EP0214822A2 - Montage de dispositifs soniques - Google Patents

Montage de dispositifs soniques Download PDF

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Publication number
EP0214822A2
EP0214822A2 EP86306703A EP86306703A EP0214822A2 EP 0214822 A2 EP0214822 A2 EP 0214822A2 EP 86306703 A EP86306703 A EP 86306703A EP 86306703 A EP86306703 A EP 86306703A EP 0214822 A2 EP0214822 A2 EP 0214822A2
Authority
EP
European Patent Office
Prior art keywords
devices
sonic
plastics material
array
block
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Withdrawn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
EP86306703A
Other languages
German (de)
English (en)
Other versions
EP0214822A3 (fr
Inventor
Anthony Richard Cobb
Diana Margaret Hodgins
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.)
Smiths Detection Watford Ltd
Original Assignee
Graseby Dynamics 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 Graseby Dynamics Ltd filed Critical Graseby Dynamics Ltd
Publication of EP0214822A2 publication Critical patent/EP0214822A2/fr
Publication of EP0214822A3 publication Critical patent/EP0214822A3/fr
Withdrawn legal-status Critical Current

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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

Definitions

  • This invention relates to the mounting of sonic devices by which term is meant a transducer for the transmission and/or reception of sound energy.
  • An object of the present invention therefore is to provide ways of mounting and locating one sonic device, or a number of sonic devices, e.g. to form an array, without having a complex supporting construction, but at the same time providing for optimum performance of each device once mounted and located.
  • At least one sonic device is mounted and located in a block of acoustically-opaque foamed plastics materials, with the sensitive head or heads left uncovered by the plastics material.
  • the foamed plastics material used for the formation of the block may vary according to requirements, but it may specifically be BIBBITHANE ISOFOAM 510 prepared and cured in accordance with the manufacturers' instructions.
  • the foamed plastics material may have closed cells which are filled with gas generated during foaming. This feature is found to improve the mechanical decoupling of one sonic device from each other device of the array, by virtue of the gas within the foam itself, which makes the material acoustically opaque.
  • the, or each, sonic device is located within a mould, preferably by its sensitive- head, and a body of foamed plastics material is moulded around it.
  • each sonic device Whilst it is envisaged that in most cases an array of sonic devices will be located within a single block of foamed plastics material, in certain circumstances, it may be appropriate for each sonic device to be located in an individual foamed plastics block, and for such blocks then to be assembled into an array.
  • the block with its sonic device or devices is preferably mounted in a sealed casing to protect it against sea water, for example.
  • a space between a wall of the casing and the heads of the devices may be filled with an acoustic coupling material.
  • Figure 1 illustrates a typical moulding tool 10 employed with the present invention and having a base 10A, end walls 10B and 10C, and side walls 10D and 10 E , the latter having a recess 10F between them and defining a ledge 10G (see Figure 2) which forms the top of the mould.
  • a single longitudinal cavity 10H is formed within which an array of sonic devices 11 can be located, the array comprising two longitudinal rows of spaced devices.
  • the location of the sonic devices within the mould is accurately carried out firstly by locating the sensitive heads 24 of the devices in locating recesses 10J of the base 10A. Thereafter, and before the remainder of the mould 10B, C, D, E, G is assembled, appropriate wiring of the devices takes place.
  • Each sonic device is coated with an appropriate releasing agent in order that the foamed plastics material to be moulded will not stick to it, since this would affect the vibration of the device.
  • Each pair of pins 12 is connected to one of a series of horizontal bars 14 (one is shown in Figure 3), each of which, in turn, is connected to a pair of further supports 16 projecting upwardly therefrom.
  • the sonic devices are accurately located and secured wtihin the mould cavity 10H prior to a moulding operation, during which foamed plastics ' material is either poured, or injected, into the cavity via one or more injecting sprues or holes 18 formed in the ledge 10G as shown in Figure 3.
  • the choice of foam e.g. BIBBITHANE ISOFOAM 510, is such that the injection, and curing can take place at room temperature. During curing, the holes 18 may be sealed. If the foamed plastics material requires heat- curing this can- be carried out in an oven.
  • the resulting foam block 22 is shown diagrammatically in Figure 4. It provides a lightweight structure in which all of the array of sonic devices are effectively encapsulated, although, as shown in Figure 4, the element heads 24 of the array of devices are left proud of the block and uncovered by the foam.
  • the foam moulding operation is such that the foam is formed with closed cells containing gas generated during moulding.
  • the resulting closed gas-filled cavity foam is rigid enough to provide an effective mounting for the devices, and to give protection against shocks.
  • the gas-filled foam has acoustic opacity to prevent acoustic coupling between devices.
  • the end walls 10B and 10C are preferably provided with circular recesses (not shown) so that the end product has integral disc-like protuberances 20.
  • the resultant block of foamed plastics material with the array of sonic devices embedded therein is now mounted in the manner shown in Figures 5 and 6 in a casing 30 of acrylic material.
  • the casing comprises a longitudinal tube having end caps 32 of the form shown in Figure 6.
  • This space 34 is filled with an acoustic coupling medium 35, which may, for example, be a semi-liquid, petroleum jelly, lanolin, silicon oil, a melted solid, or a rubber.
  • the choice of medium depends on the intended use of the completed array. Thus, it may have a similar acoustic refractive index to that of the sea water within which it is intended to operate.
  • the end caps 32 locate the protuberances 20 of the foamed plastics material in order to provide secure location for the array within the casing 30. Between the end caps 32 and the tube of the casing suitable O-ring seals 36 are provided so that there is a sealed casing between the foam of the block 22 and the sea water in which it is to operate.
EP86306703A 1985-09-04 1986-08-29 Montage de dispositifs soniques Withdrawn EP0214822A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB08521950A GB2180120A (en) 1985-09-04 1985-09-04 Mounting transducers
GB8521950 1985-09-04

