EP1474797A2 - Akustische oberflächenantenne - Google Patents

Akustische oberflächenantenne

Info

Publication number
EP1474797A2
EP1474797A2 EP03720614A EP03720614A EP1474797A2 EP 1474797 A2 EP1474797 A2 EP 1474797A2 EP 03720614 A EP03720614 A EP 03720614A EP 03720614 A EP03720614 A EP 03720614A EP 1474797 A2 EP1474797 A2 EP 1474797A2
Authority
EP
European Patent Office
Prior art keywords
sensors
antenna
pressure sensors
antenna according
speed
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.)
Granted
Application number
EP03720614A
Other languages
English (en)
French (fr)
Other versions
EP1474797B1 (de
Inventor
Luc Thales Intellectual Property FRANCOIS
Eric Thales Intellectual Property Sernit
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
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thales SA filed Critical Thales SA
Publication of EP1474797A2 publication Critical patent/EP1474797A2/de
Application granted granted Critical
Publication of EP1474797B1 publication Critical patent/EP1474797B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/004—Mounting transducers, e.g. provided with mechanical moving or orienting device
    • G10K11/006—Transducer mounting in underwater equipment, e.g. sonobuoys
    • G10K11/008—Arrays of transducers
    • 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
    • B06B1/0688—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 with foil-type piezoelectric elements, e.g. PVDF

Definitions

  • the present invention relates to acoustic antennas for receiving low frequency underwater waves. It relates more particularly to so-called surface antennas, the sensors of which are in the form of piezoelectric films generally made with Poly Vinylidene Fluoride, known as PVDF.
  • the directivity of the sensors is, in open water, omnidirectional (they are small compared to the central wavelength of the listening frequency band), the shell cannot be coated with a baffle with low acoustic impedance which would improve the acoustic discretion of the submarine, since the directivity would then be variable and not controllable.
  • the invention proposes combining particle pressure sensors with pressure sensors so that each receiving panel is directive.
  • the invention provides a surface acoustic antenna, of the type comprising a set of flat pressure sensors made of plastic piezoelectric material fixed planarly in a support structure, mainly characterized in that some of these sensors are replaced by speed sensors particle placed in such a way that the combination of the signal from the pressure sensors with the signal from the speed sensors makes it possible to obtain a cardioid having a zero of reception normal to one of the faces of the antenna.
  • the particulate speed sensors are formed by geophones encapsulated in a mass of syntactic foam whose density is the same as that of the coating material of all the sensors of the antenna.
  • connection bridges which are curved in a V shape to form gutters making it possible to maintain the connection wires of the particulate speed sensors during the molding operations of the assembly of the antenna.
  • the surface comprising all of the sensors substantially forms a curved plane on the surface of the hull of a load-bearing building, and the zero of the cardioid is directed towards said hull.
  • the carrying vessel is a submarine.
  • the antenna comprises at least one panel comprising 15 pressure sensors and 6 speed sensors regularly inserted between these pressure sensors.
  • FIG. 3 a perspective view of a geophone used in an antenna according to the invention.
  • a surface acoustic antenna for submarines as described in French Patent No. 2,691,596 is essentially characterized in that each panel includes Particulate velocity sensors whose axis of sensitivity is normal to the plane of the panel and in that the corresponding phase center is coincident with the phase center of the pressure sensors, thus making it possible to obtain a directivity in cardioid.
  • FIG. 1 represents a view of the pressure sensors situated inside a panel according to the prior art and corresponds to FIG. 5 of French patent No. 2,691,596. It will be recalled that the pressure sensor has a bimorph structure that is, it is formed by two layers of PVDF piezoelectric film separated by a central electrode forming the hot spot. The two layers are covered with 2 external electrodes which are electrically connected to form the cold spot.
  • FIG. 1 is a flat cross section of the panel at the height of the central or external electrodes.
  • Each electrode is formed by a set of square plates 10 connected by narrow bridges 11.
  • the 2 connections 12 of the output signal are located at one end of the set.
  • FIG. 2 represents a view of the panel modified according to the invention, in the same section as in FIG. 1.
  • Speed sensors 20 are installed at locations chosen to make the 2 phase centers corresponding to the 2 signals measuring the coincidence pressure and speed component normal to the panel. This result is obtained geometrically using the symmetry of the places where the measurements are made.
  • 6 of the 21 pressure sensors are removed and 6 speed sensors 20 are placed in the center of the spaces thus provided.
  • the speed sensors are geophones 301 encapsulated in a syntactic foam 302 having the same density as the polyurethane coating in which the pressure sensors are molded, as described in the French patent. 2,691,596.
  • the serial wiring of the geophones is shown in FIG. 2 and does not have any particular characteristics, except that the bridges 21 are V-shaped, so as to form a gutter making it possible to reduce the displacement of the cables during molding, as can also be seen in FIG. 4.
  • the connector 12 there are 2 wires for the omnidirectional pressure signal from the panels 10, and 2 wires for the speed signal from the sensors 20.
  • the directivity of the signal from the sensors 20 is in cos theta, where theta is l angle of incidence of the wave with respect to the axis of sensitivity of the sensor.
  • the addition of these 2 signals provides a signal whose directivity is in the form of a cardioid, with the direction of "zero" normal to the panel and oriented towards the rear, therefore towards the shell.
  • FIG. 4 represents, in a perspective view, a panel according to the invention before molding, and FIG. 5 such a panel after molding by casting of a suitable polyurethane material 50 whose level arrives flush with the upper part of the geophones .
  • a layer of neoprene with the same composition as that of the envelope 40 is poured over it.
  • the panel thus obtained can be installed directly on the hull of the submarine, or on a material with low acoustic impedance deposited on the hull, which thus improves the acoustic discretion of the submarine.
  • the geophones can be replaced by accelerometers or any other directional sensor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Details Of Aerials (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
EP03720614.1A 2002-02-15 2003-02-14 Akustische oberflächenantenne Expired - Lifetime EP1474797B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0201940A FR2836076B1 (fr) 2002-02-15 2002-02-15 Antenne acoustique surfacique pour sous-marins
FR0201940 2002-02-15
PCT/FR2003/000488 WO2003069594A2 (fr) 2002-02-15 2003-02-14 Antenne acoustique surfacique pour sous-marins

