GB2079097A - An acoustic transducer - Google Patents

An acoustic transducer Download PDF

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Publication number
GB2079097A
GB2079097A GB8019609A GB8019609A GB2079097A GB 2079097 A GB2079097 A GB 2079097A GB 8019609 A GB8019609 A GB 8019609A GB 8019609 A GB8019609 A GB 8019609A GB 2079097 A GB2079097 A GB 2079097A
Authority
GB
United Kingdom
Prior art keywords
shield
base
copper
acoustic transducer
acoustic
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Withdrawn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
GB8019609A
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.)
WILSON WALTON INT Ltd
Original Assignee
WILSON WALTON INT 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 WILSON WALTON INT Ltd filed Critical WILSON WALTON INT Ltd
Priority to GB8019609A priority Critical patent/GB2079097A/en
Publication of GB2079097A publication Critical patent/GB2079097A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/44—Special adaptations for subaqueous use, e.g. for hydrophone
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
    • G01S1/72—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using ultrasonic, sonic or infrasonic waves
    • 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

Abstract

An acoustic transducer, particularly for subsea use, has a transducing element 2 supported on a base 1. A seal 3 encapsulates the element 2 and is fixed on the base 1. A shield 4 of marine fouling deterrent alloy is provided at the exterior surface of the seal 3. <IMAGE>

Description

SPECIFICATION An acoustic transducer The present invention relates to an acoustic transducer.
Where acoustic transducers are used in the sea, for instance in an acoustic data telementry system to monitor the potential of an electrolytically protected pipeline, they are liable to fouling.
An acoustic transducer according to the invention comprises a base, a transducing element supported on the base, a seal encapsulating the element and fixed on the base and a shield of marine fouling deterrent alloy provided at the exterior surface of the seal.
Preferably the shield is of copper or a copper alloy which is effective in deterring fouling since marine organism do not adhere to copper. A copper nickel alloy may be used as may other metals or alloys which deter marine fouling. The shield may be in the form of a continuous sheet metal enclosure. Alternatively, the shield may be discontinuous in the form of a perforate tube, a mesh or wire hoops or spirals. Normally the seal will be a block of resin. A Discontinuous shield can be embedded in the seal provided that it is exposed at the surface. In all cases the shield will be electrically isolated from other metallic components of the arrangement.
To help understanding of the invention, a specific embodiment thereof will now be described by way of example and with reference to the accompanying drawing which shows a sideview, partially in section, of a transducer.
The transducer has a base on which a spherical transducing element 2 is supported.
The element is encapsulated in a sealing block 3 of epoxy resin which is fixed onto the base.
A copper shield 4, comprised of a tube 5 typically 50 mm in diameter and a welded-on end plate 6, surrounds the outer surface of the resin block. It is desirable for the copper to be thin in order to provide an acoustic imedance giving good matching of the transducing element and epoxy resin block to the surrounding water. The acoustic impedance is improved where the shield is discontinuous.
1. An acoustic transducer comprises a base, a transducing element supported on the base, a seal encapsulating the element and fixed on the base and a shield of marine fouling deterrent alloy provided at the exterior surface of the seal.
2. An acoustic transducer as claimed in claim 1 wherein the shield is of copper or copper alloy.
3. An acoustic transducer as claimed in claim 1 or claim 2 wherein the shield is a continuous sheet metal enclosure.
4. An acoustic transducer as claimed in claim 1 or claim 2 wherein the shield is discontinuous.
5. An acoustic transducer substantially as hereinbefore described with reference to the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (5)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION An acoustic transducer The present invention relates to an acoustic transducer. Where acoustic transducers are used in the sea, for instance in an acoustic data telementry system to monitor the potential of an electrolytically protected pipeline, they are liable to fouling. An acoustic transducer according to the invention comprises a base, a transducing element supported on the base, a seal encapsulating the element and fixed on the base and a shield of marine fouling deterrent alloy provided at the exterior surface of the seal. Preferably the shield is of copper or a copper alloy which is effective in deterring fouling since marine organism do not adhere to copper. A copper nickel alloy may be used as may other metals or alloys which deter marine fouling. The shield may be in the form of a continuous sheet metal enclosure. Alternatively, the shield may be discontinuous in the form of a perforate tube, a mesh or wire hoops or spirals. Normally the seal will be a block of resin. A Discontinuous shield can be embedded in the seal provided that it is exposed at the surface. In all cases the shield will be electrically isolated from other metallic components of the arrangement. To help understanding of the invention, a specific embodiment thereof will now be described by way of example and with reference to the accompanying drawing which shows a sideview, partially in section, of a transducer. The transducer has a base on which a spherical transducing element 2 is supported. The element is encapsulated in a sealing block 3 of epoxy resin which is fixed onto the base. A copper shield 4, comprised of a tube 5 typically 50 mm in diameter and a welded-on end plate 6, surrounds the outer surface of the resin block. It is desirable for the copper to be thin in order to provide an acoustic imedance giving good matching of the transducing element and epoxy resin block to the surrounding water. The acoustic impedance is improved where the shield is discontinuous. CLAIMS
1. An acoustic transducer comprises a base, a transducing element supported on the base, a seal encapsulating the element and fixed on the base and a shield of marine fouling deterrent alloy provided at the exterior surface of the seal.
2. An acoustic transducer as claimed in claim 1 wherein the shield is of copper or copper alloy.
3. An acoustic transducer as claimed in claim 1 or claim 2 wherein the shield is a continuous sheet metal enclosure.
4. An acoustic transducer as claimed in claim 1 or claim 2 wherein the shield is discontinuous.
5. An acoustic transducer substantially as hereinbefore described with reference to the accompanying drawings.
GB8019609A 1980-06-16 1980-06-16 An acoustic transducer Withdrawn GB2079097A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8019609A GB2079097A (en) 1980-06-16 1980-06-16 An acoustic transducer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8019609A GB2079097A (en) 1980-06-16 1980-06-16 An acoustic transducer

Publications (1)

Publication Number Publication Date
GB2079097A true GB2079097A (en) 1982-01-13

Family

ID=10514064

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8019609A Withdrawn GB2079097A (en) 1980-06-16 1980-06-16 An acoustic transducer

Country Status (1)

Country Link
GB (1) GB2079097A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9754578B2 (en) 2014-01-09 2017-09-05 Dolby Laboratories Licensing Corporation Loudspeaker horn and cabinet

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9754578B2 (en) 2014-01-09 2017-09-05 Dolby Laboratories Licensing Corporation Loudspeaker horn and cabinet

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)