EP0684085A1 - Offene Sonar-Anordnung mit elektroakustische Wandler - Google Patents

Offene Sonar-Anordnung mit elektroakustische Wandler Download PDF

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Publication number
EP0684085A1
EP0684085A1 EP95401230A EP95401230A EP0684085A1 EP 0684085 A1 EP0684085 A1 EP 0684085A1 EP 95401230 A EP95401230 A EP 95401230A EP 95401230 A EP95401230 A EP 95401230A EP 0684085 A1 EP0684085 A1 EP 0684085A1
Authority
EP
European Patent Office
Prior art keywords
antenna according
assemblies
antenna
baffle
axis
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.)
Withdrawn
Application number
EP95401230A
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English (en)
French (fr)
Inventor
Jacky Garcin
Yves Ripoll
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.)
Direction General pour lArmement DGA
Etat Francais
Original Assignee
Direction General pour lArmement DGA
Etat Francais
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
Priority claimed from FR9406406A external-priority patent/FR2720585B1/fr
Priority claimed from FR9406407A external-priority patent/FR2720586B1/fr
Priority claimed from FR9406409A external-priority patent/FR2720588B1/fr
Priority claimed from FR9406408A external-priority patent/FR2720587B1/fr
Application filed by Direction General pour lArmement DGA, Etat Francais filed Critical Direction General pour lArmement DGA
Publication of EP0684085A1 publication Critical patent/EP0684085A1/de
Withdrawn legal-status Critical Current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
    • B06B1/0607—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
    • B06B1/0611—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 in a pile
    • B06B1/0618—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 in a pile of piezo- and non-piezoelectric elements, e.g. 'Tonpilz'

