EP0655156A1 - Transducteur ultrasonore. - Google Patents

Transducteur ultrasonore.

Info

Publication number
EP0655156A1
EP0655156A1 EP93917707A EP93917707A EP0655156A1 EP 0655156 A1 EP0655156 A1 EP 0655156A1 EP 93917707 A EP93917707 A EP 93917707A EP 93917707 A EP93917707 A EP 93917707A EP 0655156 A1 EP0655156 A1 EP 0655156A1
Authority
EP
European Patent Office
Prior art keywords
ultrasonic transducer
incision
transducer according
adaptation
depth
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.)
Granted
Application number
EP93917707A
Other languages
German (de)
English (en)
Other versions
EP0655156B1 (fr
Inventor
Rudolf Thurn
Klaus Busch
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 EP93917707A priority Critical patent/EP0655156B1/fr
Publication of EP0655156A1 publication Critical patent/EP0655156A1/fr
Application granted granted Critical
Publication of EP0655156B1 publication Critical patent/EP0655156B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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 piezoelectric transducer element, which is provided with a rotationally symmetrical, disc-shaped ⁇ / 4 adaptation body.
  • An ultrasonic transducer of the type mentioned above is known from DE-PS 39 11 047.
  • the vibrations are influenced by small changes in the diameter of the main surface of the adaptation body, based on the diameter of the piezoceramic transducer element, in order to improve its efficiency and its radiation characteristic with small dimensions of the ultrasound transducer.
  • the print can also be seen that even small changes in the shape of the peripheral wall of the adapter body can significantly change the vibrations.
  • a straight line is specified as the configuration of the side line of the circumferential surface, which diverges or converges, so that the diameter of the main surface of the adapter body deviates slightly from the main surface of the piezoceramic transducer element.
  • Slightly positive or slightly negative curved side lines are also considered to be advantageous depending on the thickness of the adaptation body and the diameter of the transducer element in order to achieve a relatively centered high sound pressure.
  • the resulting amplitude distribution has a relative minimum in the central area of the radiation area. The amplitude increases in the radial direction, has its maximum at approximately half the radius and falls steeply towards the edge. This form of vibration results in losses in the attainable sound pressure and associated sound cone shapes have significant side ⁇ to cull that can lead functions in practice to disturbances and Friedfunk ⁇ .
  • the invention has for its object to provide an Ultra ⁇ sound transducers of the above type, in which with a small design due to an improved waveform with the least possible loss of a high sound pressure he ⁇ ranges and in which the side lobe suppression better than - 30 dB.
  • the A / 4 adaptation body has an incision on its peripheral surface and / or on its rear surface facing the transducer element. A particularly good radiation behavior is achieved if the incision has a depth of up to a quarter of the disk diameter of the adapter body .
  • Such ultrasonic transducers are forlot ⁇ len use with good acoustic properties and the Be ⁇ floating in the air surrounding medium particularly suitable.
  • the peripheral surface has a circular cylindrical contour outside the incision.
  • it is shaped in a simple to produce slices ⁇ circular cylindrical undsk ⁇ rper the notch later in the order circumferential surface z. B. milled in.
  • the order circumferential surface a notch at least of such Tie fe in that this at un ⁇ equally large circular surfaces at the top and underside of the ⁇ / O matching element which in this hineinproj ied gedach ⁇ te, of smaller circumferential surface intersecting cylinder surface.
  • the piezoelectric transducer element has a main face of the diameter D in the direction Kleinabstrah- development of the ultrasonic vibrations and has the this to ⁇ facing underside circular surface of the / 4 matching element has a diameter between 0, 9 D and 1, 2, D, is in the Variation of this parameter in connection with the shape and depth of the incision enables a particularly effective vibration shape.
  • the effect of the incision with regard to the acoustic properties is particularly good if the depth of the incision is 0.05-0.15 from the disk diameter of the adaptation body. If the entire ultrasound transducer is provided with a foam covering without the side of the adaptation layer facing the sonicating medium, this also prevents contamination in the area of the incision with the depressions and corners.
  • the front surface of the ultrasound transducer remains flat, which has the advantage of good cleanability when the transducer is dirty and its optically better appearance.
  • the foam covering is made of polyurethane, the elastic damping of the ultrasonic transducer which is primarily aimed at with this foam covering is extremely good.
  • an embodiment in which the incision on the rear surface of the adapter body is designed as a cylindrical recess is particularly favorable with regard to the radiation characteristic and is simple to manufacture.
