| 释义 |
Sofar|ˈsəʊfɑː(r)|
Also SOFAR.
[See quot. 1948.]
A system in which the sound waves from an underwater explosion (either artificial or natural) are detected at a number of listening stations so that its position can be fixed; more generally, detection of deep explosions a great distance away.
1947Britannica Bk. of Year 841/2 An underwater sound system, called ‘Sofar’.., made possible the location of air and ship survivors as far as 2,000 mi. from shore. 1948Ewing & Worzel Long-Range Sound Transmission 12 A network of four listening stations is being established in the Pacific by the Navy Department, and the name SOFAR, from the words SOund Fixing And Ranging, has been assigned to the system. 1961H. H. Koelle Handbk. Astronaut. Engin. xxviii. 28 The missile must carry a Sofar bomb when a deep-water detection system is used, in order to provide a deep sound source. 1966McGraw-Hill Encycl. Sci. & Technol. XIV. 429/2 Shock waves used in Sofar propagate long distances under water, being refracted by the isothermal layers in the oceans. 1979Nature 20–27 Dec. 820/2 The deep ocean sound channel is used to obtain very long range (typically >2,000 km) acoustic transmission via totally refracted propagation paths (SOFAR propagation). |