| 摘要 |
<p>A sonobuoy includes a float portion 1 and a hydrophone supporting structure 2 which, when deployed, separate, being connected by a line 21 which provides a signal transmission path between hydrophones and a r.f. transmitter 4 and aerial 7. When separated, the float portion 1 moves upwardly to the surface of the water and the supporting structure 2 moves downwardly, during which time the hydrophones detect acoustic vibrations. Signals representative of the acoustic energy are transmitted via the aerial 7. When line 21 has been paid out to its full extent from the drum 20 on which it is wound, the line 21 breaks and the sonobuoy ceases transmission. As the sonobuoy is intended to operate whilst the hydrophones are moving downwardly, the float portion 1 and cable 21 need not be capable of supporting the weight of the hydrophone support structure 2 and hence occupy a smaller volume and need not be so robust as in a conventional apparatus. <IMAGE></p> |