  • An equally effective and simple alternative is when the incision on the rear surface of the adapter body is in the form of concentric, annular grooves with a depth of up to a maximum of half the thickness of the adapter body.
  • FIG. 1 shows an ultrasonic transducer according to the invention in section
  • FIG. 2 shows the shape of the acoustic lobe of the ultrasonic transducer according to FIG. 1
  • FIG. 3 shows the shape of the vibration on the radiation surface of the ultrasonic transducer according to FIG. 1
  • FI G 4 is an ultrasonic transducer with a rectangular incision on the circumferential surface
  • FIG. 5 is an ultrasonic transducer with a trapezoidal incision on the peripheral surface
  • FI G 6 is an ultrasonic transducer with a triangular incision
  • FI G 7 is an ultrasonic transducer with a cylindrical recess on the rear surface of the adapter body
  • FI G 8 is an ultrasonic transducer with annular grooves on the rear surface of the adapter body.
  • the piezoceramic 1 shows an ultrasonic transducer according to the invention with a disk-shaped piezoceramic 1, which is glued over its main surface 7 to a rotationally symmetrical, disk-shaped t / 4 adaptation body 2 over its circular surface 8 on its underside.
  • the circular-cylindrical t ⁇ / 4 adaptation body 2 has a rectangular groove 4 on its peripheral surface 3 a depth 5 from
  • the diameter d of the adaptation body 2 s consisting of syntactic foam corresponds to that of the piezoceramic 1.
  • the adaptation body 2 has the following material data: density 580 kg / m 3 , elastic modulus 2150 N / mm * and a transverse contraction of 0.285.
  • the ultrasonic transducer according to FIG. 1 results in the sound lobe shape according to FIG. 2, which can be described as practically free of side lobes, since only side lobes with a vibration amplitude reduced by more than -30 dB compared to the main lobe occur.
  • the incision 4 in the ⁇ / 4 adaptation body 2 is groove-shaped as well as in FIG. 1, but here the underside circular surface 8 of the adaptation body 2 projects beyond the main surface 7 of the piezoceramic 1, which means that Influence on the optimal shape and position of the groove 4 with respect to the vibration shape.
  • the incision 4 in the circumferential surface 3 of the circular cylindrical / 4-adaptation body 2 is trapezoidal.
  • the lateral surface of the adaptation body 2, into which the incision 4 is incorporated, can also have a conical side line. This shows e.g. 6, where the incision 4 is triangular and the emitting surface has a larger diameter than the surface of the adapter body glued to the piezoceramic 1.
  • the incisions 4 can have a polygonal design or can also be designed as round recess shapes. They can be incorporated in the circumferential surfaces 3 of circular-cylindrical or conical disks as adaptation bodies 2, their diameters on the bonding surface with the piezoceramic of diameter D is preferably between 0.9 x D and 1.2 x D.
  • the exact geometry of the profiling which results in the optimal waveform according to FIG. 3, depends on the mechanical material data and external dimensions of the piezoelectric transducer element 1 and the adapter body 2, which also predetermines the order of magnitude of the desired operating frequency. It must be readjusted and optimized for every combination of material data and external dimensions as well as for the desired deflection shape.
  • a narrow sound beam without side lobes is advantageous.
  • an amplitude distribution in the form of a Gaussian bell curve can be generated on the radiation surface with a maximum deflection in the center of the radiation surface and a continuously decreasing amplitude towards the edge.
  • the Gauss curve is the form of deflection that leads to sound beams that are completely free of side lobes.
  • the converters with optimized lateral incisions as shown in FI G 2, have extremely weak side lobes.
  • a side lobe suppression of -30 to -40 dB can be achieved.
  • Gaussian curves with different slope can be created, which simultaneously changes the - 3 dB width of the main sound lobe.
  • a steep drop corresponds to a wider club, a flatter curve, however, a very narrow club.
  • the opening angles that can be set are between about 8 * and 25 ".
  • the Gaussian, in-phase vibration distribution also increases the transmission factor, i.e. the ratio between the chip of the received echo signal to the associated transmission voltage at a certain distance, by up to a factor of 5 compared to an identical transducer without this lateral profiling.
  • the ultrasonic sensor is embedded in elastic damping material, preferably polyurethane, which at the same time prevents contamination of the lateral contour with its recesses and corners in the area of the incisions.
  • ultrasonic transducers with almost ideal, i.e.. Side-beam-free radiation characteristics can be easily produced in a small design. This is achieved using conventional components for ultrasonic transducers by profiling the circumferential surface of the adapter body by means of an incision suitable in shape and depth.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Transducers For Ultrasonic Waves (AREA)

