EP2480346B1 - Transducteur électro-acoustique - Google Patents

Transducteur électro-acoustique Download PDF

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Publication number
EP2480346B1
EP2480346B1 EP09744932.6A EP09744932A EP2480346B1 EP 2480346 B1 EP2480346 B1 EP 2480346B1 EP 09744932 A EP09744932 A EP 09744932A EP 2480346 B1 EP2480346 B1 EP 2480346B1
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EP
European Patent Office
Prior art keywords
tube
electroacoustic transducer
tube wall
wall
transducer according
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.)
Not-in-force
Application number
EP09744932.6A
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German (de)
English (en)
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EP2480346A1 (fr
Inventor
Rainer Busch
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Atlas Elektronik GmbH
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Atlas Elektronik GmbH
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Publication of EP2480346A1 publication Critical patent/EP2480346A1/fr
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Anticipated expiration legal-status Critical

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    • 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
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
    • G10K9/121—Flextensional transducers

Definitions

  • the invention relates to an electroacoustic transducer according to the preamble of claim 1.
  • the actuator consists of a stack of juxtaposed, piezoelectric elements, between which electrodes are arranged.
  • the longitudinally mechanically biased stack has arcuate end caps around which a wide band surrounding the stack is guided.
  • a curved, elliptical cross-section elliptical cross-section closed at the front includes tape and stack and is oriented so that its larger ellipse axis coincides with the longitudinal axis of the stack.
  • the curved end caps of the stack are firmly connected to the shell.
  • the actuator When an alternating voltage is applied to the actuator, the latter performs an oscillation movement in the direction of its longitudinal axis, which is transmitted to the shell via the end caps of the stack and is converted by the shell into oscillations of significantly greater amplitude taking place transversely to the stack.
  • Tonpilz initial DE 196 230 35 A1
  • Tonpilz initial DE 196 230 35 A1
  • Front and / or back mass consist of foamed metal whose density is set according to the desired converter frequency.
  • the actuator consists of a stack of hollow cylindrical, piezoceramic elements with electrodes arranged therebetween, which is arranged between two plate-like, annular or polygonal end caps and is mechanically biased by means of a guided through the hollow cylindrical elements and the end plates tie rod. Between the radially above the stack projecting two end caps concave curved blades are clamped, which are attached with their ends on the circumference of the end caps, seen in the circumferential direction with gap spacing next to each other.
  • the curved lamellae are surrounded on the outside on their side facing away from the stack by a rubber sleeve, which is attached to the end caps waterproof and the gap between the lamellae waterproof covers.
  • a transmitting transducer used electrical converter sends narrowband and can only up to a certain depth of water, eg about 100 meters, are used, with its transmission behavior, since air-filled, is dependent on the depth of water.
  • the stack of piezoelectric elements, the so-called piezo stack, and the tensioning device for this cause in the known electroacoustic transducers a relatively high weight, which makes them suitable for certain types of applications in the underwater sound technology, e.g. for installation in towed antennas or towed bodies, makes them unattractive.
  • a known electroacoustic transducer ( US 5,229,978 ) has a radially oscillating piezoelectric actuator, which is formed by a longitudinally slotted hollow cylinder made of piezoceramic, whose inner and outer walls are coated with one electrode.
  • the actuator is clamped in a slotted tube and glued to this.
  • the slotted tube is composed of two arcuate wings of relatively strong and lightweight material, such as aluminum, and a wedge member connecting the two wings to each other of a material having a significantly higher tensile strength than the material of the wings.
  • the invention has for its object to provide an electrical converter, in particular for underwater use, which is characterized by a low weight with sufficient high acoustic power, in particular transmission power.
  • the electroacoustic transducer according to the invention has the advantage that the actuator does not consist-as in the prior art-of a relatively heavy, compact stack of ceramic elements which must be mechanically prestressed by a heavy-duty tie rod, but only of a thin and lightweight composite -Module-bearing plastic pipe, which requires no mechanical bias, so that the tie rod comes to an end. Due to the resulting extreme weight reduction of the actuator over the known transducers, the converter is very light and well suited for use in the underwater sound technology. The glass or carbon reinforcement of the plastic pipe provides sufficient strength for underwater use. In addition, a relatively small converter can be realized, which can be designed low-frequency and when used as a transmitting transducer with high transmission power.
  • the DC voltage applied to the composite modules is superimposed on the AC voltage so that it does not distinguish the DC voltage.
