EP1684917B1 - 1-3-verbundstruktur mit hochfrequenz-sonarantenne - Google Patents

1-3-verbundstruktur mit hochfrequenz-sonarantenne Download PDF

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Publication number
EP1684917B1
EP1684917B1 EP04766227.5A EP04766227A EP1684917B1 EP 1684917 B1 EP1684917 B1 EP 1684917B1 EP 04766227 A EP04766227 A EP 04766227A EP 1684917 B1 EP1684917 B1 EP 1684917B1
Authority
EP
European Patent Office
Prior art keywords
pads
antenna
sensors
antenna according
strips
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
EP04766227.5A
Other languages
English (en)
French (fr)
Other versions
EP1684917A1 (de
Inventor
Sylvie Thales Intellectual Property PONTHUS
Gérard Thales Intellectual Property Roux
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.)
Thales SA
Original Assignee
Thales SA
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Filing date
Publication date
Application filed by Thales SA filed Critical Thales SA
Publication of EP1684917A1 publication Critical patent/EP1684917A1/de
Application granted granted Critical
Publication of EP1684917B1 publication Critical patent/EP1684917B1/de
Anticipated expiration legal-status Critical
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    • 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
    • B06B1/0607—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 multiple elements
    • B06B1/0622—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 multiple elements on one surface
    • B06B1/0629—Square array

Definitions

  • the present invention relates to an antenna structure that can operate at high frequency, consisting of piezoelectric ceramic pads grouped into subsets forming independent sensors.
  • the pads are embedded in a dielectric filling matrix which gives the antenna good mechanical strength and acoustic properties that are advantageous in terms of decoupling.
  • This antenna can in particular be used in high frequency sonar sonar type sonar.
  • FIG. figure 1 presents such an arrangement.
  • a set of pads 10 of piezoelectric ceramic mounted on a rear plate 11.
  • These pads can be grouped into subsets also called sensors.
  • all the pads of the sensor are connected to each other by their upper face 12 and brought into contact by their rear face with the plate 11.
  • the front and rear faces of the pads are metallized.
  • the contact can for example be made by depositing a metallization layer on the face 13 of the rear plate 11 in contact with the studs 10.
  • FIG. figure 2 An arrangement as illustrated by FIG. figure 2 .
  • the antenna thus produced is presented as a set of studs 10 regularly distributed on the rear plate 11 and grouped into sensors 20.
  • the face of the rear plate 11 in contact with the pads has an alternation of metallized surface elements 21 separated by Each metallized surface is positioned under a group of pads forming a same sensor, the non-metallized strips for electrically isolating the sensors from each other.
  • the combination of the different pads into sensors makes it possible to produce an antenna capable of forming several transmission / reception channels. In the case of a high frequency acoustic emission, typically between 100 kHz and a few MHz, the pads forming the antenna are of reduced size.
  • the mechanical strength of the antenna formed by the studs and the back plate is made, in a known manner, by filling the spaces between pads with a rigid dielectric material also called matrix.
  • a structure commonly known as composite 1-3 is obtained.
  • the structure thus produced is completed by the placement on the upper faces 12 of adaptation layers and a sealing membrane.
  • the front face thus formed constitutes the face of the antenna in contact with the propagation medium, for example the marine environment.
  • the use of adaptation layers is described in particular in the French patent application 94 08474 filed by the applicant and published on 12.01.96 under number 2 722 358.
  • the filling matrix used is commonly made based on polyurethane or epoxy resin, both of these materials having advantages and disadvantages.
  • the epoxy-based composites 1-3 have the advantage of having a high hydrostatic coefficient d h , which can reach for example a few hundred picocoulombs per newton. Such a hydrostatic coefficient makes it possible in particular to obtain a high electrical mechanical transformation coefficient ⁇ .
  • the epoxy-based composites 1-3 also have the advantage of only slightly expanding as a function of temperature variations and of having good adhesion to the ceramic, which avoids the use of specific preparations intended to ensure adhesion of the matrix to the pads.
  • the epoxy-based composites 1-3 have poor acoustic decoupling properties and the use of epoxy matrix induces acoustic crosstalk phenomena between the sensors which significantly reduce the quality of the formed channels.
  • the polyurethane-based composites 1-3 have a good quality of acoustic decoupling and thus allow satisfactory decoupling of the formed channels.
  • the polyurethane has a hydrostatic coefficient lower than that of the epoxide, of the order of a few tens of picocoulombs per newton, and therefore a lower coefficient ⁇ .
  • the low rigidity of the polyurethane and its temperature behavior make it unsuitable material for the realization of an antenna having a satisfactory rigidity and having good insensitivity to temperature variations.
  • the antenna according to the invention comprises intermediate elements. These elements are presented as shown in figure 3 in the form of parallelepipedic blades 30 of polyurethane material.
  • the thickness of the blades is determined so as to obtain the optimal decoupling at the frequency used, without altering the characteristics related to the epoxy matrix.
  • the blades may for example be made by molding a thin plate in which the intermediate blades are then cut.
  • the intermediate blades are integrated in the structure of the antenna according to the invention, during its production.
  • the figure 4 illustrates the three stages of realization of the antenna.
  • the figure 4-a illustrates the first step of spreading epoxy resin in the spaces between the pads to a thickness substantially equal to 20% of the height of the pads.
  • the resin layer 40 thus poured spreads on the surface of the rear plate 11.
  • the figure 4-b illustrates the second step of isolating the sensors from each other by inserting the polyurethane blades 30 into the uncrosslinked epoxy resin.
  • the blades can be inserted, for example, manually.
  • the blades are positioned substantially opposite the non-metallized strips 22, represented on the figure 2 .
  • the figure 4-c illustrates the last stage of realization. This step consists in spreading the epoxy resin again in the spaces situated between the studs so as to form a layer of resin 41 whose thickness is substantially equal to the height of the studs 10.
  • the resin is then cured by known methods comprising, for example, cross-linking operations at ambient temperature and after hot cross-linking, followed by polishing and metallization operations.
  • FIG. 5 An antenna according to the invention is thus obtained, a schematic representation of which is seen from above is given by the figure 5 .
  • a structure comprising a rear plate 11 and a set of piezoelectric ceramic studs 10, electrically grouped into subsets defining sensors 21.
  • the surface of the plate 11 in contact with the studs has an alternation of metallized surface elements 21 separated from each other by non-metallized strips 22.
  • the antenna structure also includes spacer blades 30 which form separations between the different groups of pads.
  • the structure of the antenna according to the invention offers the advantage of not presenting any difficulty in its implementation while providing significantly better performance than that of a conventional structure such as that illustrated by FIG. figure 2 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transducers For Ultrasonic Waves (AREA)

