WO2011035747A1 - Electroacoustic transducer - Google Patents

Electroacoustic transducer

Info

Publication number
WO2011035747A1
WO2011035747A1 PCT/DE2009/001335 DE2009001335W WO2011035747A1 WO 2011035747 A1 WO2011035747 A1 WO 2011035747A1 DE 2009001335 W DE2009001335 W DE 2009001335W WO 2011035747 A1 WO2011035747 A1 WO 2011035747A1
Authority
WO
Grant status
Application
Patent type
Prior art keywords
composite
transducer
body
electrodes
annular
Prior art date
Application number
PCT/DE2009/001335
Other languages
German (de)
French (fr)
Inventor
Rainer Busch
Original Assignee
Atlas Elektronik Gmbh
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

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS
    • G01V1/00Seismology; Seismic or acoustic prospecting or detecting
    • G01V1/16Receiving elements for seismic signals; Arrangements or adaptations of receiving elements
    • G01V1/20Arrangements of receiving elements, e.g. geophone pattern
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B06GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06BMETHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/06Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezo-electric effect or with electrostriction
    • B06B1/0644Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezo-electric effect or with electrostriction using a single piezo-electric element

Abstract

An electroacoustic transducer (10) is disclosed, comprising a ring member (11) that contains piezoceramic material and electrodes which contact said material. In order to keep the size and weight of the transducer (10) low while obtaining a sufficiently high acoustic power, the ring member (11) is composed of multiple annular, flat composite modules (16) which rest against each other in the radial direction of the ring member (11). Each composite module (16) has axially spaced-apart piezoceramic fibers which extend in the circumferential direction of the ring member (11), and spaced-apart electrodes which extend transverse to the piezoceramic fibers and contact the same on the longitudinal sides thereof that are radially opposite each other.

Description

The invention relates to an electroacoustic transducer according to the preamble of claim 1.

A known, flexible, inhaul and deployable and storable as winding, electroacoustic transmitting antenna for underwater use, in particular as redrawn from a vessel towed antenna, a so-called. Strea- mer (DE 10 2004 038 034 A1), has a flexible, sound-transparent and oil - or gel-filled tube and in the tube in the longitudinal direction spaced from each other on which are arranged electro-acoustical transmitting transducer, which are supported on the tube wall. Each transmission transducer has an annular body which is composed of a plurality of piezoceramic ring segments and the outside carries the ring segments a fixing fiberglass wrapping. Each ring segment is covered on its radially directed side surface with an electrode. Leading to the electrodes, axially aligned electrode terminals of the ring body are alternately led out on one side and the other end of the annular body and connected there with each other in the circumferential direction. When switching an alternating electrical voltage to the two end connections of the electrode terminals ring expansion and contraction of the individual ring segments in the circumferential direction of the annular body is carried out. This "breathing" of the ring body in the radial direction, that it expands and contracts, .wobei the size of the "breathing", ie the expansion and contraction of the annular body, by the size of the AC voltage and frequency of the "breathing" by the frequency of the AC voltage is determined. The expansion and contraction of the annular body is directly transferred to the tube wall and is coupled as a sound pressure in the water.

The invention has for its object to provide an electroacoustic transducer in a ring shape for underwater use with a sufficiently high acoustic power, which is characterized by small size and light weight.

The object is achieved by the features in claim. 1

The transducer according to the invention, electroacoustic has the advantage that there is with the very thin composite modules, each only of a epoxidge--bound layer of which expresses cross section small piezo-ceramic fibers with both sides resting, thin electrodes, a working in the low frequency range, dimension smaller transducer with a maximum diameter of 30 mm can be realized, for example, 80 mm and an axial thickness of, for example, which offers optimum properties for use in underwater towed antennas. The acoustic performance of the transducer can be adjusted by the number of radially adjacent, annular composite modules. Due to the small dimensions of the transducer with respect to the wavelength of the sound waves from it the transducer has an omnidirectional radiation pattern. The converter has a low weight, which is equipped with such transducers tow antennas can be trimmed much easier.

Expedient embodiments of the invention, the electroacoustic transducer with advantageous developments and refinements of the invention emerge from the further claims.