Publications (2)

Publication Number Publication Date
EP0214822A2 true EP0214822A2 (fr) 1987-03-18
EP0214822A3 EP0214822A3 (fr) 1988-08-24

Family

ID=10584699

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86306703A Withdrawn EP0214822A3 (fr) 1985-09-04 1986-08-29 Montage de dispositifs soniques

Country Status (2)

Country Link
EP (1) EP0214822A3 (fr)
GB (1) GB2180120A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1250592A1 (fr) * 2000-01-24 2002-10-23 Litton Systems, Inc. Procede de mise au point et de fabrication de module de detecteur acoustique

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016103787A1 (de) * 2016-03-03 2017-09-07 Atlas Elektronik Gmbh System für eine Sonareinrichtung sowie Unterwasserfahrzeug und Verfahren damit

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1042436B (de) * 1951-10-08 1958-10-30 Bendix Aviat Corp Sende-Empfangs-Geraet fuer Unterwasserschallzeichen
FR1452111A (fr) * 1965-06-30 1966-02-25 Westinghouse Electric Corp Transducteur de sonar
US3484741A (en) * 1968-03-27 1969-12-16 Us Navy Shock wave sensor
JPS5234763A (en) * 1975-09-12 1977-03-16 Oki Electric Ind Co Ltd Process for the fabrication of a compound type device for transmitting and re ceiving waves
GB2015296A (en) * 1978-02-22 1979-09-05 Fischer & Porter Co Ultrasonic transponder
GB1552381A (en) * 1977-04-26 1979-09-12 Graseby Instruments Ltd Encapsulation process

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT265384B (de) * 1966-06-17 1968-10-10 Akg Akustische Kino Geraete Schallempfänger mit einem oder mehreren Einzelmikrophonen
US3862377A (en) * 1973-05-29 1975-01-21 Electro Voice Floor wave microphone stand
CA1200308A (fr) * 1983-11-23 1986-02-04 Peter Fatovic Microphone directionnel

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1042436B (de) * 1951-10-08 1958-10-30 Bendix Aviat Corp Sende-Empfangs-Geraet fuer Unterwasserschallzeichen
FR1452111A (fr) * 1965-06-30 1966-02-25 Westinghouse Electric Corp Transducteur de sonar
US3484741A (en) * 1968-03-27 1969-12-16 Us Navy Shock wave sensor
JPS5234763A (en) * 1975-09-12 1977-03-16 Oki Electric Ind Co Ltd Process for the fabrication of a compound type device for transmitting and re ceiving waves
GB1552381A (en) * 1977-04-26 1979-09-12 Graseby Instruments Ltd Encapsulation process
GB2015296A (en) * 1978-02-22 1979-09-05 Fischer & Porter Co Ultrasonic transponder

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1250592A1 (fr) * 2000-01-24 2002-10-23 Litton Systems, Inc. Procede de mise au point et de fabrication de module de detecteur acoustique
EP1250592A4 (fr) * 2000-01-24 2003-03-26 Litton Systems Inc Procede de mise au point et de fabrication de module de detecteur acoustique

Also Published As

Publication number Publication date
EP0214822A3 (fr) 1988-08-24
GB2180120A (en) 1987-03-18

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Inventor name: HODGINS, DIANA MARGARET

Inventor name: COBB, ANTHONY RICHARD