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WO2000079513A1 - Dispositif de fixation amortisseur destine au boitier d'un transducteur d'ultrasons et procede de fabrication dudit dispositif - Google Patents

Dispositif de fixation amortisseur destine au boitier d'un transducteur d'ultrasons et procede de fabrication dudit dispositif Download PDF

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Publication number
WO2000079513A1
WO2000079513A1 PCT/DE2000/001184 DE0001184W WO0079513A1 WO 2000079513 A1 WO2000079513 A1 WO 2000079513A1 DE 0001184 W DE0001184 W DE 0001184W WO 0079513 A1 WO0079513 A1 WO 0079513A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
ultrasonic transducer
holder
side walls
elastomer
Prior art date
Application number
PCT/DE2000/001184
Other languages
German (de)
English (en)
Inventor
Martin Heinz
Thomas Hahn
Original Assignee
Fraunhofer Gesellschaft zur Förderung der angewandten Forschung e.V.
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 Fraunhofer Gesellschaft zur Förderung der angewandten Forschung e.V. filed Critical Fraunhofer Gesellschaft zur Förderung der angewandten Forschung e.V.
Publication of WO2000079513A1 publication Critical patent/WO2000079513A1/fr

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
    • G10K11/004—Mounting transducers, e.g. provided with mechanical moving or orienting device

