超聲波回聲測量距離: 歷史上第一次使用超聲波，是在海上用它來發(fā)現(xiàn)浮在海水中的大冰塊(冰山)。大家知道，大海船[泰坦尼克號(hào)]既是因?yàn)榕鲎驳奖蕉恋舻?。這次不幸事件促使人們開始研究一種方法，以避免重演這類的碰撞事件。發(fā)現(xiàn)冰山的方法，是建立在利用回聲現(xiàn)象的基礎(chǔ)上的,那就是聲波自障礙物反射回來的現(xiàn)象。因?yàn)槁暡ㄔ谒械膫鞑ニ俣仁侨巳私灾?，那麼，如果知道了聲音往返所費(fèi)的時(shí)間(傳到障礙物再返回原地所費(fèi)的時(shí)
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