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EP0838271B1 - Transducteur ultrasonore - Google Patents

Transducteur ultrasonore Download PDF

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Publication number
EP0838271B1
EP0838271B1 EP97117979A EP97117979A EP0838271B1 EP 0838271 B1 EP0838271 B1 EP 0838271B1 EP 97117979 A EP97117979 A EP 97117979A EP 97117979 A EP97117979 A EP 97117979A EP 0838271 B1 EP0838271 B1 EP 0838271B1
Authority
EP
European Patent Office
Prior art keywords
piezoelectric body
ultrasonic transducer
longitudinal direction
area
edge
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
EP97117979A
Other languages
German (de)
English (en)
Other versions
EP0838271A3 (fr
EP0838271A2 (fr
Inventor
Joachim Dipl.Ing. Ritter
Bernd Dipl.Ing. Rueckelt
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.)
IntelligeNDT Systems and Services GmbH and Co KG
Original Assignee
IntelligeNDT Systems and Services GmbH and Co KG
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 IntelligeNDT Systems and Services GmbH and Co KG filed Critical IntelligeNDT Systems and Services GmbH and Co KG
Publication of EP0838271A2 publication Critical patent/EP0838271A2/fr
Publication of EP0838271A3 publication Critical patent/EP0838271A3/fr
Application granted granted Critical
Publication of EP0838271B1 publication Critical patent/EP0838271B1/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
    • B06B1/0648—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 of rectangular shape
    • 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
    • G10K11/18—Methods or devices for transmitting, conducting or directing sound
    • G10K11/26—Sound-focusing or directing, e.g. scanning
    • 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
    • G10K11/18—Methods or devices for transmitting, conducting or directing sound
    • G10K11/26—Sound-focusing or directing, e.g. scanning
    • G10K11/32—Sound-focusing or directing, e.g. scanning characterised by the shape of the source

