EP0655156B1 - Ultraschallwandler - Google Patents

Ultraschallwandler Download PDF

Info

Publication number
EP0655156B1
EP0655156B1 EP93917707A EP93917707A EP0655156B1 EP 0655156 B1 EP0655156 B1 EP 0655156B1 EP 93917707 A EP93917707 A EP 93917707A EP 93917707 A EP93917707 A EP 93917707A EP 0655156 B1 EP0655156 B1 EP 0655156B1
Authority
EP
European Patent Office
Prior art keywords
ultrasonic transducer
matching element
notch
transducer according
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.)
Expired - Lifetime
Application number
EP93917707A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0655156A1 (de
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/de
Publication of EP0655156A1 publication Critical patent/EP0655156A1/de
Application granted granted Critical
Publication of EP0655156B1 publication Critical patent/EP0655156B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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, disk-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 adapter 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 ultrasonic transducer.
  • the document also shows that even small changes in shape of the peripheral wall of the adapter body can change the vibrations considerably.
  • a straight line is specified as the configuration of the side line of the peripheral 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 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 about half the radius and drops steeply towards the edge. This form of vibration results in losses in the attainable sound pressure and the associated sound lobe shapes have clear side lobes that can lead to malfunctions and malfunctions in practical use.
  • the object of the invention to provide an ultrasonic transducer of the type mentioned above, in which, with a small design and due to an improved waveform, high sound pressure is achieved with as little loss as possible and in which the side lobe suppression is better than - 30 dB.
  • the ⁇ / 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 particularly suitable for industrial use with good acoustic properties and for operation in the ambient medium air.
  • the circumferential surface outside of the incision has a circular cylindrical contour.
  • the incision is subsequently milled into the peripheral surface, for example, in a disk-shaped, circular-cylindrical adaptation body that is easy to produce.
  • the circumferential surface has an incision of at least such a depth that, in the case of unevenly sized circular surfaces on the top and bottom of the ⁇ / 4 adaptation body, the smaller one projected into it Circular surface outgoing cylinder jacket surface intersects.
  • the piezoelectric transducer element has a main surface of diameter D in the direction of the main radiation of the ultrasonic vibrations and the underside circular surface of the ⁇ / 4 adapter body facing it has a diameter of between 0.9 D and 1.2 D
  • the Varying this parameter in conjunction with the shape and depth of the incision enables a particularly effective form of vibration.
  • 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 adapter 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 unchanged, which has the advantage of being easy to clean if the transducer is contaminated, as well as having an optically better appearance.
  • the foam covering is made of polyurethane, the elastic damping of the ultrasound 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 up to a maximum of half the thickness 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 ⁇ / 4 adaptation body 2 over its circular surface 8 on its underside.
  • the diameter d s of the adaptation body 2 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 , modulus of elasticity 2150 N / mm 2 and a transverse contraction of 0.285.
  • the sound lobe shape according to FIG. 2 results, 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.
  • This extraordinarily favorable behavior is due to the profiling of the cylinder jacket surface, which results in a vibration mode with an almost ideal vibration amplitude distribution on the radiation surface of the ⁇ / 4 adaptation body 2 according to FIG. 3.
  • the incision 4 in the ⁇ / 4 adaptation body 2 is groove-shaped, 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 has an influence on the the vibration shape has the optimal shape and position of the groove 4.
  • the incision 4 in the peripheral 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 radiating 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 into the circumferential surfaces 3 of circular-cylindrical or conical disks as an adaptation body 2, the diameter of which 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 of the adaptation 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.
  • the converters with optimized lateral incisions as shown in FIG. 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 distribution of vibrations also increases the degree of transmission, ie the ratio between the voltage 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 converter 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 depressions 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.
  • the radiation behavior of the ultrasonic transducer can be influenced not only by contours on the peripheral surface 3 of the adaptation body 2, but also by incisions 9, 10, 11 on its rear surface 8 facing the piezoceramic, as shown in FIGS. 7 and 8 be improved.
  • a cylindrical recess 9 is provided on the rear surface 8.
  • the incisions on the rear surface 8 of the adapter body 2 are in the form of concentric, annular grooves 10, 11.
  • a particularly favorable radiation behavior can be achieved by combining side and rear profiles of the adapter body.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Transducers For Ultrasonic Waves (AREA)
EP93917707A 1992-08-13 1993-07-29 Ultraschallwandler Expired - Lifetime EP0655156B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP93917707A EP0655156B1 (de) 1992-08-13 1993-07-29 Ultraschallwandler

Applications Claiming Priority (4)

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

Publications (2)

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

Family

ID=8209913

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93917707A Expired - Lifetime EP0655156B1 (de) 1992-08-13 1993-07-29 Ultraschallwandler