  • the piezoceramic fibers in the composite modules in the same direction longitudinal expansions and Longitudinal contractions, whereby the tube alternately lengthened or shortened, so the actuator oscillates in the direction of its longitudinal axis.
  • the fixed connection between the pipe wall and composite modules by sticking the thin elastic composite modules on the pipe wall, wherein the composite modules on the inner or on the outer wall surface and also on the inner and on the outer wall surface of the pipe wall can be attached.
  • the attachment is made by gluing and / or on or lamination in or on the pipe wall.
  • the composite modules are laminated with in the production of the plastic pipe. As a result, the composite modules are already protected in a simple manner against the surrounding water
  • the tube is closed at the end or end waterproof. This has the advantage that inside the tube electronic control circuits for the converter can be accommodated and the converter can be used at great depth, without damaging the electronic components damage.
  • a front mass and a back mass is attached to the two end faces of the tube, which seal the tube watertight.
  • This constructive measure you get a transmitting transducer in Tonpilzied with the typical properties for this construction, but significantly lower weight.
  • Front and back mass is the transmission frequency range of the transmitting transducer and the resonant frequency adjustable.
  • the transmission power is determined by the modulus of elasticity of the pipe, the number of composite modules present on the pipe and the ratio of back mass to front mass.
  • the ends of a tube enclosing the curved, eg convex are at the end edges of the tube or concavely curved, elastic sheath attached and filled the space between the tube wall and the shell with a medium, such as a gel or a liquid, whose characteristic impedance is equal to that of the surrounding medium, for example water.
  • a medium such as a gel or a liquid
  • This constructive complement of the actuator creates an electroacoustic transducer with the characteristics of the known, so-called.
  • Flextensional transducer in which the longitudinal movements of the actuator are transformed into radial movements of the shell, but with the advantage of being significantly lighter and smaller construction.
  • the converter has the advantage of a broadband sound radiation with constant acoustic power and can be advantageous as a transmitting transducer in the tubular casing of a towed antenna, with the possibility of adjusting the diameter of the transducer to the diameter of the tubular casing no additional flow noise in the transmitting part of the towed antenna occur.
  • a plurality of such transducers can be acoustically decoupled from each other in the transmitting part of the towed antenna arranged one behind the other in order to increase the radiated transmission power.
  • the high interior of the transmitter can be centrally accessed and electrical wiring through the tube well laid.
  • the tube wall of the tube is received in a hollow ring with an elliptical cross-section, the outside of the pipe wall covering, with the pipe wall a first cavity enclosing, convex outer shell and the tube wall in the inner tube-covering, with the tube wall a second cavity enclosing, concave inner shell is formed.
  • the ends of the inner and outer shells are fixedly connected to the pipe end of the pipe and the first and second cavities are filled with a medium, preferably a gel or a liquid, whose characteristic impedance is equal to that of the surrounding medium, preferably water.
  • a medium preferably a gel or a liquid
  • a radially above the tube projecting, preferably plate-shaped end cap is attached to each end face and are clamped between the end caps, a plurality of concave, oscillating blades, the end of the end caps in the circumferential direction side by side and with gap spacing are determined from each other.
  • the lamellae are on the outside, so on their outer side facing away from the pipe by a fluid-tight, elastic sheath, for example made of rubber, enclosed, which is fixed fluid-tight end to the end caps.
  • the fins Upon expansion or contraction of the tube, the fins are stretched and compressed, reducing their curvature and increases.
  • the path difference between the two end caps along the transducer axis is increased to a quadruple value of the deflection of the slats, so that the relatively small oscillation amplitudes of the tube is transformed in its longitudinal direction into a fairly large transmission power in the radial direction.
  • the transducer Due to the small dimensions of the transducer with respect to the wavelength of the sound waves emitted by it at an operating frequency of, for example, 2 kHz, the transducer has an omnidirectional emission.
  • the transmitting transducer radiates broadband and is also advantageously used in the transmitting part of an underwater towed antenna.
  • the end caps preferably with the tube axis coaxial through holes
  • the tube shell is provided with openings and supported the end caps on its circumference inside a filled with oil or gel hose of an underwater towed antenna on the hose wall.
  • the gap between the end caps between the elastic sheath and the tube wall is hermetically sealed and filled with oil or gel.
  • Fig. 1 is in side view and in Fig. 2 a piezoelectric actuator 11 shown in section, as in the embodiments of the electro-acoustic transducer according to Fig. 4 to 10 is used.
  • the actuator 11 oscillates longitudinally, ie in the direction of its longitudinal axis 12, as indicated by the double arrow 13 symbolizing the oscillating movement.