Definitions

  • the invention relates to an ultrasonic transducer, 5 in particular for carrying out measurements in
  • the ultrasonic transducer must be used for measurements in tubular bodies, on the inner tube wall or in an opening in the
  • a holder is usually provided, which is firmly connected to the tube and holds the ultrasonic transducer in a fixed position. In many measuring arrangements, however, along a measuring section, in the present
  • the structure-borne noise has a particularly disruptive effect, particularly in measurements in gases in which high sensitivity is important due to the low sound transmission in gases.
  • effective structure-borne noise decoupling of the ultrasound transducer from the fastening medium, for example the pipe wall is particularly important.
  • the decoupling is generally brought about by the connecting medium between the converter housing and the holder carrying this housing.
  • an ultrasonic transducer with a housing with a bottom wall and side walls and a ceramic transducer on the bottom wall of the housing is known.
  • a plastic matching layer is provided between the bottom wall and the ceramic transducer.
  • the remaining free space of the housing is filled with a plastic damping layer made of a silicone elastomer of high density with a high proportion of metal oxide to dampen the ceramic transducer. This is intended to enable the damping layer to be applied mechanically during the manufacture of the ultrasound transducer.
  • the damping layer within the converter housing is used in this converter to shorten the swing-out time in order to reduce the so-called blocking distance of the converter.
  • this arrangement has the disadvantage that the rubber material of the O-ring must have a minimum hardness to ensure a secure alignment of the ultrasonic transducer in the holder, which in turn only partially allows structure-borne noise decoupling. Furthermore, with this arrangement, water can settle on the transducer housing and the O-ring during measurements in air or in gases with a high moisture content, which creates a new structure-borne noise bridge between the transducer housing and the holder, so that the decoupling effect of the O- Part of the ring does not come into play.
  • the ultrasonic transducer consists in the usual way of a housing with a bottom wall and side walls and a transducer body which is arranged on an inner surface of the bottom wall.
  • the housing can have a pot-shaped shape, for example.
  • the bottom wall is preferably designed as a ⁇ / 4 adaptation layer for the ultrasonic wave range used.
  • the transducer body itself usually consists of a piezoelectric disk, for example a piezoceramic, which is glued to the bottom wall.
  • the housing is arranged in a holder which is connected to the outer surfaces of the side walls at least in a rear region of the housing spaced apart from the bottom wall.
  • the holder itself can have a tubular shape, for example.
  • the connecting element consists of an elastomer cast between the side walls of the housing and the holder, which engages in one or more projections or depressions which are provided on the outer surfaces of the side walls and on the boundary surfaces of the holder opposite these.
  • the elastomer is not only provided in the space between the side walls and the holder, but covers the rear area of the Complete housing, as can be seen for example in Figures 1 and 3 of the embodiment.
  • the design of the connecting element as an elastomer cast between the housing and the holder enables the ultrasound transducer to be reliably aligned relative to the holder. Due to the one or more projections or depressions on the outer surfaces of the housing or the inner surfaces of the holder, a mutual fixation between the housing, elastomer and holder is achieved, which prevents the individual elements from shifting relative to one another. Pouring in the elastomer enables a good intervention in the
  • a particular advantage of the ultrasonic transducer according to the invention is that an elastomer with a Shore hardness of less than 50 Shore A, preferably between 10 and 40 Shore A, can be used without endangering the safe transducer alignment within the holder. Especially with such soft elastomers, very good damping in the airborne sound area can be achieved and thus excellent
  • the elastomer is cast in only in a rear region of the housing between the holder and the side walls of the housing and the remaining space in the front region with PU or filled with silicone foam of low to medium density. This achieves an even better decoupling of the structure-borne noise from the holder.
  • the PU or silicone foam can be foamed or glued in the form of one or more prefabricated bodies.
  • the projections and / or depressions on the outer wall of the housing or the inner wall of the holder preferably do not have a rectangular cross-sectional shape.
  • the cross-sectional shape is rather chosen so that no air bubbles get caught on the projections or depressions when the elastomer is poured in.
  • the edges of these cross-sectional shapes are preferably beveled and horizontal surfaces which hinder the rise of the air bubbles are avoided.
  • the method according to the invention for producing the ultrasonic transducer uses a suitable mold for pouring the elastomer between the housing and the holder.
  • the housing of the ultrasonic transducer with the transducer body and associated electrical contacts located therein is manufactured in the usual way.
  • the depressions and projections on the housing can be suitably designed potting mold, into which the housing is cast, can be realized.
  • the shape required for the pouring of the elastomer has recesses in order to fix the housing and the holder in the required relative position to one another.
  • the shape extends in the space between the holder and the side walls of the housing to a height from the bottom of the housing to which the elastomer is to extend from the rear of the housing. In this way, a space remains from the back of the housing to the mold, which is filled with the elastomer.
  • the elastomer is filled in so far that the back of the housing is completely covered. After the pourable elastomer has solidified, the mold is removed.
  • a PU or silicone foam can then be filled into the remaining space between the side walls of the housing and the holder, which was previously taken up by the mold.
  • the holder does not have to extend to the bottom area of the housing, but can also only enclose the rear area of the housing.
  • the appropriate shape for pouring the elastomer is adapted accordingly.
  • Figure 2 shows an arrangement with a corresponding shape for producing the ultrasonic transducer of Figure 1;
  • FIG. 3 shows another example of an ultrasonic transducer according to the invention.
  • FIG. 4 shows an example of a mold for producing the ultrasound transducer according to FIG. 3.
  • FIG. 1 shows an example of an ultrasonic transducer according to the present invention.
  • the ultrasonic transducer consists of the housing 3 with a transducer body 1 designed as a piezoelectric disk, which is attached to the bottom surface of the pot-shaped housing 3 by means of an adhesive layer 2.
  • the bottom surface can be designed as a ⁇ / 4 adaptation layer.
  • the converter body 1 preferably consists of a piezo ceramic.
  • the two main surfaces of the piezoceramic 1 are provided in the usual way with electrodes, which are controlled via the contact wires 4.
  • a damping layer 5 is provided on the back of the piezoceramic 1, which completely fills the interior of the housing.
  • the damping layer 5 consists of known damping materials for ultrasound.
  • the converter housing 3 is arranged in a holder 8 and connected to this via the connecting element 6, a cast elastomer.
  • projections 9 on the housing 3 and depressions 10 on the inner surface of the holder 8, into which the elastomer 6 engages can be clearly seen.
  • the projection 9 on the housing 3 is formed by a circumferential collar which is formed over a phase so that it does not have a rectangular cross-sectional shape.
  • the recess 10 in the holder or in the outer housing is designed in the form of a circumferential groove, which is also not rectangular, but with bevelled edges. This can be seen from Figure 1.
  • These respective bevels on the collar or on the groove serve to prevent the inclusion of air bubbles when casting the elastomer.
  • the groove of the holder or the collar of the converter housing serve to hold the elastomer encapsulation mechanically securely.
  • the holder itself is tubular and can also be closed on the back.
  • the bottom surface of the converter housing which corresponds to the surface that emits the sound, must of course not be cast in.
  • Figure 2 shows a possibility for a casting mold 11 for mutual connection between the converter housing 3 and the holder 8.
  • the casting mold 11 is designed so that it fixes the converter housing 3 and the holder 8 in the required relative position to each other.
  • the elastomer 6 is then poured into the flowable state between the holder 8 and the housing 3.
  • the fill level is chosen so that the back of the housing 3, from which the contact wires 4 are led out, is completely covered by the elastomer 6. It goes without saying that for this purpose the holder must protrude beyond the rear of the housing, as shown in FIG. 2. After removing the form 11 stands thus an ultrasonic transducer as shown in FIG. 1 is ready.
  • FIG. 3 shows a further example of an ultrasound transducer which has a structure-borne noise decoupling which is improved compared to the embodiment in FIG. 1 and at the same time has a minimal influence on the acoustics of the transducer.
  • the converter housing 3 is only potted with an elastomer 6 up to the lower edge of the collar 9.
  • the remaining space between the holder 8 and the housing 3 is foamed with a PU or silicone foam 7 of low to medium density after the elastomer 6 has hardened.
  • FIG. 3 further shows, as in FIG. 1, the piezo-ceramic transducer body 1, an adhesive layer 2, a damping material 5 and the electrical contacts 4.
  • the PU or silicone foam can be glued into the space between the holder 8 and converter housing 3 in the form of prefabricated molded parts, for example from injection molding or by punching out of appropriate mats.
  • FIG. 4 shows a possibility for a casting mold 11 with which a transducer according to FIG. 3 can be manufactured.
  • the casting mold 11 holds the converter housing 3 and the holder 8 centered on one another during the casting of the elastomer 6.
  • the part of the intermediate space between the converter housing 3 and the holder 8, which is later to be filled by the PU or silicone foam, is here initially encased by the corresponding casting mold 11. taken.
  • the casting mold is removed and the PU or silicone foam can be poured into the resulting space.
  • the back of the converter housing 3 is completely covered by the elastomer 6, as in FIG. 2.
  • the casting molds 11 for the elastomer 6 are preferably made of Teflon. If potting molds made of other materials are used, they should preferably be coated with Teflon or another release agent to allow easy removal of the mold after the elastomer has hardened.
  • Preferred elastomers for use as a connecting member in the present invention are polyurethane elastomers (such as Sikaflex ® 228) or elastomers based on silicone (for example, Elastosil ® A234).