Publications (2)

Publication Number Publication Date
EP1474797A2 true EP1474797A2 (de) 2004-11-10
EP1474797B1 EP1474797B1 (de) 2015-08-12

Family

ID=27636217

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03720614.1A Expired - Lifetime EP1474797B1 (de) 2002-02-15 2003-02-14 Akustische oberflächenantenne

Country Status (6)

Country Link
US (1) US7180827B2 (de)
EP (1) EP1474797B1 (de)
JP (1) JP2005523594A (de)
CA (1) CA2475692C (de)
FR (1) FR2836076B1 (de)
WO (1) WO2003069594A2 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005045376A1 (en) * 2003-11-10 2005-05-19 Brüel & Kjær A method of determining the sound pressure resulting from a surface element of a sound emitting surface
GB2474461B (en) * 2009-10-14 2016-08-31 Thales Holdings Uk Plc Electronic baffling of sensor arrays
JP6654106B2 (ja) * 2016-06-21 2020-02-26 ジェイ・アール・シー特機株式会社 音波監視装置および航走体

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2536622B1 (fr) * 1982-11-19 1986-03-07 Thomson Csf Hydrophone de vitesse
US4974213A (en) * 1988-12-16 1990-11-27 Siwecki Thomas L Passive active underwater sound detection apparatus
FR2685848B1 (fr) * 1991-12-26 1994-02-25 Thomson Csf Antenne acoustique lineaire.
FR2691596B1 (fr) * 1992-05-22 1995-04-28 Thomson Csf Antenne acoustique sous-marine à capteur surfacique.
US6341661B1 (en) * 2000-04-19 2002-01-29 L3 Communications Corporation Bow dome sonar

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03069594A2 *

Also Published As

Publication number Publication date
US20050157590A1 (en) 2005-07-21
CA2475692C (fr) 2013-04-16
WO2003069594A3 (fr) 2004-04-08
FR2836076A1 (fr) 2003-08-22
EP1474797B1 (de) 2015-08-12
CA2475692A1 (fr) 2003-08-21
JP2005523594A (ja) 2005-08-04
FR2836076B1 (fr) 2005-10-14
WO2003069594A2 (fr) 2003-08-21
US7180827B2 (en) 2007-02-20

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