  • the actuator 11 has a tube 14 with a tubular axis in the direction of the tube axis, which forms the longitudinal axis 12 of the actuator 11, elastic tube wall 141 and at least one firmly connected to the tube wall 141 composite module 15. With only one composite module 15, this would be arranged around the tube wall 141 around.
  • the tube wall 141 is covered with a plurality of composite modules 15 which are arranged spaced apart in the circumferential direction and in the axial direction of the tube wall 141.
  • the tube 14 is open at the ends, but may also be closed at the ends for certain applications, as in Fig. 2 indicated by the two dashed lines End plates 16, 17 is illustrated.
  • the solid connection of the composite modules 15 with the pipe wall 141 for example, by gluing or lamination of the composite modules 15 on the pipe wall 141, wherein in the embodiment of Fig. 1 and 2 the composite modules 15 are applied to the inner surface 141 a of the pipe wall 141.
  • the composite modules 15 can also be arranged on the outer surface 141b of the tube wall 141, as shown in FIG Fig. 5 is illustrated. It is also advantageous to cover the tube wall 141 alternately on the outer surface 141b and on the inner surface 141a with the composite modules 15.
  • the tube 14 is preferably made of a plastic material which is reinforced to increase the compressive strength of the tube 12 with glass fibers or carbon fibers. In such a plastic pipe, the solid connection of the composite modules 15 with the pipe wall 141 is advantageously carried out by laminating or lamination of the composite modules 15 on or in the pipe wall 141 during pipe production.
  • Fig. 3 is an exploded view of the structure of a composite module 15 illustrated.
  • the composite module 15 has two congruent film layers 18, 19 of electrically insulating material, on whose mutually facing layer surfaces in each case an electrode structure 20 or 21 arranged, for example printed, is.
  • the elongate piezoceramic fibers 22 have, for example, a square or rectangular cross section.
  • the spaces between the piezoceramic fibers 22 are filled with an electrically insulating material, for example with a polymer, which is in Fig. 3 for the sake of clarity is not shown.
  • the two electrode structures 20, 21 are identical.
  • Each electrode structure 20 or 21 has two identically formed, comb-like structural parts 23, 24 with a conductor path 25 or 26 extending in the direction of the piezoceramic fibers 22 and integrally outgoing, preferably parallel, finger-like electrodes 27, 28.
  • the two comb-like structural parts 23, 24 engage each other with their electrodes 27, 28, so that in each case one electrode 27 of the one structural part 23 and one electrode 28 of the other structural part 24 of the electrical structures 20 and 21 adjacent are and run parallel to each other. Electrodes 27, 28 arranged in this way are therefore also referred to as "interdigitated electrods".
  • the two film layers 18, 19 are mirror images of mutually facing electrode structures 20, 21 placed on the piezoceramic fibers 22, wherein only the electrodes 27, 28 contact the piezoceramic fibers 22 on their opposite longitudinal sides.
  • a composite module 15 is known and eg in EP 1 983 584 A2 described there and called "Piezoelectric Macro-Fiber Composite Actuator".
  • the composite modules 15 connected to the pipe wall 141 are aligned on the pipe 14 in such a way that the piezoceramic fibers 22 run parallel to the pipe axis. As in Fig.
  • Fig. 4 is a first embodiment of an electroacoustic transducer in side view and partially cut shown, in which the described actuator 11 is inserted.
  • Tonpilz construction is realized in the electro-acoustic transducer.
  • a front mass 29 and a much larger back mass 30 is fixed, with front and back mass 29, 30 terminate the pipe 14 frontally watertight.
  • the composite modules 15 are laminated in the tube wall 141, wherein of the plurality of Composite modules 15 in the sectional view of three axially superimposed composite modules 15 can be seen.
  • the terminals 43 (+) and 42 (-) of the electrode structures 20, 21 are led into the interior of the tube 14 and here connected to a drive circuit 31.
  • the drive circuit has a DC voltage source 32, which supplies the positive and negative bias voltage for the electrodes 27, 28, and an AC voltage source 33, which excites the actuator 11 to vibrate, whereby the transducer via the front mass 39, sound waves 35 in the axial direction, radiates.
  • the AC voltage is superimposed on the bias voltage in an adder 34 so that it does not fall below the bias voltage.
  • the electroacoustic transducer in so-called. "Flextensional" construction is realized, which is characterized in that taking place in the longitudinal axis 12 oscillating movement (double arrow 13 in Fig. 5 ) of the actuator 11 is transformed into a radially radiated sound waves 36.
  • this electroacoustic transducer whose actuator 11 is identical to Fig. 1 to 3 is formed, the ends of a tubular wall 141 enclosing, curved, elastic sheath 37 are fixedly connected to the tube ends of the tube 14.
  • the sheath ends can be fastened directly to the pipe wall 141 or else - as is not shown here - be attached to a front ring, wherein the two end rings are in turn firmly connected to the end faces of the tube 12.
  • the elastic sheath 37 is convex curved, but this may also be concavely curved using said end rings.
  • the again in the axial and circumferential direction spaced from each other arranged composite modules 15 are glued or laminated with identical orientation of the piezoceramic fibers on the outside of the tube wall 141, as shown in the sectional view of Fig. 5 you can see.