Definitions

  • the invention relates to an ultrasonic transducer a piezoelectric expanded in a longitudinal direction Body.
  • EP 0 688 610 A2 describes a wide-beam test head for the Ultrasonic testing technology known to suppress this Amplitude increase in the area of its narrow sides with a Hole or a side incision is provided.
  • the invention is based on the object of an ultrasonic transducer with one extended in a longitudinal direction Specify piezoelectric body in which an amplitude increase is largely suppressed at the oscillator ends.
  • an ultrasonic transducer contains one piezoelectric body extended in a longitudinal direction, which is provided in the edge area with a recess whose Depth is smaller than the thickness of the piezoelectric Body, so that its cross-sectional area is perpendicular to this longitudinal direction is smaller in an edge area than in a central area.
  • This measure is the active volume of the piezoelectric Body reduced in the area of the end faces, so that in an edge area the reception sensitivity and the of the electrical excitation generated across the entire width average vibration amplitude of the piezoelectric body is reduced.
  • a recess preferably a groove
  • an ultrasonic transducer contains one piezoelectric body extended in a longitudinal direction, the one on its flat sides, at least in its middle area each with a coherent electrically conductive Layer is provided on at least one of these flat sides the edge area adjacent to an end face Partial surface of the piezoelectric body covers. In this case, too, is in the edge area Reception sensitivity and that of electrical excitation generated on the entire width of the piezoelectric body related mean vibration amplitude reduced.
  • the ultrasound transducers reproduced in the independent patent claims is based on the idea in the marginal area of a piezoelectric vibrator extended in the longitudinal direction occurring acoustic exaggeration effects reduce that from the amplitude of the electric field, that with the electrical excitation of the transducer in the volume of the piezoelectric body is generated via the entire cross-sectional area integral formed in the edge area of the piezoelectric body is smaller than in the central area.
  • an ultrasonic transducer contains one in one Longitudinal direction 1 extended narrow piezoelectric body 2, preferably a piezoceramic body attached to its Flat sides with electrically conductive layers 6 and 8 is provided.
  • the electrode 8 covers in the illustrated embodiment the entire flat side of the piezoelectric Body 2.
  • the piezoelectric body 2 In the area of its perpendicular to the longitudinal direction 1 oriented end faces 10 and 12, i.e. in its edge area, is the piezoelectric body 2 each with one Provide recess. In the exemplary embodiment, this is a V-shaped Groove 14 and 16, respectively, in one of the two flat sides parallel to the end faces 10 and 12 of the piezoelectric Extend body 2.
  • the grooves 14 and 16 can be produced, for example, by sawing become. For technical reasons, it is advantageous the grooves 14 and 16 in the piezoelectric body 2 to bring after this with the conductive layer 6th is provided so that the conductive layer 6 spatially in three and electrically separated areas 6a, 6b and 6c is divided.
  • a cross-sectional area A R drawn in dashed lines perpendicular to the longitudinal direction 1 in the area of the groove 14 is smaller than a cross-sectional area A M also shown in dashed lines in the central area.
  • the actively oscillating volume of the piezoelectric body 2 is smaller in the edge region than in the center region.
  • This effect is reinforced by the fact that only the inner conductive layer 6b and the conductive layer 8 are activated as electrodes, so that when the piezoelectric body 2 is electrically excited, the amplitude of the electric field and thus also the vibration amplitude in the edge region is lower than in the central region ,
  • a further embodiment is shown in a side view in FIG shown in which a groove 18 in one and a further groove 20 in the opposite flat side of a piezoelectric body 22 are arranged.
  • the production the grooves 20, 18 preferably takes place after the Flat sides with electrically conductive layers 24 and 26 are coated.
  • Layers 24 and 26 are each electrically in two divided areas 24a and 24b or 26a and 26b, each of which is the conductive layers 24a and 26a starting from an inner edge of the groove 20 or 18 extend to the edge of the piezoelectric body 22.
  • a piezoelectric body 28 is provided, the one on a flat side in its edge area with a groove 30 and 32 provided with a rectangular cross section is.
  • too Flat side three electrically and spatially separated electrically conductive layers 6a, 6b and 6c are formed.
  • a piezoelectric Body 34 in its front edge areas each provided with a recess 36, starting from a dashed drawn basic body with rectangular flat sides for example by sawing off the corners is so that the piezoelectric body 34 is a hexagonal, honeycomb-like shape.
  • FIG. 5 is an oval piezoelectric Body 38 shown, in which recesses 40th provided in the edge area, which are rounded.
  • Such rounded Recesses 40 can by etching the corners of a also shown in dashed lines with a rectangular body Cross section can be produced.
  • the removal takes place at already coated with an electrically conductive layer 45 piezoelectric body 42 only up to its surface, d. H. up to one of the layer thickness D of this layer 45, so that in this area the recess 44 only through a complete removal of the electrically conductive layer 45 is formed.
  • an electrically conductive layer 45 piezoelectric body 42 only up to its surface, d. H. up to one of the layer thickness D of this layer 45, so that in this area the recess 44 only through a complete removal of the electrically conductive layer 45 is formed.
  • a partial area of the end faces 102 and 122 adjacent edge region of the piezoelectric Body 42 of the electrically conductive layer 45 covered.
  • a zone is formed that is not one of them electrically conductive layer is covered.
  • an electrically conductive layer 48 on a flat side of a piezoelectric body 46 each in the edge area provided a groove 50 which is only up to the surface of the piezoelectric body 46 extends and the electrical conductive layer 48 in three electrically and spatially apart divides separate areas 48a, 48b and 48c.
  • the middle electrically conductive layer 48b extends analogously for the exemplary embodiment according to FIG. 1 not up to the end faces 52, 54 and therefore does not cover the entire flat side of the piezoelectric body 46.
  • the immediately below volumes located in the electrical layers 48a and 48c of the piezoelectric body 46 is thus both in the receiving as well as not or at least not immediately in the case of transmission active when the received signal comes about or involved in the transmitted ultrasonic wave.
  • the curve a is the sensitivity of a Ultrasonic transducer according to that explained in more detail with reference to Figure 1 Embodiment against itself in its longitudinal direction extending coordinate x plotted.
  • This Curve shape a is measured when the ultrasonic transducer successively over a stationary in a test object, echo generating interferer is moved away. If the ultrasound transducer with its edge on the narrow side the mistake Once reached, the level of the echo pulse begins to rise steeply, then reaches a plateau and falls in the area the opposite edge of the transducer steeply.
  • a curve b is also entered for comparison, which with an ultrasonic transducer known from the prior art same dimensions. It can be spotted, that there is a dashed cant b, almost in the ultrasonic transducer according to the invention is completely eliminated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Mechanical Engineering (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Claims (5)