According to an advantageous embodiment of the invention, each arranged on one of the longitudinal sides of the piezoelectric ceramic fibers electrodes on a flexible film of electrically insulating material such as polyimide film provided and the two films are firmly joined together. By this, an encapsulation of the piezo-ceramic fibers and the electrode in an electrically insulating material rendes effecting connection of the films, the composite module against harmful environmental influences, especially against water or oil in underwater use is reliably protected.

According to an advantageous embodiment of the invention, the electrodes of each composite module with a DC voltage are assigned so that a to the on a film adjacent electrodes alternately a high and a low DC potential and to the mutually directly opposite to the piezo ceramic fibers electrodes on the two films in each case the same DC potential, and an AC voltage is connectable to the electrodes. For this circuit, the composite module which is identical in all the superposed composite modules of the annular body, the composite modules on the one hand operated at a higher DC voltage, and on the other hand, a larger piezoelectric effect and thus a larger stroke of the ring body in the radial direction with respect to the bridged AC voltage can be obtained. As a result of the larger DC voltage can also be applied AC voltage must always be less than the applied DC voltage, selected to be larger, and thus the acoustic performance of the transducer can be increased.

According to an alternative embodiment of the invention it is also possible to coat the electrodes of each composite module to the DC voltage so that a high and on the disposed on the other film electrode is located on the on one film arranged electrodes, a low DC voltage potential, wherein the electrodes in turn, an alternating voltage is connectable. In this application, the composite modules, it is possible to operate it with a much smaller DC. However, this is paid for with a smaller piezoelectric effect and thus a lower acoustic performance of the transducer. However, such transducers can get there advantageous for applications where a smaller DC power supply is required. According to an advantageous embodiment of the invention, the composite modules are laminated on each other or adhered to each other, thereby advantageously provide a self-rigid annular body with light weight.

According to an advantageous embodiment of the invention the annular body seated on an elastic carrier, which is preferably made with glass or carbon fibers prepared reinforced plastics material, and is preferably designed as a tube. Thereby, the converter can be realized with a smaller number of successive arranged composite modules with which an egg gensteifigkeit of the annular body may not be obtained. Also, the already inherently rigid ring body may be placed on such a support, to increase the compressive strength of the transducer for underwater use at greater depths.

The converter described has advantageous properties for use in underwater towing antennas. To this end, according to an advantageous embodiment of the invention, the transducer is inserted into an advantageously expanded in diameter tube of the underwater trailing antenna, that the annular body bears with its circumference against the hose wall. After return of the diameter enlargement, then the tube wall is non-positively to the ring body and fixes it securely in the predetermined position. The expanded diameter is preferably realized by generated in the tube pressure. The hollow ring body or the hollow support makes it possible to move the hose by pulling in underwater towed antenna tension cables and connection lines for the transducers centrally in the tube.

The invention is described in more detail based on shown in the drawings embodiments below. These show, in a schematic representation:

Fig. 1 is a front view of an electroacoustic transducer in a perspective view, Fig. 2 is a plan view of an electroacoustic transducer according to a second embodiment,

Fig. 3 a detail of a partially cut tubing to a

. Underwater Towed antenna used with transducers of FIG 1,

Fig. 4 is an enlarged partial processing of two superimposed composite modules in the electric converter according to Fig. 1 or 2, in exploded view,

Fig. 5 a detail of a perspective view of a composite layer with embedded in an electrically insulating material, cross-sectional small piezo ceramic fibers in the composite modules according to Fig. 4,

Fig. 6 shows the same illustration as in Fig. 4 with modified composite modules.

The illustrated in Fig. 1 in a perspective front view electro-acoustic transducer 10 is preferably operated as a transmitting transducer in an underwater towed antenna, as is partial illustrated in Fig. 3. The transducer 10 has an annular body 11 having enclosed therein, piezoelectric material and this contacting electrode and is supported non-positively in its integration into the underwater towed antenna with the periphery of its annular body at the tube wall 121 of a tube 12 from. In order to realize an elongated towed antenna several such converters 10 are arranged in the tube 12 at an axial distance behind each other. A commonly the hose 12 by pulling rope 13, and connecting lines not shown here for the transducer 10 are centrally passed through the hollow interior of the tube 12th The tension cable 13, which can also be a flexible tube receiving the connecting cables is, supported on the tubular wall 121 by means of spacers fourteenth The tube 12 is closed at the end and filled with an oil 15, or a gel.