  • the between shell 37 and pipe wall 141 forming gap 41 is filled with a medium whose characteristic impedance is equal to that of the surrounding water.
  • a gel or an insulating liquid, such as oil is preferably used.
  • electroacoustic transducer unites the Fig. 4 described Tonpilz-Bau us with the Fig. 5 described "flextensional" design and has the properties of both transducer types, so that sound waves 35 and 36 both in the direction of the longitudinal axis of the actuator 11 (as in Fig. 4 ) as well as transversely to the longitudinal axis of the actuator 11 in the radial direction (as Fig. 5 ) are radiated.
  • the pipe ends with front and back masses 29, 30 are closed and the shell 37 is attached to the pipe ends.
  • Fig. 7 in side view, partly cut and Fig. 8 in cross-section represented electro-acoustic transducer as another embodiment corresponds largely to the in Fig. 5 shown and described, electro-acoustic transducer in "flextensional" design, but has an additional design measure a significantly higher acoustic performance, when used as a transmitting transducer so a much greater transmission power.
  • the actuator 11 is arranged in a hollow ring 38 having an elliptical cross section so that the tube wall 141 extends along the length ellipse axis and is supported on the front side in the upper and lower base of the hollow ring 38.
  • the hollow ring 38 consists of a tube wall 141 on the outside covering, convex outer shell 381, which includes a first cavity 39 with the tube wall 141, and the tube wall 141 inside, ie inside the tube, concealing, concave inner shell 382, with the tube wall 141 a second cavity 40 includes.
  • the two shells 381, 382 are elastic, so that the hollow ring 38 bulges or narrows when expansion and contraction of the tube 14.
  • the two cavities 39, 40 are filled with a medium whose characteristic impedance is equal to that of the surrounding water.
  • the medium used is preferably gel or an electrically insulating liquid, such as oil.
  • the composite modules 15 which are in turn arranged circumferentially and axially spaced from each other, both on the inner surface 141 a of the tube wall 141 and on the outer surface 141 b of the tube wall 141 arranged and fixed, for example by gluing or lamination.
  • the swinging movement of the actuator 11th in its longitudinal axis 12 is transformed into a radial oscillatory movement of the hollow ring 38, so that sound waves are emitted transversely to the longitudinal axis 12 of the transducer, as in Fig. 5 outlined.
  • transducers according to Fig. 5 and 7 are particularly suitable for use in underwater towed antennas, since they can be easily adapted in their radial dimensions to the inner diameter of the tube of the underwater antenna, are positioned in the radial direction through the hose and through its hollow interior advantageously the traction cable of the towed antenna and the electrical connections for the converter can be passed.
  • FIGS. 9 and 10 show a further embodiment of an electroacoustic transducer, with the in Fig. 1 to 3 illustrated actuator 11 is equipped.
  • a radially projecting end cap 44, 45 is attached at each end face of the tube 14.
  • a plurality of concave curved, oscillatory blades 46 preferably made of plastic, clamped.
  • the end caps 44, 45 are formed in the embodiment as a circular plates.
  • the fins 46 are juxtaposed with small gaps 48 remaining therebetween and secured with their ends to the end caps 44,45.
  • the end caps 44, 45 may also be designed as polygonal plates whose number of edges corresponds to the number of lamellae 46, wherein the lamella ends each lie on one of the flat surface extending between the edges and are fixed.
  • the juxtaposed, the tube 14 surrounding lamellae 44 are outside, ie on its side facing away from the tube 14 outside, enclosed by a fluid-tight, elastic sheath 47, which covers the gap 48 between the fins 44 liquid-tight.
  • the sheath 47 is fluid-tightly attached to the end caps 44, 45 at the ends.
  • the end caps 44, 45 have in their bounded by the end faces of the tube 14 each area a through hole 49 and 50, which is preferably introduced coaxially with the tube axis as a bore with a bore diameter which is smaller than the inside diameter of the pipe 14th.
  • a through hole 49 and 50 which is preferably introduced coaxially with the tube axis as a bore with a bore diameter which is smaller than the inside diameter of the pipe 14th.
  • the described electroacoustic transducer is in its design with circular end caps 44, 45 excellent for use in Univivasser towed antennas.
  • the radial dimensions of the transducer are adapted to the diameter of the hose 51 of the towed antenna, so that in the longitudinal direction of the hose 51 successively arranged transducers are supported via their end caps 44, 45 radially on the hose wall and are thus radially positioned.
  • the tube 51 is pulled through, in Fig. 9 Traction cable of the towed antenna, not shown, as well as connection lines for the individual transducers are guided through the hollow interior of the tubes 14 of the transducers.
  • the tube 51 is usually filled with an oil or a gel, so that the tube interior and, since the tube is provided with a plurality of openings 5 '3, for example holes or slits, also the space enclosed by the sheath 47 with this Oil or gel is filled.
  • the gap 52 between the sheath 47 and the tube wall of the tube 51 resulting from the insertion of the transducers into the tube 51 is hermetic, extending between the end caps 44,45 completed and filled with the same oil or gel.

