from block 2 and the collar 3 formed on it. The collar protrudes above the Block out.
  • the unit cell 1 is in cross section Triangular shape, but it can also have any other shape. she can be round, oval or polygonal, and pointed towards the top as a cone or pyramid run.
  • One electrode 4 is on the straight exit surface of the pulse arranged, while the other electrode 5 laterally along the block 2nd extends. It is not necessary for the electrode 5 to be around the whole block walks around and not that the bottom electrode covers the entire bottom surface covered.
  • the thickness of the covenant is a, the height of the block is b, the width of the block marked with c and the total height of unit cell 1 with h.
  • the active one The unit cell area is in the lower part of the block and inside of the federal government. As already mentioned, the proportions of the unit cell are important. It has been shown that the thickness of the federal government in relation to the Height of the block of piezoelectric material to the total height, i.e. a / b / h im Keep ratio 1 / 4-6 / 10 for best results. optimal Results means that strong and short impulses are sent out and the Transducers have a high sensitivity. In Figure 2 is that with the invention Sound transducer reached pulse curve shown
  • the T-shape of unit cell 1 according to the invention is of very great importance, since it allows the electric field between the electrodes within the Unit cell is closed.
  • the image of the electric field is in of the unit cell. As can be seen from this, this only runs within the converter's unit cell. This shape also enables volume oscillation and all up s.
  • Fig. 1 directed waves, so against the impulse exit surface, propagating waves dampen so that they can no longer be reflected at the upper end of the unit cell.
  • the proportions of the unit cell are of great importance.
  • the ratio of the individual parts of the unit cell has already been specified Service.
  • the height of the cell h should be at least 10 times greater than the height of the To be federal a.
  • Such a converter produces Pulses that are 10 ns long and have a bandwidth of 4-35 as a receiver MHz.
  • the ultrasonic wave that goes up in the drawing, totally subdued.
  • the complete one Transducer does not have to be thicker than 2 mm. It is even possible to make it significant to make it thinner if the unit cell is designed to face up forms a peak which is sufficient for the wave going in this direction ahead of time attenuates.
  • the component in the selected proportions of the electric field that go to the base of unit cell 1, i.e. the Crossbar of the T is parallel, comparable to the component perpendicular to it.
  • the properties of the transducer according to the invention are only by Properties of the selected piezoelectric material and the precision of the Shape of the unit cell determined, d. H. in other words, the invention Transducers can be manufactured with very good repeatability.
  • converter This type can contain one or more unit cells that are connected to each other can be connected.
  • the converter according to the invention is capable of very short and very strong pulses to produce that cannot be achieved with other converter designs.
  • the amplitude of the pulses produced is at least twice that of the classic converters. Its sensitivity is with the classic constructions comparable.
  • the converter according to the invention can be used with considerably lower ones Produce costs and use them wherever classic types of converter can be used.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Surgical Instruments (AREA)

Claims (5)

