超聲波的應用 超聲效應已廣泛用于實際，主要有如下幾方面： ①超聲檢驗。超聲波的波長比一般聲波要短，具有較好的方向性，而且能透過不透明物質，這一特性已被廣泛用于超聲波探傷、測厚、測距、遙控和超聲成像技術。超聲成像是利用超聲波呈現(xiàn)不透明物內部形象的技術 。把從換能器發(fā)出的超聲波經聲透鏡聚焦在不透明試樣上，從試樣透出的超聲波攜帶了被照部位的信息（如對聲波的反射、吸收和散射的能力），經聲透鏡匯聚在壓電接收
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