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

Abstract

L'invention concerne un transducteur d'ultrasons, particulièrement adapté à la mesure dans les gaz, et le procédé de fabrication dudit transducteur. Ce transducteur d'ultrasons comporte un boîtier (3) avec une paroi de fond et des parois latérales, un corps de transducteur (1) disposé sur une surface intérieure de la paroi de fond, et un dispositif de fixation (8) destiné au boîtier (3), relié aux surfaces extérieures des parois latérales par l'intermédiaire d'au moins un élément de raccordement (6) dans une zone arrière du boîtier (3), à distance de la paroi de fond. L'élément de raccordement (6) est formé par un élastomère coulé entre les parois latérales et le dispositif de fixation (8), cet élastomère étant en prise avec une ou plusieurs pattes ou évidements (9, 10) prévus sur les surfaces extérieures des parois latérales et sur le dispositif de fixation (8). L'élastomère recouvre entièrement la zone arrière du boîtier (3). Le coulage de l'élastomère entre le boîtier (3) du transducteur d'ultrasons et la fixation est possible au moyen d'un moule fixant les deux parties. Selon l'invention, ce transducteur d'ultrasons présente un très bon découplage du bruit de structure entre le boîtier de transducteur et le dispositif de fixation et est insensible à l'influence de l'humidité.
PCT/DE2000/001184 1999-06-18 2000-04-11 Dispositif de fixation amortisseur destine au boitier d'un transducteur d'ultrasons et procede de fabrication dudit dispositif WO2000079513A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19927797A DE19927797C1 (de) 1999-06-18 1999-06-18 Ultraschallwandler und Verfahren zu seiner Herstellung
DE19927797.4 1999-06-18

Publications (1)

Publication Number Publication Date
WO2000079513A1 true WO2000079513A1 (fr) 2000-12-28

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DE (1) DE19927797C1 (fr)
WO (1) WO2000079513A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110125024A1 (en) * 2009-10-29 2011-05-26 Roland Mueller Ultrasonic transducer for use in a fluid medium
US8276445B2 (en) * 2006-08-29 2012-10-02 Robert Bosch Gmbh Holding device for an ultrasonic transducer
CN103868626A (zh) * 2012-12-18 2014-06-18 杭州三花研究院有限公司 一种换能器及热量表
CN103868629A (zh) * 2012-12-18 2014-06-18 杭州三花研究院有限公司 一种超声波热量表
CN104040619A (zh) * 2012-01-17 2014-09-10 罗伯特·博世有限公司 超声传感器
CN106015422A (zh) * 2016-05-17 2016-10-12 沈阳远大科技园有限公司 一种超声元件用隔振装置
WO2018236274A1 (fr) * 2017-06-20 2018-12-27 Acosense Ab Agencement de maintien pour un émetteur acoustique dans un système de spectroscopie acoustique