Country Status (5)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19630350A1 (de) * 1996-07-26 1998-01-29 Siemens Ag Ultraschallwandler

Families Citing this family (9)

* 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
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 (de) 2019-03-22 2021-05-12 Sonotec Ultraschallsensorik GmbH Ultraschallwandler mit einer strukturierten ankoppelschicht
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 (de) * 1989-04-05 1991-10-09 CRAIGIE, Neil S., Dr. Ultraschallwandler
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

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19630350A1 (de) * 1996-07-26 1998-01-29 Siemens Ag Ultraschallwandler
WO1998004361A1 (de) * 1996-07-26 1998-02-05 Siemens Aktiengesellschaft Ultraschallwandler mit scheibenförmigen viertelwellenlängen-anpassungskörper
DE19630350C2 (de) * 1996-07-26 1998-08-20 Siemens Ag Ultraschallwandler
US6104121A (en) * 1996-07-26 2000-08-15 Siemens Ag Ultrasonic transducer with a disk-shaped quarter wave length transformer

Also Published As

Publication number Publication date
EP0655156A1 (de) 1995-05-31
DE59303034D1 (de) 1996-07-25
JPH08500224A (ja) 1996-01-09
US5659220A (en) 1997-08-19
JP3148242B2 (ja) 2001-03-19
WO1994005004A1 (de) 1994-03-03

Similar Documents

Publication Publication Date Title
EP0840655B1 (de) Ultraschallwandler
DE2318027C3 (de) Elektroakustischer Wandler mit einem piezoelektrischen Biegeschwinger
EP0655156B1 (de) Ultraschallwandler
DE2937942A1 (de) Ultraschallwandler
DE2913957B2 (de) Piezoelektrischer Lautsprecher
EP0308899A2 (de) Ultraschallwandler mit astigmatischer Sende-/Empfangscharakteristik
DE4231253A1 (de) Membran fuer elektrodynamische wandler
EP0615471B1 (de) Schall- oder ultraschallwandler
EP0914215B1 (de) Ultraschallwandler mit scheibenförmigen viertelwellenlängen-anpassungskörper
DE2709374A1 (de) Elektroakustischer wandler
WO1999010874A1 (de) Schallwandler
EP0904161B1 (de) Ultraschallwandler
EP1283516B1 (de) Ultraschallwandler mit einer zur Schwingung anregbaren Membran und mit einem auf der Membranfläche angeordneten Piezoschwinger
DE3622558C2 (ja)
DE19750179A1 (de) Schallwandler
DE4423639C2 (de) Ultraschallwandler zum Abstrahlen und/oder Empfangen von Ultraschallwellen in gasförmigen Medien
EP0838271B1 (de) Ultraschallwandler
DE2831326A1 (de) Elektroakustischer wandler
DE3933519A1 (de) Vorrichtung zur reinigung von gegenstaenden mit ultraschall
EP0390959A2 (de) Ultraschallwandler
DE3911047A1 (de) Ultraschallwandler
DE102022119465A1 (de) Gehäuse für ultraschallwandler mit unterschiedlich geneigten bodenflächen
DE3622526C2 (ja)
EP0307799A2 (de) Dämpfkörper für Ultraschall-Impulssonden
DE3941749A1 (de) Piezoelektrischer, elektroakustischer wandler

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

17P Request for examination filed

Effective date: 19950103

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): CH DE FR GB IT LI

17Q First examination report despatched

Effective date: 19951107

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): CH DE FR GB IT LI

REG Reference to a national code

Ref country code: CH

Ref legal event code: NV

Representative=s name: SIEMENS SCHWEIZ AG

REF Corresponds to:

Ref document number: 59303034

Country of ref document: DE

Date of ref document: 19960725

ITF It: translation for a ep patent filed

Owner name: STUDIO JAUMANN

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19960829

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19961017

Year of fee payment: 4

ET Fr: translation filed
ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

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

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19970731

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19970731

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

REG Reference to a national code

Ref country code: GB

Ref legal event code: 732E

Free format text: REGISTERED BETWEEN 20110217 AND 20110223

REG Reference to a national code

Ref country code: FR

Ref legal event code: TP

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20120710

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20120725

Year of fee payment: 20

Ref country code: DE

Payment date: 20120726

Year of fee payment: 20

Ref country code: FR

Payment date: 20120802

Year of fee payment: 20

REG Reference to a national code

Ref country code: DE

Ref legal event code: R071

Ref document number: 59303034

Country of ref document: DE

REG Reference to a national code

Ref country code: GB

Ref legal event code: PE20

Expiry date: 20130728

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20130730

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20130728