EP0401027A2
Expired / Lapsed
EP
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An acoustic transducer
Assignee: BAE Systems Electronics Ltd
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Filing: 1990-05-31
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Granted: —
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Expires: 2010-05-31
Abstract
Abstract In order to reduce side lobes in the transmission characteristics of an acoustic transducer the amplitude of transmission is tapered towards the edges of the aperture. This is done by constructing the transducer from ceramic-epoxy composite elements connected in a one-three configuration and distributed with varying volume fraction in the width and length directions.
Inventors
- 👤 Gordon Hayward
- 👤 Victor James Murray
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 07:50
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0607; B06B1/0622; B06B1/0629
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
114 words
An acoustic transducer comprising a layer of piezoelectric and non-piezoelectric material distributed across an aperture of the transducer, and electrode means on each side of the layer for applying an input signal to it or receiving an output signal from it; the manner of distribution of the piezoelectric and non-piezoelectric being such that the amplitude of vibration caused by given input signals (or the amplitude of an output signal caused by a given vibration) is dependent on a control function defined by (a) the percentage and/or distribution and/or type of piezoelectric material and/or (b) the percentage and/or distribution and/or type of non piezoelectric material, characterised in that the said function varies across the aperture.
Claim 2
Dependent Claim
114 words
An acoustic transducer comprising a layer of piezoelectric and non-piezoelectric material distributed across an aperture of the transducer, and electrode means on each side of the layer for applying an input signal to it or receiving an output signal from it; the manner of distribution of the piezoelectric and non-piezoelectric being such that the amplitude of vibration caused by given input signals (or the amplitude of an output signal caused by a given vibration) is dependent on a control function defined by (a) the percentage and/or distribution and/or type of piezoelectric material and/or (b) the percentage and/or distribution and/or type of non piezoelectric material, characterised in that the said function varies across the aperture.
Claim 3
Dependent Claim
26 words
A transducer according to claim 1 comprising a number of blocks of elements, the said function being uniform across each block but varying between adjacent blocks.
Claim 4
Dependent Claim
19 words
A transducer according to claim 1 or 2 comprising pillars of ceramic piezoelectric material embedded in an epoxy material.
Claim 5
Dependent Claim
33 words
A transducer according to any preceding claim comprising two electrodes making contact with the piezoelectric material across the aperture of the transduceri and a single excitation source or receiver connected to the electrodes.
References Cited (Backward Citations)
No citation records indexed.
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