Definitions

  • the present invention relates to an improvement made to sonar antennas.
  • the technical field of the invention is that of the manufacture of underwater acoustic transducers.
  • Sonar antennas are used in particular to emit sound waves in the marine or underwater environment, for example isotropically in a plane.
  • sonar antennas are usually used comprising one or more piezoelectric assemblies (or heads), for example of the "Tonpilz” type, essentially composed of a stack of piezoelectric ceramic discs and electrodes which is kept in compression by a prestressing rod, between a mobile horn intended to transmit acoustic waves to the underwater environment and a counter-mass, generally decoupled from this environment.
  • piezoelectric assemblies or heads
  • Nonpilz essentially composed of a stack of piezoelectric ceramic discs and electrodes which is kept in compression by a prestressing rod, between a mobile horn intended to transmit acoustic waves to the underwater environment and a counter-mass, generally decoupled from this environment.
  • a sonar antenna comprising a rigid cylindrical envelope against the inner wall of which are arranged radially piezoelectric motors fixed on a central part serving as common counter mass;
  • the sonar antenna which comprises the cylindrical envelope which can constitute a hoop, comprises two lateral covers assembled in a sealed manner with the rigid cylindrical envelope, so as to constitute a closed enclosure which can be filled with a dielectric liquid and can communicate with a deformable container immersed in water, so as to put the liquid in equilibrium with water.
  • This type of antenna has several disadvantages, in fact the rigid cylindrical envelope which can be produced for example in a material such as carbon is very expensive; moreover, the precautions to be taken to guarantee sealing require great precision in machining and assembly and, consequently, high costs.
  • this type of sonar antenna is difficult to implement using such large diameter cylindrical envelopes, which is made necessary in order to achieve high powers and a high bandwidth, especially at low frequency.
  • this type of antenna can hardly be dismantled, and does not allow control of the electrical connection of the transducers, nor easy replacement of one of them.
  • a sonar antenna comprising a gas-tight envelope, at least one piezoelectric transducer situated inside the envelope which comprises in the space between the transducer and the inner wall of the envelope a solid material separated from the vibrating wall of the envelope by a small clearance filled with gas in equilibrium with the outside; according to this document, the antenna comprises a cylindrical channel in which a piston slides and which communicates by one end with the exterior of the envelope and by the other end with the interior of the envelope.
  • the sonar antenna described in this document also has the drawbacks cited for that of the previous document; moreover, this type of sonar antenna comprising a movable piston and corresponding sealing means is more complex and therefore more expensive and less reliable.
  • sonar antennas of known type have two major additional drawbacks: when the antenna is sealed at the level of the pavilions where the displacement is maximum, this causes rapid wear of the seals; moreover, the mounting of the transducers inside a casing makes it very difficult, if not impossible, to standardize the mechanical stresses in the ceramic pillars which would be necessary to effectively use in power applications, the performances of these stacks of ceramic.
  • the problem is to overcome the drawbacks of known antennas, by providing large diameter sonar antennas that can be obtained at low cost, capable of being immersed at great depth to emit sound waves, equipped with high power piezoelectric transducers.
  • a sonar antenna comprising one or more so-called "multi-head" cylindrical transducers, each of the transducers comprising a plurality (at least 4) of substantially identical sets each comprising a horn and a piezoelectric motor, (each of the motors comprising at least one stack of piezoelectric elements alternating with electrodes, which stack is compressed and / or prestressed by at least one prestressing rod), which assemblies are fixed by the prestressing rod to a counter-mass common to all motors of the transducer, of generally cylindrical shape with an axis ZZ1, which sets extend along axes YY1, YY2, YY3 ...
  • each of the pavilions and / or each of the stacks is coated on its external face with an electrically insulating and waterproof coating, so that the antenna can be "open", that is to say that it is not contained in a sealed box and / or inside a sealed cylindrical envelope.
  • the waterproof insulating coating comprises rubber overmolded on the roof and the engine stack.
  • the antenna comprises means for acoustic treatment and / or for adapting the acoustic impedance of the cavities, and / or the interstices situated between the motor / horn assemblies and between the superimposed transducers.
  • the acoustic treatment means comprise, either for each of the engine / horn assemblies, a baffle partially surrounding at least the stack and comprising a part situated in the immediate vicinity of the rear face of the horn of the engine / horn assembly, or compliant tubes substantially parallel to the axis ZZ1; which compliant tubes are preferably of similar length (or height), for example at least equal to the length (or height) of the counter mass.
  • the baffle is made of a light cellular material, for example with a closed structure, and it has a generally frustoconical shape having as axis the longitudinal axis of the transducer.
  • the baffle comprises two substantially identical half shells which can be fixed to the engine / roof assembly by strapping means such as collars.
  • water passage means such as tubular and conical channels, are provided between the baffle and the stack of piezoelectric elements on the one hand, and between the baffle and the rear face of the roof of on the other hand, thereby allowing convection cooling of the submerged motor / horn assembly.