The annular body 11 of the electroacoustic transducer 10 is superposed from several, in the radial direction of the annular body 11, composed of annular flat composite module 16, wherein the superposed composite modules 16 laminated on each other or are glued, so that after a certain number of superimposed Composite - modules 16 results in an inherent stability of the electroacoustic transducer 10th the innermost annular composite module 16 laminated to an elastic support 17 or glued and applied to them, the further composite modules 16 by laminating or gluing - alternatively - as sketched in Fig. 2. This has the advantage that with a smaller number of composite modules 16 a pressure-resistant converter 10 can be realized for underwater use. In the embodiment of FIG. 2, the elastic support 17 is designed as a hollow ring 18 made of plastic, preferably with embedded glass or carbon fibers so that the center in the use of the transducer 10 in the sketched in Fig. 3 underwater antenna still pull cable 13 and cables through the concatenation ranking the transducer 10 can be passed. A thus constructed, for example, electro-acoustic transducer has a maximum outer diameter of d = 80 mm and an axial width b = 30 mm, has an extremely low weight, and operates in tieffre--frequency range.

Each underlying in the annular body 11 in radial direction, annular, extending over about 360 °, the flat composite module 16 has axially spaced apart and extending in the circumferential direction of the annular body 11 piezoceramic fibers 19 and transverse thereto spaced from one another extending electrodes 20, 21 which contacting the piezoceramic fibers 19 in the radially facing away from each longitudinal side. In FIG. 4, the processing of two in the ring body 11 is composite modules 16 outlines superimposed fragmentary and exploded. Each composite module 16 has a width corresponding to the width of the annular body 11 and an axial length of approximately n * d, where d is the mean diameter of the annular body. 11 b, In each composite module 16, the electrodes 20, 21 part of an electrode structure 22, 23, wherein a respective electrode structure 22 on a flexible film 24 and 25 of electrically insulating material, for example. Example, on a polyimide film, is applied, for example, is printed. In each electrode structure 22, 23 are elongated, finger-like electrodes 20, 21 in the longitudinal direction of the film 24 and 25 alternately side by side and mutually spaced apart, said electrodes 20 at its one end via a longitudinal direction of the film 24 or 25, extending conductor track 26 and the electrodes 21 are connected at one end by a likewise in the longitudinal direction of the film 24 and 25 extending conductor path 27 with each other, so that on each film 24 and 25, two comb-like structure parts 31, 32 are present, the interengaging to grab. The electrode structures 22, 23 are arranged on the mutually facing film surfaces of the films 24, 25th To visualize on the lower film surface of the upper in Fig. 4 film 24 of each composite module 16 applied electrode structure 22, the electrode structure 22 with its electrodes 20, 21 and their conductor tracks 26, dashed lines 27 is shown in Fig. 4. Between the two electrode structures 22, 23 extend in the longitudinal direction of the films 24, 25 extending piezoceramic fibers 19 which are aligned with each other in parallel. The elongated piezoceramic fibers 19 have, for example a square or rectangular cross-section and the spaces 29 between the piezoceramic fibers 19 are provided with an electrically insulating material, eg. As with a polymer or epoxy, filled (which is not shown in Fig. 4 for clarity), so that a composite or composite layer 28 results, as it is shown in perspective and partial in Fig. 5. The two films 24, 25 are mirror images placed with the facing electrode patterns 22, 23 on the piezo-ceramic fibers 19, with only the electrodes 20, 21 of the electrode structures 22, 23 (and not the conductor tracks 26, 27), the piezoceramic fibers 19 on their mutually remote longitudinal sides to contact. The two films 24, 25 are fixedly connected together, are such that the piezoceramic fibers 19 encapsulated with the overlying electrode structures 22, 23 and thus protected against external influences. The composite modules 16 of the type described are known and described for example in EP 1983584 A2 and referred to therein as "Piezoelectric Macro Fiber Composite Actuator".

