EP0251599A2 - Akustischer Wandler - Google Patents

Akustischer Wandler Download PDF

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Publication number
EP0251599A2
EP0251599A2 EP87305474A EP87305474A EP0251599A2 EP 0251599 A2 EP0251599 A2 EP 0251599A2 EP 87305474 A EP87305474 A EP 87305474A EP 87305474 A EP87305474 A EP 87305474A EP 0251599 A2 EP0251599 A2 EP 0251599A2
Authority
EP
European Patent Office
Prior art keywords
transducer
acoustic
piezoelectric
piezoelectric material
acoustic transducer
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Withdrawn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
EP87305474A
Other languages
English (en)
French (fr)
Other versions
EP0251599A3 (de
Inventor
David Graham Flavell
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.)
BAE Systems Electronics Ltd
Original Assignee
Plessey Overseas Ltd
GEC Marconi Ltd
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 Plessey Overseas Ltd, GEC Marconi Ltd filed Critical Plessey Overseas Ltd
Publication of EP0251599A2 publication Critical patent/EP0251599A2/de
Publication of EP0251599A3 publication Critical patent/EP0251599A3/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Withdrawn legal-status Critical Current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
    • B06B1/0688—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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers

Definitions

  • This invention relates to an acoustic transducer. It relates particularly to a transducer body capable of being used in a passive sonar system.
  • transducer body for a passive sonar system there is a requirement to provide a useful transducer surface having a comparatively large area, for example an area of fifteen centimetres square.
  • the required thickness of this body is expected to be quite small, for example 0.025m.
  • cost of the final transducer body One way in which the cost might be reduced would be to reduce the area of active material used in each transducer. However, to reduce the area of active material can frequently produce unwelcome side effects in that the overall perfomance of the transducer is degraded.
  • an acoustic transducer comprising a piezoelectric material having a linear shape and which is arranged in the form of a flat spiral within a body of encapsulant material.
  • the piezoelectric material is a polyvinylidene fluoride plastics material in the form of a coaxial cable, a piezoelectric rubber composition or an optical fibre.
  • the spiral shape may have a pitch which is varied at different positions around the circumference of the spiral so that the sensitivity of the resulting transducer will be varied in its response to signals coming from different directions.
  • the choice of encapsulant material used to form the transducer body can also be varied as necessary to produce a required acoustic sensitivity in the finished transducer.
  • the invention also comprises a large area planar hydrophone having an array of acoustic transducers as just described.
  • the acoustic transducer l comprises a length of a piezoelectric material 4 which is arranged in the form of a flat spiral shape.
  • the piezoelectric material 4 was a polyvinylidene fluoride coaxial cable.
  • the spiral shape is supported in a body 2 of encapsulant material.
  • the dimensions of the body 2 were 0.025 metres thick by fifteen centimetres square.
  • the terminal 3 allows the transducer l to be readily connected to the other components of a passive sonar system so that the transducer output can be utilized.
  • the transducer l In operation, when the acoustic transducer l is mounted on the hull surface of a marine vessel and connected in a passive sonar system, the transducer will be able to pick up sounds and pressure variations from the environment for processing in the system.
  • a number of the transducers l may be mounted side-by-side like tiles on a wall to provide a large area hydrophone which will have a high sensitivity to the incoming signals.
  • a transducer may be constructed in which during the winding of the spiral shape the pitch of the spiral is varied at particular positions round the circumference. This then will act to vary the sensitivity of the resulting transducer across its face so that, after encapsulation, the same variation will be apparent in the completed transducer body. This provision can have a beneficial effect on the beamforming performance of large arrays.
  • the sensitivity of a hydrophone is additionally dependent on the physical properties of the encapsulation material.
  • the careful choice of encapsulation material therefore can give one a further control over the acoustic sensitivity of the resulting hydrophone.
  • the acoustic transducer of the invention was found to enable the construction of a high performance large area planar hydrophone at a comparatively low cost.
  • the transducer was also able to be easily tailored to produce specific performance characteristics.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Mechanical Engineering (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
EP87305474A 1986-06-19 1987-06-19 Akustischer Wandler Withdrawn EP0251599A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8614940A GB2191909B (en) 1986-06-19 1986-06-19 Acoustic transducer
GB8614940 1986-06-19

Publications (2)

Publication Number Publication Date
EP0251599A2 true EP0251599A2 (de) 1988-01-07
EP0251599A3 EP0251599A3 (de) 1989-04-26

Family

ID=10599709

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87305474A Withdrawn EP0251599A3 (de) 1986-06-19 1987-06-19 Akustischer Wandler

Country Status (2)

Country Link
EP (1) EP0251599A3 (de)
GB (1) GB2191909B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998034434A1 (fr) * 1997-02-04 1998-08-06 Jingjiang Bi Ressort piezo-electrique
CN109005491A (zh) * 2018-07-03 2018-12-14 惠州学院 黄金螺旋结构的旅游环境噪声测量的mems矩阵麦克风

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2256111B (en) * 1991-04-11 1995-02-01 Univ Southampton Distributed sensors for active vibration control
CN114563030A (zh) 2009-05-27 2022-05-31 希里克萨有限公司 光学感测的方法及装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB701962A (en) * 1947-12-26 1954-01-06 Zenith Radio Corp Improvements in piezo-electric transducers
FR2119482A5 (de) * 1970-12-21 1972-08-04 Ki
JPS60264200A (ja) * 1984-06-13 1985-12-27 Shimada Phys & Chem Ind Co Ltd 超音波振動子
EP0174897A2 (de) * 1984-09-12 1986-03-19 NGK Spark Plug Co. Ltd. Piezoelektrische Unterwasseranordnung

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3240916C2 (de) * 1982-11-05 1985-10-31 Luther, Erich, Ing.(Grad.), 3003 Ronnenberg Vorrichtung zum Prüfen von elektrischen Leiterplatten

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB701962A (en) * 1947-12-26 1954-01-06 Zenith Radio Corp Improvements in piezo-electric transducers
FR2119482A5 (de) * 1970-12-21 1972-08-04 Ki
JPS60264200A (ja) * 1984-06-13 1985-12-27 Shimada Phys & Chem Ind Co Ltd 超音波振動子
EP0174897A2 (de) * 1984-09-12 1986-03-19 NGK Spark Plug Co. Ltd. Piezoelektrische Unterwasseranordnung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 10, no. 137 (E-405)[2194], 21st May 1986; & JP-A-60 264 200 (SHIMADA RIKA KOGYO K.K.) 27-12-1985 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998034434A1 (fr) * 1997-02-04 1998-08-06 Jingjiang Bi Ressort piezo-electrique
CN109005491A (zh) * 2018-07-03 2018-12-14 惠州学院 黄金螺旋结构的旅游环境噪声测量的mems矩阵麦克风
CN109005491B (zh) * 2018-07-03 2023-06-13 惠州学院 黄金螺旋结构的旅游环境噪声测量的mems矩阵麦克风

Also Published As

Publication number Publication date
GB2191909B (en) 1989-12-20
GB2191909A (en) 1987-12-23
EP0251599A3 (de) 1989-04-26
GB8614940D0 (en) 1986-10-29

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Inventor name: FLAVELL, DAVID GRAHAM