  1. Transducteur ultrasonore comprenant un corps (2, 22, 28, 42) piézoélectrique s'étendant dans une direction (1) longitudinale et muni dans la partie du bord d'un évidement (14, 16, 18, 20, 30, 32, 44) dont la profondeur (t) est plus petite que l'épaisseur (h) du corps (2) piézoélectrique de sorte que sa surface (Ar, Am) de section transversale perpendiculairement à cette direction (1) longitudinale est plus petite dans une partie du bord du corps que dans une partie du milieu.
  2. Transducteur ultrasonore suivant la revendication 1, dans lequel il est prévu comme évidement une rainure (14, 16, 18, 20, 30, 32).
  3. Transducteur ultrasonore suivant la revendication 2, dans lequel la rainure (14, 16, 30, 32) est disposée sur une face plate du corps (2, 28) piézoélectrique.
  4. Transducteur ultrasonore suivant la revendication 1, dans lequel l'évidemment (36, 40, 44) est prévu aux coins du corps (34, 38, 42) piézoélectrique.
  5. Transducteur ultrasonore ayant un corps (2, 22, 28, 42, 46) piézoélectrique s'étendant dans une direction (1) longitudinale et muni sur ses faces plates au moins dans sa partie du milieu respectivement d'une couche (6b, 24a, 24b, 45, 48b) conductrice de l'électricité d'un seul tenant qui, au moins sur l'une de ses faces plates, ne recouvre que partiellement la partie du bord, voisine d'une surface (10, 12, 102, 122) frontale ,de la surface du corps (2, 22, 28, 42, 46) piézoélectrique.
EP97117979A 1996-10-28 1997-10-16 Transducteur ultrasonore Expired - Lifetime EP0838271B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19644762 1996-10-28
DE19644762 1996-10-28

Publications (3)

Publication Number Publication Date
EP0838271A2 EP0838271A2 (fr) 1998-04-29
EP0838271A3 EP0838271A3 (fr) 2000-07-19
EP0838271B1 true EP0838271B1 (fr) 2004-01-07

Family

ID=7810215

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97117979A Expired - Lifetime EP0838271B1 (fr) 1996-10-28 1997-10-16 Transducteur ultrasonore

Country Status (2)

Country Link
EP (1) EP0838271B1 (fr)
DE (1) DE59711179D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101279318A (zh) * 2007-04-06 2008-10-08 广州市新栋力超声电子设备有限公司 一种超声弯曲振动装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3485904B2 (ja) * 2001-04-24 2004-01-13 松下電器産業株式会社 音響変換器

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3094717B2 (ja) * 1993-02-09 2000-10-03 株式会社村田製作所 圧電共振部品
US5481154A (en) * 1993-09-28 1996-01-02 Murata Manufacturing Co., Ltd. Piezo-resonator
DE59504040D1 (de) * 1994-06-21 1998-12-03 Krautkraemer Gmbh Breitstrahlprüfkopf für die Ultraschallprüftechnik

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101279318A (zh) * 2007-04-06 2008-10-08 广州市新栋力超声电子设备有限公司 一种超声弯曲振动装置
CN101279318B (zh) * 2007-04-06 2011-01-26 广州市新栋力超声电子设备有限公司 一种超声弯曲振动装置

Also Published As

Publication number Publication date
EP0838271A3 (fr) 2000-07-19
DE59711179D1 (de) 2004-02-12
EP0838271A2 (fr) 1998-04-29

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