As is shown in Fig. 4, is connected to each electrode structure 22, 23 set a direct current voltage, wherein each of the structural member 31 is located at a higher DC potential and the structural member 32 at a lower DC potential. This means that the on a film 24 and 25, adjacent electrodes 20, 21 alternately applied to the two films 24, 25 with a high and a low DC potential and the mutually directly opposite to the piezo ceramic fibers 19 electrodes 20 and 21 with a same DC potential. The DC voltage is superimposed on an AC voltage so that the former does not fall below. As a result of the applied AC voltage 19 cause the piezoceramic fibers in all the composite modules 16 in the same direction longitudinal stretching and longitudinal contractions, causing the ring body 1 1 expands and contracts again. When used in an underwater antenna according to Fig. 3, the expansion and contraction of the annular body 11 transmits directly to the tube wall 121 of the tube 12 and is injected as a sound pressure in the water.

Shown in Fig. 6 in perspective and partial processing illustrated composite modules 16 which directly overlie each other in the ring body 1 1 are substantially the same structure, so that identical components are provided with the same reference numerals. They differ from those of Fig. 4 described composite modules 16, characterized in that on the two electrode structures 22, 23 on the films 24, 25, the conductor tracks 26, 27 of the two structural parts 31, 32 connected to each other, and (to a terminal 33 upper film 24) and a terminal 34 (on the lower film 25 are placed). a DC voltage is applied with a superimposed AC voltage to the two terminals 33, 34th This has the consequence that on the one film 24 are arranged electrodes 20, 21 of the electrode structure 22 reversed charged with a high and arranged on the other film 25 electrodes 20, 21 with a low DC voltage potential or are and all electrodes 20, 21, an AC voltage is superimposed. Here, too, thereby the ring body 11 to perform a "breathing" in the radial direction, which are coupled as pressure waves in the surrounding medium. The amplitude but which is significantly lower than in the annulus 11, which is implemented with composite modules 16 of FIG. 4 "breathing". but the required DC voltage for operation of the converter 10 is significantly lower.

All in the foregoing description and in the claims mentioned characteristics are used together according to the invention both individually and in any combination. The invention is therefore not limited to the described and claimed feature combinations. Rather, all combinations of individual features are considered to be revealed.

Claims

claims
Electro-acoustic transducer having a piezo ceramic material and this contacting electrodes (20, 21) containing the annular body (11), characterized in that
the annular body (11) consists of several, in the radial direction of the annular body (11) lying on one another, annular flat composite modules (19) assembled and each composite Ivlodul (16) axially spaced from each other in the circumferential direction of the annular body (11) extending piezo ceramic fibers (19) and transversely thereto spaced apart extending electrodes (20, 21) which contact the piezo ceramic fibers (19) on the radially mutually remote longitudinal sides.
An electroacoustic transducer according to claim 1,
characterized, in that
each of the electrodes located on one of the longitudinal sides of the piezoelectric ceramic fibers (19) (20, 21) on a flexible film (18 or 19) arranged in electrically insulating material and the two films (24, 25), the piezo-ceramic fibers (19) including, are connected together.
An electroacoustic transducer according to claim 1 or 2.,
characterized, in that
the electrodes (20, 21) of each composite module (16) with a DC voltage is such that the on a film (24 or 25), adjacent electrodes (20, 21) alternately a high and a low DC potential and to the to the piezo ceramic fibers (19) to one another directly opposing electrodes (20 and 21) on the films (24, 25) is a respective same DC potential, and that the electrodes (20, 21) an alternating voltage is up switchable.
An electroacoustic transducer according to claim 1 or 2, characterized in that
the electrodes (20, 21) of each composite module (16) with a DC voltage is such that the on a film (24) arranged electrodes (20, 21) a high and (on the other on the film 25 ) arranged electrodes (20, 21) is a low DC voltage potential, and that to the electrode an AC voltage is connectable.
An electroacoustic transducer according to one of claims 1 to 4,
characterized, in that
the annular composite modules (16) laminated on each other or are glued on.
An electroacoustic transducer according to claim 5,
characterized, in that
consisting of the composite modules (16) assembled annular body (11) is inherently stiff.
An electroacoustic transducer according to one of claims 1 to 5,
characterized, in that
consisting of the composite modules (16) assembled annular body (11) on an annular elastic support (17) is seated.
An electroacoustic transducer according to claim 7,
characterized, in that
the carrier (17) made of plastic material, preferably with embedded glass or carbon fibers, there is.
An electroacoustic transducer according to claim 7 or 8,
characterized, in that
the elastic carrier (17) is a hollow ring (18).
An electroacoustic transducer according to one of claims 1 to 9, characterized by its arrangement in an oil or gel-filled tube (12) of an underwater towed antenna, in which the annular body (11) is supported with its circumferential surface frictional contact with the tube wall (121).
PCT/DE2009/001335 2009-09-22 2009-09-22 Electroacoustic transducer WO2011035747A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/DE2009/001335 WO2011035747A1 (en) 2009-09-22 2009-09-22 Electroacoustic transducer