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10125272A1 (de) * 2001-05-23 2002-11-28 Valeo Schalter & Sensoren Gmbh Verfahren zur Herstellung eines Ultraschallsensors sowie Ultraschallsensor
DE102005017008A1 (de) * 2005-04-07 2006-10-12 Valeo Schalter Und Sensoren Gmbh Vorrichtung mit einem Sender, einem Empfänger und einem den Sender und den Empfänger aufnehmenden Gehäuse
DE102005039093A1 (de) * 2005-08-08 2007-02-15 Valeo Schalter Und Sensoren Gmbh Ultraschallsensor, Entkopplungsmaterial für einen Ultraschallsensor und Verfahren zur Lackierung eines Ultraschallsensors
DE102006028211A1 (de) * 2006-06-14 2007-12-20 Valeo Schalter Und Sensoren Gmbh Ultraschallsensor mit Membran
DE102006028213A1 (de) * 2006-06-14 2007-12-20 Valeo Schalter Und Sensoren Gmbh Ultraschallsensor mit Entkopplungselement
DE102007043500A1 (de) * 2007-09-12 2009-03-19 Valeo Schalter Und Sensoren Gmbh Einbauanordnung für ein schwingungsempfindliches Bauteil, insbesondere eines Ultraschallwandlers, und Verfahren zum Einbau des Bauteils
JP5099175B2 (ja) 2010-05-28 2012-12-12 株式会社村田製作所 超音波センサ
DE202013104569U1 (de) * 2013-10-09 2013-11-25 Pepperl + Fuchs Gmbh Ultraschallsensor
DE102017107331A1 (de) 2017-04-05 2018-10-11 Turck Holding Gmbh Ultraschallsensor
DE102019124614A1 (de) * 2019-09-12 2021-03-18 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Messkopf zur zerstörungsfreien Prüfung eines Gegenstandes, Messsystem und Verfahrens zur Prüfung von Schweißnähten an Faserverbundwerkstoffen
DE202020100871U1 (de) * 2020-02-18 2020-11-11 Leuze Electronic Gmbh + Co. Kg Ultraschallsensor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59188298A (ja) * 1984-03-14 1984-10-25 Matsushita Electric Ind Co Ltd 超音波セラミツクマイクロホン
JPS63255681A (ja) * 1987-04-13 1988-10-21 Matsushita Electric Works Ltd 超音波振動子
DE19601656A1 (de) * 1996-01-18 1997-07-24 Teves Gmbh Alfred Bedämpfter Ultraschallwandler
DE19744229A1 (de) * 1997-10-07 1999-04-29 Bosch Gmbh Robert Ultraschallwandler

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3301848C2 (de) * 1983-01-20 1984-11-08 Siemens AG, 1000 Berlin und 8000 München Ultraschallwandler
DE3832947C2 (de) * 1988-09-28 1996-04-11 Siemens Ag Ultraschall-Wandler
DE4230773C2 (de) * 1992-09-15 2000-05-04 Endress Hauser Gmbh Co Ultraschallwandler

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59188298A (ja) * 1984-03-14 1984-10-25 Matsushita Electric Ind Co Ltd 超音波セラミツクマイクロホン
JPS63255681A (ja) * 1987-04-13 1988-10-21 Matsushita Electric Works Ltd 超音波振動子
DE19601656A1 (de) * 1996-01-18 1997-07-24 Teves Gmbh Alfred Bedämpfter Ultraschallwandler
DE19744229A1 (de) * 1997-10-07 1999-04-29 Bosch Gmbh Robert Ultraschallwandler

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 009, no. 047 (E - 299) 27 February 1985 (1985-02-27) *
PATENT ABSTRACTS OF JAPAN vol. 013, no. 070 (P - 829) 17 February 1989 (1989-02-17) *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8276445B2 (en) * 2006-08-29 2012-10-02 Robert Bosch Gmbh Holding device for an ultrasonic transducer
US20110125024A1 (en) * 2009-10-29 2011-05-26 Roland Mueller Ultrasonic transducer for use in a fluid medium
US8288920B2 (en) * 2009-10-29 2012-10-16 Robert Bosch Gmbh Ultrasonic transducer for use in a fluid medium
CN104040619A (zh) * 2012-01-17 2014-09-10 罗伯特·博世有限公司 超声传感器
CN103868626A (zh) * 2012-12-18 2014-06-18 杭州三花研究院有限公司 一种换能器及热量表
CN103868629A (zh) * 2012-12-18 2014-06-18 杭州三花研究院有限公司 一种超声波热量表
CN103868626B (zh) * 2012-12-18 2017-07-11 杭州三花研究院有限公司 一种换能器及热量表
CN106015422A (zh) * 2016-05-17 2016-10-12 沈阳远大科技园有限公司 一种超声元件用隔振装置
WO2018236274A1 (fr) * 2017-06-20 2018-12-27 Acosense Ab Agencement de maintien pour un émetteur acoustique dans un système de spectroscopie acoustique

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