EP0506529B1 - Richtantenne für akustische Niederfrequenzwellen - Google Patents

Richtantenne für akustische Niederfrequenzwellen Download PDF

Info

Publication number
EP0506529B1
EP0506529B1 EP19920400754 EP92400754A EP0506529B1 EP 0506529 B1 EP0506529 B1 EP 0506529B1 EP 19920400754 EP19920400754 EP 19920400754 EP 92400754 A EP92400754 A EP 92400754A EP 0506529 B1 EP0506529 B1 EP 0506529B1
Authority
EP
European Patent Office
Prior art keywords
antenna
front face
antenna according
acoustic
wavelength
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19920400754
Other languages
English (en)
French (fr)
Other versions
EP0506529A1 (de
Inventor
Eric Sernit
Thierry Mazoyer
Jean-Marie Audoli
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
Thomson CSF 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 Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0506529A1 publication Critical patent/EP0506529A1/de
Application granted granted Critical
Publication of EP0506529B1 publication Critical patent/EP0506529B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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

Definitions

  • the present invention relates to acoustic antennas which operate in the low frequency range, that is to say essentially below 5 kHz, and for which it is sought to improve the reception and / or emission diagram.
  • the dimensions of the antenna are then small compared to the wavelength and typically they are of the same size as the latter.
  • the acoustic radiation of such an antenna then essentially depends on the diffraction and becomes very sensitive to the arrangement of objects, in particular the support of the antenna, which are located near the latter, even when they are placed behind the emission face.
  • the antenna is composed, in a known manner, of elementary sources of very small dimensions compared to the wavelength, for example 1/4 of this wavelength, which induces acoustic couplings between the acoustic projectors and strongly influences the total directivity pattern of the antenna.
  • the directivity template of a sonar antenna must often be of complex shape. For example, we often need to emit a very open front lobe, for example 120 °, while obtaining a very weak rear parasitic lobe.
  • the radiation pattern of a small acoustic base in front of the wavelength is in principle omnidirectional.
  • this diagram depends essentially on the environment and the parts located near the base, which are likely to disturb the propagation of sound waves.
  • Knowledge of the boundary conditions imposed by these parts, in particular by the load-bearing structures of acoustic projectors, is therefore very important for controlling the directivity in the far field.
  • the invention proposes a low-frequency directive acoustic antenna comprising a set of acoustic transducers assembled along a front face to emit in a direction perpendicular to this front face, characterized in that the antenna further comprises two soft baffles located at the ends and behind the front face and substantially perpendicular thereto.
  • the acoustic antenna which is shown in the appended figure comprises a front face 101 on which are grouped together a set of acoustic transducers (or projectors) 102, 6 in the example shown.
  • These acoustic transducers are designed to emit low frequencies and their dimensions are calculated for a determined frequency, while being usable in a certain frequency band surrounding it. They are for example of the known type "Tonpilz".
  • the diameter of these transducers is small compared to the wavelength used and a sufficient number is used to obtain the desired acoustic power.
  • the width of the front face of the antenna is approximately of the order of 1 wavelength at the frequency used.
  • the height is relatively arbitrary since the specifications of the directivity diagram to be obtained are essentially defined in the horizontal plane. By taking as in the figure a height appreciably smaller than the width, one obtains an omnidirectional diagram in the direction of the height.
  • the structure of the antenna is arranged so that the ends of the front face fold back at an angle of 90 ° towards the rear to present two lateral faces 103 and 104.
  • These lateral faces can be constituted by the supporting structure of the acoustic projectors 102.
  • these side faces are provided with baffles known as "soft baffles" in order to control the directivity of the antenna in the horizontal plane.
  • These soft baffles cover the lateral faces over the entire height of the antenna and over a depth which is substantially equal to 1 / 5th of the wavelength.
  • the baffles are slightly offset backwards with respect to the front face of the antenna, but this arrangement, used in the example shown for mechanical construction reasons, has no critical influence on the directivity of the 'antenna.
  • two antennas are made to transmit on the right and on the left, so that the assembly is parallelepipedic and the addition of soft baffles therefore does not oblige to increase the size of the antenna.
  • baffle Any type of known baffle can be used, for example those formed by panels of naturally compliant material as described in patent application FR-A-83 00753 of the applicant, or panels comprising an air gap in equipression such as described in patent application FR-A-89 17432 in the name of the applicant.
  • a preferred solution consists in using compliant tubes of substantially flattened section, made of composite material and which resonate at frequencies of the order of the antenna transmission frequency. These tubes are fixed vertically to cover the side faces.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Aerials With Secondary Devices (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Claims (7)

  1. Akustische Richtantenne für niedere Frequenzen, die eine Gruppe von akustischen Transduktoren (102) besitzt, welche auf einer Vorderseite (101) angeordnet sind, um in einer Richtung senkrecht zu dieser Vorderseite zu senden, dadurch gekennzeichnet, daß die Antenne weiter zwei nachgiebige Schallwände (103) enthält, die an den Enden und hinter der Vorderseite liegen, und zwar im wesentlichen senkrecht zu dieser.
  2. Antenne nach Anspruch 1, dadurch gekennzeichnet, daß die Breite der Vorderseite im wesentlichen eine Wellenlänge bei der verwendeten Sendefrequenz beträgt.
  3. Antenne nach einem beliebigen der Ansprüche 1 und 2, dadurch gekennzeichnet, daß die Breite der nachgiebigen Schallwände (103) im wesentlichen 1/5 der Wellenlänge bei der verwendeten Sendefrequenz beträgt.
  4. Antenne nach einem beliebigen der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die nachgiebigen Schallwände (103) von Tafeln aus einem natürlich federnden Material gebildet werden.
  5. Antenne nach einem beliebigen der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die nachgiebigen Schallwände (103) aus einer im Druckausgleich gehaltenen Luftschicht bestehen.
  6. Antenne nach einem beliebigen der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die nachgiebigen Schallwände (103) aus schwingenden Strukturen bestehen, die im wesentlichen auf die Sendefrequenz der Antenne abgestimmt sind.
  7. Antenne nach Anspruch 6, dadurch gekennzeichnet, daß die schwingenden Strukturen aus federnden Rohren gebildet werden.
EP19920400754 1991-03-29 1992-03-20 Richtantenne für akustische Niederfrequenzwellen Expired - Lifetime EP0506529B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9103853 1991-03-29
FR9103853A FR2674717B1 (fr) 1991-03-29 1991-03-29 Antenne acoustique basse frequence directive.