  • the baffles are pierced with several radial channels allowing the passage of water between their substantially cylindrical internal face of the baffle and their substantially frustoconical external face thus making it possible to facilitate the passage of water and the cooling of the engine / horn assembly.
  • the waterproof insulating coating has protuberances which can cooperate with complementary means, such as grooves, provided on the substantially cylindrical internal face of the baffles in order to allow the longitudinal positioning, along the longitudinal axis of the assembly, of the baffles. with respect to the engine / roof assembly.
  • the second type of acoustic treatment means namely the system of compliant tubes
  • the spaces left free inside the antenna that is to say located between the engine / horn assemblies, in a cylindrical tubular zone comprised between the external wall of the counter mass and a fictitious cylinder surrounding the antenna (having for axis the axis ZZ1 and for diameter that of a circle centered on the axis ZZ1 and surrounding the pavilions of the transducers) , as resonant cavities (or Helmoltz cavities), and the passages left free between the pavilions are used as "vents", so as to constitute a phase-shifting system; preferably, the acoustic elasticity of the free spaces is increased (adjusted) by placing compiling tubes, depending on the performance required and the acoustic "resistance" of the "vents” which is a function of the spacing between the assemblies (particularly between their pavilions).
  • the antenna comprises several superimposed transducer modules each comprising an identical number of assemblies, these assemblies being superimposed so that their longitudinal axes are all included in radial planes having for common intersection the longitudinal axis ZZ1, and it comprises, at least one (for example three) compliant tube. extending in the spaces left free between the assemblies whose axes are in two neighboring planes (or consecutive).
  • the compliant tubes have a substantially rectangular ovalized section, that is to say with rounded angles, which section comprises, for example, two substantially rectilinear parts, substantially parallel to each other and connected at their ends by two semi- circular.
  • each of the piezoelectric horn-motor assemblies is provided (preferably at its base, that is to say at the longitudinal end opposite the flag) of reversible bipolar electrical connection means (a first pole corresponding to the ground, a second pole corresponding to the "hot spot"), which can cooperate with complementary connection (or plug-in) means provided in the counter-mass.
  • each of the assemblies can be electrically connected and disconnected by a translational movement of the assembly relative to the counterweight, along the longitudinal axis of the engine and / or of the assembly, preferably thanks to at least one female plug capable of cooperating with at least one male plug.
  • each of the assemblies has at its base a piece, or support flange, electrically conductive, connected to electrodes mass of the stack by a conductive wire, and electrical contact with the common counter mass.
  • a seal is provided between the support part or flange and the corresponding support phase of the counterweight.
  • each of the assemblies is fixed in a reversible or removable manner on the counterweight by a second threaded end of the prestressed rod, which rod is threaded at its first end so as to receive a nut bearing on the flag.
  • the antenna comprises for each of the assemblies an angular locating (or wedging) pin of the assembly with respect to the counter-mass.
  • the counterweight is provided with a recess, or well or bore, substantially central, extending along the axis ZZ1, which can be filled with a gas under pressure and, the counterweight is electrically connected to the electrodes of mass of the stack of piezoelectric elements of the motors, so as to constitute a common ground electrode for all the motors and / or transducers.
  • the transducers are assembled by their respective counter-masses using flanges or spacers of generally cylindrical shape, of axis ZZ1, which are superimposed; the various parts forming the counter-mass and the connecting flanges or spacers each comprise a central recess, sealing means and angular setting means between each pair of successive sections (countermasses or flanges or spacers).
  • the sections are assembled by tie rods extending along the axis ZZ1, outside the sections, bearing on the end plates of the counter-mass.
  • each of the sections or flanges receiving on its external face several motor / horn assemblies comprises, in the recess or cavity, means of connection or electrical connection such as a terminal block allowing the grouping of the conductive wires supplying the motors , and allowing the connection of modules to external antenna power cables.
  • the transducers and sonar antennas according to the invention it is possible to obtain a bandwidth very much greater than that of known antennas, of the order of twice as wide, and the invention makes it possible to provide sonar antennas of high power, mass and reduced cost.
  • the sealed central recess which can be filled with a gas, it is also possible to use internal means of electrical connection (wires, terminal blocks, etc.) that are not waterproof.
  • a sonar antenna 1 comprises several modules or transducers superimposed along an axis ZZ1, each module or transducer comprising a plurality (10 in FIGS. 1 and 4) of piezoelectric horn / motor assemblies marked 2 1 , 2 2 , .. 2, o, which are identical; the assemblies extend along respective longitudinal axes YY1, YY2, ... YY10 which are uniformly distributed in the plane of FIGS. 1 and 4, according to an advantageously constant angular distance 12.
  • Each of the assemblies comprises a prestressing rod 4 1 , a stack 7, of pie elements zoelectric in the form of a crown, constituting a piezoelectric motor, extending along the longitudinal axis YY1 of said motor as well as the prestressing rod.
