An acoustic reflector

A technology of acoustic reflectors and reflectors, which is applied in the direction of sound-emitting devices and instruments, and can solve problems such as dependence on spherical reflectors, environmental hazards, and limitations

Inactive Publication Date: 2008-01-09
THE SEC OF STATE FOR DEFENCE IN HER BRITANNIC MAJESTYS GOVERNMENT OF THE UK OF GREAT BRITAIN & NORTHERN IRELAND
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Problems solved by technology

However, the known reflectors described above are not suitable for such use
As noted above, liquid-filled spherical reflectors rely on toxic materials and are therefore considered potentially hazardous to

Method used

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  • An acoustic reflector

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Embodiment Construction

[0019] Referring to FIG. 1 , an acoustic reflector 10 includes a spherical housing 12 having a wall 14 . This wall 14 surrounds a core 16 .

[0020] Housing 12 is made of a rigid material such as glass reinforced plastic (GRP) material or steel. The core 16 is made of a solid material such as elastomer. The frequency or range of frequencies for which the acoustic reflector is suitable depends on the predetermined combination of materials forming the shell and core and the relative dimensions of the shell and core.

[0021] However, other combinations of materials may be used, as known to those skilled in the art, so long as the relative dimensions of the shell and core are determined according to the acoustic wave propagation properties of the materials used.

[0022] Incident sound waves 18 emitted from a sound source (not shown) impinge on the housing 12 . At larger angles of incidence, most of the sound waves 18 are transmitted through the wall 14 of the housing into the...

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Abstract

An acoustic reflector (10) suitable for use as a reflective target for navigational aids and for location and re-location applications. The acoustic reflector comprises a shell (12) arranged to surround a solid core (16) . The shell is adapted to transmit acoustic waves (18) incident thereon into the core (16) . Within the core the acoustic waves are focused before being reflected from an opposing side of the shell (20) to provide a reflected acoustic wave. A portion of the acoustic waves incident on the shell is coupled into the shell wall and guided within and around the circumference thereof (26) before being re-radiated and combining constructively with the reflected acoustic wave to provide an enhanced reflected acoustic wave.

Description

technical field [0001] The present invention relates to an acoustic reflector, and more particularly to an underwater reflective target for use as a navigation aid and for positioning and relocating. Background technique [0002] Underwater reflective targets are typically acoustic reflectors, which are commonly used in sonar systems, eg for marking underwater structures. Relocating devices are used, for example, to identify pipes, cables and mines, and in the fishing industry to acoustically mark fishing nets. [0003] To be effective, acoustic reflectors need to be easily distinguishable from background features and surrounding clutter, thus requiring reflective targets that (a) produce Relatively strong reflected acoustic output response (ie, high target strength); (b) have acoustic properties that allow it to be distinguished from other (false) targets. [0004] Enhanced reflection of sound waves is currently achieved by refracting an input sound wave incident on one s...

Claims

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Application Information

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IPC IPC(8): G10K11/28G10K11/20
CPCG10K11/205
Inventor 约翰·达恩·史密斯大卫·埃默里邓肯·保罗·威廉姆斯
Owner THE SEC OF STATE FOR DEFENCE IN HER BRITANNIC MAJESTYS GOVERNMENT OF THE UK OF GREAT BRITAIN & NORTHERN IRELAND
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