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

Claims (9)

  1. Transducteur électro-acoustique comprenant un actionneur piézoélectrique (11) oscillant longitudinalement lors de l'application d'une tension alternative,
    caractérisé en ce que
    l'actionneur (11) présente un tube (14) composé d'une matière plastique renforcée par fibres de verre ou par fibres de carbone avec une paroi de tube (141) élastique dans la direction de l'axe de tube (12) et plusieurs modules composites (15) agencés espacés respectivement les uns des autres dans le sens périphérique du tube et dans le sens longitudinal du tube et solidement fixés à la paroi de tube (141), chacun des modules composites (15) présente des structures d'électrodes (20, 21) agencées sur au moins deux couches de film (18, 19) en un matériau isolant électrique avec des électrodes (27, 28) parallèles, en forme de doigts, espacées les unes des autres et des fibres piézocéramiques (22) parallèles espacées les unes de autres agencées entre les couches de film (18, 19) avec des structures d'électrodes (20, 21) posées dessus, les électrodes (27, 28) établissant un contact sur les faces longitudinales détournées l'une de l'autre desdites fibres piézocéramiques, en ce que les modules composites (15) sont orientés sur la paroi de tube (14) de telle sorte que les fibres piézocéramiques (22) s'étendent parallèles à l'axe de tube (12), et en ce qu'une tension continue est appliquée aux structures d'électrodes (20, 21) de sorte que, sur des électrodes (27, 28) parallèles successives le long des fibres piézocéramiques (22) dans chaque structure d'électrodes (20, 21), un potentiel de tension continue élevé et un potentiel de tension continue faible alternent et il y a respectivement un potentiel de tension continue identique sur les électrodes (27 ou 28) des structures d'électrodes (20, 21) se trouvant des deux côtés des fibres piézocéramiques (22) s'appuyant par paires contre des faces longitudinales des fibres piézocéramiques (22) détournées l'une de l'autre, et en ce qu'une tension alternative peut être appliquée sur les structures d'électrodes (20, 21).
  2. Transducteur électro-acoustique selon la revendication 1,
    caractérisé en ce que
    la fixation solide des modules composites (15) à la paroi de tube (14) est réalisée par collage ou par stratification en insert ou en revêtement.
  3. Transducteur électro-acoustique selon la revendication 1 ou 2,
    caractérisé en ce que
    le tube (14) est fermé côté extrémité de manière étanche à l'eau.
  4. Transducteur électro-acoustique selon l'une des revendications 1 à 3,
    caractérisé en ce que
    sur les deux faces frontales du tube (14) sont fixées une masse avant (29) et une masse arrière (30), qui ferment le tube (14) de manière étanche à l'eau.
  5. Transducteur électro-acoustique selon l'une des revendications 1 à 4,
    caractérisé en ce que
    les extrémités d'une enveloppe bombée (37) entourant la paroi de tube (14) sont solidement fixées aux extrémités de tube du tube (14) et en ce que l'espace intermédiaire (41) entre la paroi de tube (141) et l'enveloppe (37) est rempli avec un milieu, de préférence un gel ou un liquide, dont l'impédance caractéristique est identique à celle du milieu environnant, de préférence de l'eau.
  6. Transducteur électro-acoustique selon l'une des revendications 1 à 4,
    caractérisé en ce que