  • the prestressing rod mechanically connects the roof 3, of the assembly to the common counter mass 9 of the sonar antenna and / or of the corresponding transducer module.
  • each of the assemblies is provided, in the space situated around the stack of piezoelectric elements and at the rear of the roof, with a cabinet respectively 10 1 , 10 2 , .. 10 10 of general shape of revolution, having a frustoconical external face; it can also be seen in this figure that interstices 13 or cavities remain inside the transducer, which cavities are filled with water when the transducer module and / or the antenna is immersed.
  • the antenna 1 comprises two modules or transducers 57, as shown in FIG. 1, which are superimposed along the axis ZZ1 of general symmetry of the antenna, each of the transducers comprising a plurality of piezoelectric pavilion-motor assemblies 2, the longitudinal axes of which extend in a plane P (with regard to the module 57 located to the right of FIG. 2) and are coplanar and concurrent at a point on the axis ZZ1 of the antenna.
  • This figure also shows the interstices or cavities 13 left free inside the antenna and which are filled with water when the latter is immersed.
  • each of said piezoelectric pavilion-motor assemblies is equipped with a baffle 10 which may essentially consist of two half shells 15 1 , 15 2 a lightweight foam material such as, for example, polyvinyl chloride foam.
  • the assembly essentially comprises a pavilion 3 which will be able to move under the effect of the vibrations generated by the stack 7 of piezoelectric elements 6 superimposed and alternated with electrodes 8 which electrodes are, for some, marked 8a , connected to an electric ground wire 21 which can advantageously be electrically linked to an electrically conductive support flange 25 and to the common counter ground 9, and, for others, marked 8b, and alternated with the first , connected to an electrically conductive wire 22 constituting the "hot spot" by which the piezoelectric elements can be excited.
  • An adjustment shim 27 is also provided between one end of the stack of piezoelectric elements and the pavilion 3; the stack can be prestressed and / or compressed by a prestressing rod 4 bearing via the support face 20a of a nut 20, on the corresponding support face 3a of the pavilion 3, which rod is screwed into the common counter mass 9 at its second end.
  • the assembly constituted by the pavilion 3, the rod 4, the stack of piezoelectric elements alternating with the electrodes 8 can be covered with an electrically insulating and waterproof coating 5 which comprises a part 5a covering the front face of the pavilion, a part 5b covering the rear face of the roof, a part 5c covering the external face of the stack and a part 5d partially covering at least the support flange 25.
  • the part 5a of the covering has a central zone 5e which can be cut (removed) to allow disassembly of the assembly; for this purpose, following the removal of the central zone 5e, it is then possible, by means of a threaded bore 4b provided at the first end of the rod, using a tool (not shown) screwed into the threaded bore and bearing on the front face 3b of the roof, exert a longitudinal traction (directed downwards, with reference to FIG. 3) making it possible to compensate for the prestressing forces, and thus making it possible to unscrew the nut 20, for example thanks to cavities 20b provided in the external face of the nut, in which a tool (not shown) can bear.
  • the covering 5 has in the part 5c protrusions 19 which can cooperate with circular or circumferential grooves 18 provided on the cylindrical internal face of the baffle in order to allow the longitudinal positioning of the baffle relative to the assembly.
  • the baffle which is here in the form of a revolution comprises a frustoconical external surface 23 of axis YY1 which constitutes the general longitudinal axis of the assembly and a cylindrical internal surface 24a extended by a frustoconical internal surface 24b; the internal surfaces 24a and 24b of the baffle which are situated respectively opposite the external face of the covering 5c of the stack and the external face of the covering 5b of the rear face of the roof, delimit a free space comprising substantially a channel 37 substantially tubular, and a channel 56, substantially frustoconical, which channels 37 and 56 will be filled with water when the antenna is submerged, which water can circulate in order to facilitate the cooling of the assembly.
  • the circulation of water along the external walls of the covering of the assembly can be advantageous. sement facilitated by channels 14 provided in the cabinet which communicate the internal face 24 and the external face 23 of the cabinet; advantageously the baffle can be maintained around the assembly by means of collars 17 wedged in grooves 16 provided on the external face 23 of the baffle.
  • the antenna is provided, in each of the spaces located between the counterweight and the rear of the pavilions, with three compliant tubes 38 substantially parallel to the axis ZZ1; it can also be seen in this figure that interstices 13, or cavities, remain inside the module, which cavities are filled with water when the module and / or the antenna is immersed .
  • the antenna which extends along the general axis of symmetry ZZ1 and of which only a quarter has been shown, comprises the common counter mass 9 whose cross section, in a plane perpendicular to l axis ZZ1, is a regular polygon and comprises the bearing or fixing faces of each of the motor / horn assembly of the antenna, which sets extend radially along the longitudinal axes YV 1 , YY 2 , advantageously uniformly angularly distributed according to the angular difference 12.
  • a flat plate or sheet 50 in which cutouts have been arranged in order to allow the plane to pass through. the plate 50 by the compliant tubes 38.
  • the compliant tubes are advantageously of "rounded rectangular” section, extending along axes perpendicular to the plane of FIG. 5 and parallel to the axis ZZ1 of the antenna.
