| 摘要 |
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.
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