    la paroi de tube (141) du tube (14) est reçue dans une bague creuse (38) avec une section transversale elliptique, qui est formée par une coque externe (381) convexe recouvrant l'extérieur de la paroi de tube (141), entourant avec la paroi de tube (141) un premier espace creux (39) et une coque interne (382) concave recouvrant la paroi de tube (141) à l'intérieur du tube, entourant avec la paroi de tube (14) un second espace creux (40) et en ce que les extrémités de la coque interne et externe (381, 382) sont solidement fixées aux extrémités de tube (141) du tube (14), et le premier et le second espaces creux (39, 40) sont remplis avec un milieu, de préférence un gel ou un liquide, dont l'impédance caractéristique est identique à celle du milieu environnant, de préférence de l'eau.
  7. Transducteur électro-acoustique selon la revendication 1 ou 2,
    caractérisé en ce que
    sur chaque face frontale du tube (14) est fixé un capuchon d'extrémité (44, 45) dépassant radialement, de préférence en forme de plaque, en ce qu'entre les deux capuchons d'extrémité (44, 45) sont montées plusieurs lamelles courbées de manière concave (46) qui sont fixées côté extrémité aux capuchons d'extrémité (44, 45) dans leur sens périphérique les unes à côté des autres avec une distance d'interstice, et en ce qu'une enveloppe élastique (47) entourant les lamelles (46) sur l'extérieur est fixée côté extrémité aux capuchons d'extrémité (44, 45) de manière étanche aux fluides.
  8. Antenne remorquée sous-marine comprenant un tuyau (51) rempli d'huile ou de gel et au moins un transducteur électro-acoustique selon la revendication 7 logé dans le tuyau (51),
    caractérisée en ce que
    chaque capuchon d'extrémité (44, 45) dans sa zone limitée par la face frontale du tube (14) présente une ouverture de passage (49, 50) de préférence coaxiale avec l'axe de tube, en ce que l'enveloppe de tube (141) du tube (14) est pourvue de perforations (53) et en ce que les capuchons d'extrémité (44, 45) s'appuient sur la paroi de tuyau sur toute leur périphérie.
  9. Antenne remorquée sous-marine selon la revendication 8,
    caractérisée en ce que
    l'espace intermédiaire (52) s'étendant entre les capuchons d'extrémité (44, 45) enfermé par l'enveloppe élastique (47) et la paroi de tuyau du tuyau (51) est fermé hermétiquement et rempli d'huile ou de gel.
EP09744932.6A 2009-09-22 2009-09-22 Transducteur électro-acoustique Not-in-force EP2480346B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DE2009/001332 WO2011035744A1 (fr) 2009-09-22 2009-09-22 Transducteur électro-acoustique

Publications (2)

Publication Number Publication Date
EP2480346A1 EP2480346A1 (fr) 2012-08-01
EP2480346B1 true EP2480346B1 (fr) 2013-08-07

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EP09744932.6A Not-in-force EP2480346B1 (fr) 2009-09-22 2009-09-22 Transducteur électro-acoustique

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EP (1) EP2480346B1 (fr)
DE (1) DE112009005265A5 (fr)
WO (1) WO2011035744A1 (fr)

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Publication number Priority date Publication date Assignee Title
CN109935223B (zh) * 2017-12-19 2021-04-20 北京长城电子装备有限责任公司 一种超小尺寸低频发射换能器
CN109870718A (zh) * 2019-02-03 2019-06-11 沈永进 压电陶瓷浅层全波勘探换能器
DE102021208106A1 (de) 2021-07-27 2023-02-02 Atlas Elektronik Gmbh Schleppantenne mit einem Drucksensor

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5229978A (en) * 1991-10-04 1993-07-20 Raytheon Company Electro-acoustic transducers
US6629341B2 (en) * 1999-10-29 2003-10-07 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Method of fabricating a piezoelectric composite apparatus
US6711096B1 (en) * 2002-09-11 2004-03-23 The United States Of America As Represented By The Secretary Of The Navy Shaped piezoelectric composite array

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EP2480346A1 (fr) 2012-08-01
WO2011035744A1 (fr) 2011-03-31
DE112009005265A5 (de) 2012-11-15

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