Claims (4)

  1. Hochfrequente Sonarantenne, die wenigstens einen Satz von keramischen piezoelektrischen Kontaktstellen (10) umfasst, die auf einer hinteren Platte (11) angeordnet sind, wobei die Kontaktstellen gruppiert sind, um unabhängige Sensoren zu bilden, wobei der Raum zwischen den Kontaktstellen mit einer Epoxidmatrix gefüllt ist, dadurch gekennzeichnet, dass sie in die Matrix integrierte zwischengelegte Streifen (30) umfasst, wobei die zwischengelegten Streifen aus einem Material mit starker akustischer Abkopplung gebildet sind und Partitionen zwischen verschiedenen Sensoren erzeugen.
  2. Antenne nach Anspruch 1, dadurch gekennzeichnet, dass die zwischengelegten Streifen (30) durch Schneiden aus derselben Materialplatte erzeugt werden.
  3. Sonarantenne nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die zwischengelegten Streifen (30) aus Polyurethan gefertigt sind.
  4. Verfahren zum Erzeugen einer Antenne nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass es wenigstens Folgendes beinhaltet:
    - einen Schritt des Bereitstellens eines Satzes von keramischen piezoelektrischen Kontaktstellen (10), die auf einer hinteren Platte (30) angeordnet sind, wobei diese Kontaktstellen gruppiert sind, um unabhängige Sensoren zu bilden;
    - einen ersten Schritt des Ausfüllens des Raums zwischen den Kontaktstellen mit einem Epoxidharz auf eine Dicke, die im Wesentlichen gleich 20 % der Höhe der Kontaktstellen ist;
    - einen Schritt des Einführens der zwischengelegten Streifen (30) in das Epoxidharz, wobei die Streifen so positioniert sind, dass sie die Sensoren voneinander trennen;
    - einen zweiten Schritt des Ausfüllens des Raums zwischen den Kontaktstellen mit dem Epoxidharz, um diesen Raum bis auf eine Dicke zu füllen, die im Wesentlichen gleich der Höhe der Kontaktstellen ist.
EP04766227.5A 2003-07-29 2004-07-15 1-3-verbundstruktur mit hochfrequenz-sonarantenne Expired - Lifetime EP1684917B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0309332A FR2858467B1 (fr) 2003-07-29 2003-07-29 Antenne sonar hf a structure composite 1-3
PCT/EP2004/051497 WO2005014185A1 (fr) 2003-07-29 2004-07-15 Antenne sonar hf a structure composite 1-3

Publications (2)

Publication Number Publication Date
EP1684917A1 EP1684917A1 (de) 2006-08-02
EP1684917B1 true EP1684917B1 (de) 2017-05-03

Family

ID=34043645

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04766227.5A Expired - Lifetime EP1684917B1 (de) 2003-07-29 2004-07-15 1-3-verbundstruktur mit hochfrequenz-sonarantenne

Country Status (5)

Country Link
EP (1) EP1684917B1 (de)
AU (1) AU2004262588A1 (de)
FR (1) FR2858467B1 (de)
NO (1) NO337904B1 (de)
WO (1) WO2005014185A1 (de)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4514247A (en) * 1983-08-15 1985-04-30 North American Philips Corporation Method for fabricating composite transducers
US4801835A (en) * 1986-10-06 1989-01-31 Hitachi Medical Corp. Ultrasonic probe using piezoelectric composite material
US4963782A (en) * 1988-10-03 1990-10-16 Ausonics Pty. Ltd. Multifrequency composite ultrasonic transducer system
US4890268A (en) * 1988-12-27 1989-12-26 General Electric Company Two-dimensional phased array of ultrasonic transducers
FR2722358B1 (fr) * 1994-07-08 1996-08-14 Thomson Csf Transducteur acoustique multifrequences a larges bandes
US6441538B1 (en) * 2000-05-19 2002-08-27 Acuson Corporation Ultrasound stacked transducer and method for stacking
JP3849976B2 (ja) * 2001-01-25 2006-11-22 松下電器産業株式会社 複合圧電体と超音波診断装置用超音波探触子と超音波診断装置および複合圧電体の製造方法

Also Published As

Publication number Publication date
NO337904B1 (no) 2016-07-04
FR2858467B1 (fr) 2008-08-01
FR2858467A1 (fr) 2005-02-04
EP1684917A1 (de) 2006-08-02
WO2005014185A1 (fr) 2005-02-17
NO20060952L (no) 2006-02-27
AU2004262588A1 (en) 2005-02-17

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