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从初露头角到大显身手在第一次世界大战中,德国首先发明了潜水艇,并立即把它做为武器投入战争。这使美、法等国的舰船,受到了很大的威胁。但是在潜水艇出现后不久,法国就制成了一种可以侦察潜水艇方向和位置的仪器,使军舰有了观测水下目标的耳目,可以做好准备,予以歼击。这种仪器叫做超声定位仪。这是人类第一次应用超声来为自己服务。到现在,虽然只有短短的半个世纪,超声已被广泛地应用到现代技术的各个领域,超声技术已经成为广泛引起注意的尖端科学。有人把它说成是现代技术中的多面手了。超声和我们能够听到的声音并没有本质上的不同。我们
In the first world war, Germany first invented the submarine, and immediately put it into the war as a weapon. This has brought great threats to the ships in the United States, France and other countries. Shortly after the emergence of the submarine, however, France had produced an instrument that could detect the direction and position of the submarine, allowing the warship to read and hear the underwater target and be prepared to destroy it. This instrument is called ultrasound locator. This is the first human application of ultrasound to serve themselves. Up to now, although ultrasound has been widely used in all fields of modern technology in only half a century, ultrasound technology has become a cutting-edge science that attracts a great deal of attention. Some people describe it as a master of modern technology. Ultrasound and we can hear the sound and there is no essential difference. we