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
PCT/DE2009/001335 WO2011035747A1 (en) 2009-09-22 2009-09-22 Electroacoustic transducer
DE200911005267 DE112009005267A5 (en) 2009-09-22 2009-09-22 Electro-acoustic transducers
EP20090743838 EP2480913A1 (en) 2009-09-22 2009-09-22 Electroacoustic transducer

Publications (1)

Publication Number Publication Date
WO2011035747A1 true true WO2011035747A1 (en) 2011-03-31

Family

ID=43640704

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2009/001335 WO2011035747A1 (en) 2009-09-22 2009-09-22 Electroacoustic transducer

Country Status (3)

Country Link
EP (1) EP2480913A1 (en)
DE (1) DE112009005267A5 (en)
WO (1) WO2011035747A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2516976A (en) * 2013-08-09 2015-02-11 Atlas Elektronik Uk Ltd System for producing sound waves
WO2016063126A1 (en) * 2014-10-23 2016-04-28 Cgg Services Sa Methods and systems for improved active land streamers

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3444424A1 (en) * 1984-12-06 1991-11-07 Krupp Gmbh Wound filament-type transducer array - for multidirectional sonar antenna
WO1999048621A2 (en) * 1998-03-26 1999-09-30 Exogen, Inc. Arrays made from flexible transducer elements
US6310427B1 (en) * 2000-05-03 2001-10-30 Bae Systems Aerospace Inc. Connecting apparatus for electro-acoustic devices
US6477111B1 (en) * 1998-10-29 2002-11-05 Schlumberger Technology Corporation Method of making a marine seismic streamer
DE102004038034A1 (en) * 2004-08-05 2006-02-23 Atlas Elektronik Gmbh Electroacoustic transmitting antenna

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3444424A1 (en) * 1984-12-06 1991-11-07 Krupp Gmbh Wound filament-type transducer array - for multidirectional sonar antenna
WO1999048621A2 (en) * 1998-03-26 1999-09-30 Exogen, Inc. Arrays made from flexible transducer elements
US6477111B1 (en) * 1998-10-29 2002-11-05 Schlumberger Technology Corporation Method of making a marine seismic streamer
US6310427B1 (en) * 2000-05-03 2001-10-30 Bae Systems Aerospace Inc. Connecting apparatus for electro-acoustic devices
DE102004038034A1 (en) * 2004-08-05 2006-02-23 Atlas Elektronik Gmbh Electroacoustic transmitting antenna

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2516976A (en) * 2013-08-09 2015-02-11 Atlas Elektronik Uk Ltd System for producing sound waves
GB2516976B (en) * 2013-08-09 2016-10-12 Atlas Elektronik Uk Ltd System for producing sound waves
WO2016063126A1 (en) * 2014-10-23 2016-04-28 Cgg Services Sa Methods and systems for improved active land streamers

Also Published As

Publication number Publication date Type
DE112009005267A5 (en) 2012-11-15 grant
EP2480913A1 (en) 2012-08-01 application

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