Abstract

Pour des applications industrielles, il existe une demande de transducteurs ultrasonores compacts caractérisés en même temps par un rayonnement pauvre en lobes secondaires. Cette exigence est satisfaite avec un transducteur ultrasonore de conception classique qui comprend un élément transducteur piézoélectrique (1) qui comprend collé sur sa surface principale (7), un corps d'adaptation lambda/4 (2) en forme de disque, la surface circonférentielle du corps d'adaptation lambda/4 (2) étant pourvue, selon l'invention, d'une encoche (4) de profondeur appropriée (5).
EP93917707A 1992-08-13 1993-07-29 Transducteur ultrasonore Expired - Lifetime EP0655156B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP93917707A EP0655156B1 (fr) 1992-08-13 1993-07-29 Transducteur ultrasonore

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP92113833 1992-08-13
EP92113833 1992-08-13
EP93917707A EP0655156B1 (fr) 1992-08-13 1993-07-29 Transducteur ultrasonore
PCT/EP1993/002039 WO1994005004A1 (fr) 1992-08-13 1993-07-29 Transducteur ultrasonore

Publications (2)

Publication Number Publication Date
EP0655156A1 true EP0655156A1 (fr) 1995-05-31
EP0655156B1 EP0655156B1 (fr) 1996-06-19

Family

ID=8209913

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93917707A Expired - Lifetime EP0655156B1 (fr) 1992-08-13 1993-07-29 Transducteur ultrasonore

Country Status (5)

Country Link
US (1) US5659220A (fr)
EP (1) EP0655156B1 (fr)
JP (1) JP3148242B2 (fr)
DE (1) DE59303034D1 (fr)
WO (1) WO1994005004A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19527018C1 (de) * 1995-07-24 1997-02-20 Siemens Ag Ultraschallwandler
DE19623071C2 (de) * 1996-06-10 1998-07-09 Siemens Ag Ultraschallwandler
DE19630350C2 (de) * 1996-07-26 1998-08-20 Siemens Ag Ultraschallwandler
JP3324593B2 (ja) * 1999-10-28 2002-09-17 株式会社村田製作所 超音波振動装置
DE10216037A1 (de) * 2002-04-11 2003-10-23 Endress & Hauser Gmbh & Co Kg Schall-oder Ultraschallsensor
KR100632480B1 (ko) * 2004-11-18 2006-10-16 황경환 콘덴서 스피커
US7775110B2 (en) * 2006-09-22 2010-08-17 Denso Corporation Ultrasonic sensor
JP7161423B2 (ja) * 2019-02-20 2022-10-26 京セラ株式会社 超音波センサ
EP3712607B1 (fr) 2019-03-22 2021-05-12 Sonotec Ultraschallsensorik GmbH Transducteur ultrasonore doté d'une couche de couplage structurée
JP2023122410A (ja) * 2022-02-22 2023-09-01 学校法人日本大学 超音波投射装置

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE852467C (de) * 1939-10-20 1952-10-16 Siemens Ag Einrichtung zur Erzeugung von Schallschwingungen, insbesondere Ultraschallschwingungen
US2728869A (en) * 1950-01-06 1955-12-27 Ultraschall A G Piezoelectric oscillator or vibrator for ultrasonic waves, especially as an instrument for therapeutical treatment and diagnosis
US2875354A (en) * 1954-01-29 1959-02-24 Branson Instr Piezoelectric transducer
US3421031A (en) * 1966-11-23 1969-01-07 United Aircraft Corp Monocrystalline directional sonic transducer
US3718898A (en) * 1971-12-13 1973-02-27 Us Navy Transducer
DE2547759C3 (de) * 1975-10-24 1985-08-08 Endress U. Hauser Gmbh U. Co, 7867 Maulburg Schall-Echolot für die Messung von Füllständen
US4217684A (en) * 1979-04-16 1980-08-19 General Electric Company Fabrication of front surface matched ultrasonic transducer array
AU544464B2 (en) * 1982-12-27 1985-05-30 Tokyo Shibaura Denki Kabushiki Kaisha Ultrasonic transducer
DE3501808A1 (de) * 1985-01-21 1986-07-24 Siemens AG, 1000 Berlin und 8000 München Ultraschallwandler
DE3611669A1 (de) * 1985-04-10 1986-10-16 Hitachi Medical Corp., Tokio/Tokyo Ultraschallwandler
DE3911047A1 (de) * 1989-04-05 1990-10-11 Pepperl & Fuchs Ultraschallwandler
EP0390959A3 (fr) * 1989-04-05 1991-10-09 CRAIGIE, Neil S., Dr. Transducteur ultrasonique
DE4230773C2 (de) * 1992-09-15 2000-05-04 Endress Hauser Gmbh Co Ultraschallwandler
US5452267A (en) * 1994-01-27 1995-09-19 Magnetrol International, Inc. Midrange ultrasonic transducer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9405004A1 *

Also Published As

Publication number Publication date
JPH08500224A (ja) 1996-01-09
EP0655156B1 (fr) 1996-06-19
US5659220A (en) 1997-08-19
DE59303034D1 (de) 1996-07-25
JP3148242B2 (ja) 2001-03-19
WO1994005004A1 (fr) 1994-03-03

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