  • the compliant tubes 38 which partially occupy the cavities or free spaces 13 located between the engine / horn assemblies are three in number between each group of vertically superimposed assemblies and are held in position in the upper part of the antenna by lugs 53 of wedging of the compliant tubes, which legs are fixed on the flat plate 50.
  • end 4a of the prestressing rod 4 is advantageously threaded so as to be screwed into a tapped bore 28 provided in the common counter mass 9.
  • the assembly constituted by the flag, the rod, the stack of piezoelectric elements alternating with the electrodes is supported by the flange 25 bearing against the common counter mass 9, and is angularly positioned by means of a wedge pin 26 angular cooperating with a bore 30 2 provided in the common counter mass, the pin partially extending in a corresponding bore 30, provided in the support flange 25.
  • the support flange 25 which is partially externally covered with the part 5d of the electrically insulating waterproof covering, comprises a conduit 58 in which the end of the conductive wire 22 can be accommodated allowing the connection of the hot spot piezoelectric elements to an excitation source (not shown).
  • the electrical connection of the end of the wire or cable 22 can be made by a connector comprising a female plug 31 electrically connected to the end of the conductor 22 which can come to fit around a male plug 32 mechanically linked to the common counter mass but electrically insulated therefrom by insulating means 35,34 and electrically connected to a conductor 36 making it possible to connect the piezoelectric elements of the assembly to the excitation source (not shown).
  • the part of the connector located in said support flange 25 also comprises an insulating element 33 which is substantially cylindrical and which serves as an interface between the socket 31.35 and the support sole 25.
  • the sole 25 comprises a groove in which is housed a seal 29 in order to prevent water from being able to penetrate inside the counter mass 9.
  • each of the transducer modules, 57 superimposed along the axis ZZ1 of general symmetry of the antenna, comprises several sets 2 piezoelectric motor horn coated externally with the electrically insulating and waterproof coating 5.
  • Each of the assemblies 2 is fixed on a flange forming a unitary counterweight 43 forming part of the common counterweight 9.
  • a spacer 44 is interposed between two successive transducer modules 57 and more precisely between the respective countermasses 43 of two successive superimposed modules 57.
  • the assembly 9 forming the common counter mass is hollow and is provided with a central recess 11 comprising a substantially cylindrical recess 11 provided in each of the flanges or against unit mass 43 and a cylindrical recess 11 provided in the spacer 44 and likely to communicate on recesses 11 b.
  • the common counter mass comprises, in addition to the spacer and the unitary countermuffs in the form of flanges 43, an upper plate 39 closing the channel or obviously, provided in the upper part of the counter mass, and a lower plate 40 playing the same role d 'sealing and closing of course; seals 41 and angular setting pins 42 are provided between each of the parts 39, 43, 44, 43, 40 respectively.
  • the assembly of the common counter mass constituted by the end plates 39 and 40, the respective unit counter masses 43 of the transducers and the spacer 44, is held mechanically linked by means of tie rods 45 which bear on the part circumferential of each of the plates 39 and 40 and which are threaded, at least in part, and stopped by known systems (of the nut type for example) so as to tighten the elements forming the common counter-mass against each other;
  • the lower plate 40 may be provided with a plug 59 making it possible to facilitate access to the electrical connections of the transducers on a connector or terminal block or electrical connection means 52 provided in the cavity, 11b arranged inside the flange 43, located in the lower part of the antenna.
  • electrical connectors 46 make it possible to connect, via cables 60, the antenna to a generator (not shown). They are sealed, fixed to the upper plate 39 and thus allow the connection of all the transducers of the antenna by means of the electrical connection means 52 provided in the recesses 11b of each of the flanges 43 forming the transducer support. .
  • the antenna can be fixed to a bracket 51 by means of an upper connecting means 49 in the form of a stirrup and of a plate 50, which stirrup is linked to the upper plate 39 in order to allow the support of the antenna by the gallows 51.
  • a lower connecting means 48 also in the form of a jumper, makes it possible to mechanically and rigidly connect the lower plate 40 forming part of the counterweight 9 of the antenna to a plate 47 of general shape flat and serving as support.
  • the plate 47 of generally planar shape, serving as a support also serves as a means of attachment to compliant hollow tubes 38 extending parallel to the axis ZZ1 of antenna symmetry, which compliant tubes are provided in the cavities left free between the antenna transducer assemblies and thus allow the impedance of the cavities to be adjusted in order to limit the interference between the acoustic radiation from the front face of the pavilion sets and the acoustic radiation from the rear face of the pavilion.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Aerials (AREA)
  • Transducers For Ultrasonic Waves (AREA)
EP95401230A 1994-05-26 1995-05-26 Offene Sonar-Anordnung mit elektroakustische Wandler Withdrawn EP0684085A1 (de)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
FR9406407 1994-05-26
FR9406406 1994-05-26
FR9406406A FR2720585B1 (fr) 1994-05-26 1994-05-26 Transducteur électro acoustique antenne sonar ouverts.
FR9406409 1994-05-26
FR9406408 1994-05-26
FR9406407A FR2720586B1 (fr) 1994-05-26 1994-05-26 Antenne sonar à têtes démontables.
FR9406409A FR2720588B1 (fr) 1994-05-26 1994-05-26 Perfectionnement acoustique aux antennes sonar.
FR9406408A FR2720587B1 (fr) 1994-05-26 1994-05-26 Perfectionnement aux antennes sonar munies d'une contre masse commune.

