...As a result, sound waves of several hundred Hz can be tracked up to several thousand kilometers, and by receiving the sound waves at several points, the position of a sound source at a considerable distance can be measured. This technique is called sofar (sound fixing and ranging) and was used by the US military for rescue operations during World War II. Sofar buoys emit 200 Hz sound waves and are tracked by three or more moored receiving stations, and are used to measure mid-ocean currents over a range of 1,000 km. ... *Some terminology that refers to "sound fixing and ranging" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…このため数百Hzの音波を数千kmまで追跡でき,音波を数地点で受信することで,かなり距離の離れた音源の位置を測定できる。この技術をソーファーsofar (sound fixing and ranging)といい,第2次大戦中にアメリカ軍によって救難のために使用された。ソーファーブイは,200Hzの音波を発信しながら漂流するブイを係留した3点以上の受信局で追跡するもので,1000kmの範囲の中層の海流測定に用いられる。… ※「sound fixing and ranging」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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