  1. Transformateur d'impulsions sonores pour la région ultrasonore, destiné à une utilisation aussi bien en tant qu'émetteur qu'en tant que récepteur, avec un bloc élémentaire (2) en matériau piézoélectrique,
    caractérisé par le fait que la hauteur (h) du bloc élémentaire (2) en matériau piézoélectrique du transformateur est plus grande que la largeur (b) et que le bloc (2) se présente, à la sortie de l'onde sonore, sous la forme d'une ceinture (3) appropriément adaptée de façon qu'on obtienne une surface plane de sortie pour l'onde sonore et qu'en coupe longitudinale apparaisse une forme en T, la polarisation étant orientée verticalement par rapport à la surface de sortie, et que l'une électrode (4) est prévue dans la surface de sortie des impulsions pendant que l'autre (5) passe le long du bloc (2) au-dessus de la ceinture (3).
  2. Transformateur d'impulsions ultrasoniques selon la Revendication 1,
    caractérisé par le fait que le bloc (2) a la forme d'une colonne ronde ou polygonale, de cône ou de pyramide, et que la ceinture (3) est appropriément adaptée.
  3. Transformateur d'impulsions sonores selon la revendication 1 ou 2,
    caractérisé par le fait que la cellule élémentaire est choisie dans les proportions a/b/h = 1/(4-6)/10, avec a représentant l'épaisseur de la ceinture (3), b le diamètre ou la largeur du bloc (2) et h la hauteur de la cellule (1) entière.
  4. Transformateur d'impulsions sonores selon une ou plusieurs des revendications précédentes,
    caractérisé par le fait qu'après sa formation la cellule élémentaire (1) est soumise à une polarisation radiale supplémentaire par applicytion d'une tension élevée.
  5. Transformateur d'impulsions sonores selon les revendications 1 à 4,
    caractérisé par le fait que le transformateur est composé de plusieurs cellules élémentaires (1), des électrodes assignées aux cellules étant placées autour des colonnes ou autres corps allongés similaires, avec toutefois une seule électrode pour l'ensemble des cellules à la surface de sortie des impulsions.
EP00929375A 1999-04-19 2000-04-18 Transducteur acoustique a impulsions comprenant un bloc elementaire en materiau piezoceramique Expired - Lifetime EP1169143B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19917429A DE19917429A1 (de) 1999-04-19 1999-04-19 Impulsschallwandler
DE19917429 1999-04-19
PCT/EP2000/003489 WO2000062946A1 (fr) 1999-04-19 2000-04-18 Transducteur acoustique a impulsions comprenant un bloc elementaire en materiau piezoceramique

Publications (2)

Publication Number Publication Date
EP1169143A1 EP1169143A1 (fr) 2002-01-09
EP1169143B1 true EP1169143B1 (fr) 2004-12-22

Family

ID=7904937

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00929375A Expired - Lifetime EP1169143B1 (fr) 1999-04-19 2000-04-18 Transducteur acoustique a impulsions comprenant un bloc elementaire en materiau piezoceramique

Country Status (7)

Country Link
US (1) US6720715B1 (fr)
EP (1) EP1169143B1 (fr)
AT (1) ATE285302T1 (fr)
CA (1) CA2366956A1 (fr)
DE (2) DE19917429A1 (fr)
PL (1) PL351622A1 (fr)
WO (1) WO2000062946A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100927493B1 (ko) * 2001-11-02 2009-11-17 프로덕트 시스템즈 인코포레이티드 방사출력 메가소닉 변환기
US6984922B1 (en) * 2002-07-22 2006-01-10 Matsushita Electric Industrial Co., Ltd. Composite piezoelectric transducer and method of fabricating the same
JP4473532B2 (ja) * 2002-10-10 2010-06-02 日本碍子株式会社 圧電／電歪デバイス及び製造方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3271704A (en) * 1963-03-25 1966-09-06 Bell Telephone Labor Inc Ultrasonic delay device
DE2314420C3 (de) * 1973-03-22 1978-03-30 Siemens Ag, 1000 Berlin Und 8000 Muenchen Piezoelektrische Taste
US3891869A (en) * 1973-09-04 1975-06-24 Scarpa Lab Inc Piezoelectrically driven ultrasonic generator
SE455538B (sv) * 1985-12-06 1988-07-18 Tekniska Roentgencentralen Ab Ultraljudssond for provning av ett slitsat eller halforsett materialstycke
GB2225426B (en) * 1988-09-29 1993-05-26 Michael John Gill A transducer
WO1997016260A1 (fr) * 1995-11-02 1997-05-09 Sonident Anstalt Transducteur ultrasonore piezo-electrique
US5606297A (en) * 1996-01-16 1997-02-25 Novax Industries Corporation Conical ultrasound waveguide
US6777856B2 (en) * 2001-08-02 2004-08-17 Kistler Holding Ag Crystal element for piezo sensors

Also Published As

Publication number Publication date
CA2366956A1 (fr) 2000-10-26
DE19917429A1 (de) 2000-10-26
DE50009032D1 (de) 2005-01-27
US6720715B1 (en) 2004-04-13
WO2000062946A1 (fr) 2000-10-26
ATE285302T1 (de) 2005-01-15
EP1169143A1 (fr) 2002-01-09
PL351622A1 (en) 2003-05-19

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