Publications (2)

Publication Number Publication Date
EP0506529A1 EP0506529A1 (de) 1992-09-30
EP0506529B1 true EP0506529B1 (de) 1995-02-15

Family

ID=9411280

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920400754 Expired - Lifetime EP0506529B1 (de) 1991-03-29 1992-03-20 Richtantenne für akustische Niederfrequenzwellen

Country Status (3)

Country Link
EP (1) EP0506529B1 (de)
DE (1) DE69201388T2 (de)
FR (1) FR2674717B1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2725867A1 (fr) * 1994-10-13 1996-04-19 France Etat Source autonome acoustique pour la tomographie des oceans
FR2731130B1 (fr) * 1995-02-23 1997-04-11 France Etat Procede et transducteurs pour emettre des ondes acoustiques dans un liquide avec une directivite marquee aux basses frequences
FR3087542B1 (fr) * 2018-10-22 2021-01-15 Thales Sa Antenne d'emission acoustique

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1649113A (en) * 1924-01-09 1927-11-15 Harvey C Hayes Submarine sound transmitter
US4140992A (en) * 1977-08-17 1979-02-20 The United States Of America As Represented By The Secretary Of The Navy Baffled blanket acoustic array
FR2539541B1 (fr) * 1983-01-19 1986-09-19 Thomson Csf Dispositif a interface reflectrice d'ondes acoustiques

Also Published As

Publication number Publication date
DE69201388T2 (de) 1995-06-14
FR2674717A1 (fr) 1992-10-02
DE69201388D1 (de) 1995-03-23
FR2674717B1 (fr) 1993-05-14
EP0506529A1 (de) 1992-09-30

Similar Documents

Publication Publication Date Title
EP0769988B1 (de) Akustischer breitbandwandler für mehrere frequenzen
CA2682273C (fr) Antenne a resonateur equipe d'un revetement filtrant et systeme incorporant cette antenne
EP1568104B1 (de) Mehrfachstrahlantenne mit photonischem bandlückenmaterial
EP0070494A1 (de) Unterseeische Sonareinrichtung
FR2994519A1 (fr) Enceinte bass-reflex a event echancre
FR2571898A1 (fr) Structure de reflecteur a grille double et son procede de montage
EP0800656A1 (de) Verfahren zum erzeugen von akustischen wellen für sonar
EP1373933A1 (de) Geschlepptes niederfrequenz-unterwasserdetektionssystem
EP0944035B1 (de) Verfahren und Anordnung zur Fokussierung akustischer Welle
EP1554777B1 (de) Mehrfachstrahlantenne mit photonischem bandlückenmaterial
EP2010937A1 (de) Verfahren zum optimieren der stromversorgung für eine linear sendende antenne, die so gezogen wird, dass sie im omnidirektionalen modus sendet
EP0733408A1 (de) Ultraschallsensor und Messverfahren unter Verwendung eines derartigen Sensors
CA2814281A1 (fr) Cornet d'antenne a grille corruguee
EP0506529A1 (de) Richtantenne für akustische Niederfrequenzwellen
FR3026569A1 (fr) Antenne omnidirectionnelle
WO2008037887A2 (fr) Antenne a materiau bip (bande interdite photonique) systeme
EP1523062A1 (de) Rundstrahlende Antenne zum Senden und Empfangen von Audio/Video Signalen
FR2613140A1 (fr) Antenne cornet parallelepipedique a repartition du champ d'ouverture linearisee en deux polarisations
EP1407292A1 (de) Bilderzeugungs- sonar und detektionssytem mit verwendung eines solchen sonars
FR2590081A1 (fr) Antenne a reflecteurs a grilles polarisees lineairement avec de meilleures performances de polarisation transversale
EP0264320B1 (de) Auslegbare zylindrische Sonaranordnung
EP0619025B1 (de) Lineare akustische antenne
FR2754109A1 (fr) Antenne a haute frequence
FR3087543A1 (fr) Procede d'utilisation d'un sonar actif a large bande spectrale d'emission et systeme sonar
EP3028064B1 (de) Sonarsystem mit einer gekrümmten antenne oder einer für die übertragung desselben übertragungsmusters wie die gekrümmte antenne konfigurierten antenne

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE GB IT

17P Request for examination filed

Effective date: 19930305

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: THOMSON-CSF

17Q First examination report despatched

Effective date: 19940722

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE GB IT

ITF It: translation for a ep patent filed
REF Corresponds to:

Ref document number: 69201388

Country of ref document: DE

Date of ref document: 19950323

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19950404

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19960219

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19960221

Year of fee payment: 5

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19970320

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19970320

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19971202

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050320