Publications (1)

Publication Number Publication Date
EP0684085A1 true EP0684085A1 (de) 1995-11-29

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Application Number Title Priority Date Filing Date
EP95401230A Withdrawn EP0684085A1 (de) 1994-05-26 1995-05-26 Offene Sonar-Anordnung mit elektroakustische Wandler

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EP (1) EP0684085A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2730421C1 (ru) * 2019-11-29 2020-08-21 федеральное государственное бюджетное образовательное учреждение высшего образования "Алтайский государственный технический университет им. И.И. Ползунова" (АлтГТУ) Высокочастотный пьезопреобразователь для ультразвуковой коагуляции

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190921394A (en) * 1909-09-18 1910-09-19 Evershed Vignoles Ltd Improvements in and relating to the Production of Sound Waves by Means of Forced Vibrations.
FR2302655A1 (fr) 1975-02-27 1976-09-24 France Etat Transducteur piezoelectrique multimoteurs a contremasse unique
FR2302656A1 (fr) * 1975-02-27 1976-09-24 France Etat Transducteur piezoelectrique pour basses frequences
FR2361033A1 (fr) 1976-08-03 1978-03-03 France Etat Transducteurs piezoelectriques et antennes acoustiques immergeables a grande profondeur
FR2498866A1 (fr) * 1981-01-27 1982-07-30 Tech Radioelect Electro Fs Carter de maintien pour transducteur electroacoustique de puissance soumis a de fortes pressions hydrostatiques
FR2569326A1 (fr) * 1984-08-16 1986-02-21 France Etat Armement Transducteurs piezo-electriques et antennes de sonar pouvant etre immerges a grande profondeur
GB2164226A (en) * 1983-06-23 1986-03-12 France Etat Electroacoustic transducer
EP0462037A1 (de) * 1990-06-12 1991-12-18 Gilles A . Grosso Elektroakustischer Unterwasserwandler
FR2665998A1 (fr) * 1988-05-05 1992-02-21 France Etat Armement Procedes et transducteurs electro-acoustiques pour emettre des ondes acoustiques a basse frequence dans un liquide.
GB2270231A (en) * 1992-08-28 1994-03-02 Thomson Csf Tonpilz transducer protected against shocks
FR2697709A1 (fr) * 1992-11-05 1994-05-06 France Etat Armement Dispositif d'étanchéité de moteurs électro-acoustiques.

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190921394A (en) * 1909-09-18 1910-09-19 Evershed Vignoles Ltd Improvements in and relating to the Production of Sound Waves by Means of Forced Vibrations.
FR2302655A1 (fr) 1975-02-27 1976-09-24 France Etat Transducteur piezoelectrique multimoteurs a contremasse unique
FR2302656A1 (fr) * 1975-02-27 1976-09-24 France Etat Transducteur piezoelectrique pour basses frequences
FR2361033A1 (fr) 1976-08-03 1978-03-03 France Etat Transducteurs piezoelectriques et antennes acoustiques immergeables a grande profondeur
FR2498866A1 (fr) * 1981-01-27 1982-07-30 Tech Radioelect Electro Fs Carter de maintien pour transducteur electroacoustique de puissance soumis a de fortes pressions hydrostatiques
GB2164226A (en) * 1983-06-23 1986-03-12 France Etat Electroacoustic transducer
FR2569326A1 (fr) * 1984-08-16 1986-02-21 France Etat Armement Transducteurs piezo-electriques et antennes de sonar pouvant etre immerges a grande profondeur
FR2665998A1 (fr) * 1988-05-05 1992-02-21 France Etat Armement Procedes et transducteurs electro-acoustiques pour emettre des ondes acoustiques a basse frequence dans un liquide.
EP0462037A1 (de) * 1990-06-12 1991-12-18 Gilles A . Grosso Elektroakustischer Unterwasserwandler
GB2270231A (en) * 1992-08-28 1994-03-02 Thomson Csf Tonpilz transducer protected against shocks
FR2697709A1 (fr) * 1992-11-05 1994-05-06 France Etat Armement Dispositif d'étanchéité de moteurs électro-acoustiques.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Y. LE GALL: "Transducteur basse fréquence, grande immersion, large bande et à rendement élevé, pour l'ocanographie acoustique", ONDE ELECTRIQUE, vol. 74, no. 5, PARIS FR, pages 22 - 28 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2730421C1 (ru) * 2019-11-29 2020-08-21 федеральное государственное бюджетное образовательное учреждение высшего образования "Алтайский государственный технический университет им. И.И. Ползунова" (АлтГТУ) Высокочастотный пьезопреобразователь для ультразвуковой коагуляции

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