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超聲波在壓電材料中傳播時的基本特征

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(1) 超聲波在均勻壓電材料表面傳播，它的传播特征和在均勻非压电材料表面相似，带有无色散性，它的传播速度是依赖于材料本身，波的能量集中在表面1～2个波长范围。

(2)在压电介质中伴随着弹性表面超聲波的传播，在介质表面附近还存在一个以相同速度同向传播的电磁波。因此，使得压电介质中的弹性表面波可以和紧邻的半导体中的载流子发生相互作用，从而可实现表面波的放大、信号的存储，并利用它增强信号的非线性相互作用。

(3)介质的压电性使介质变硬，从而使超聲波的像素变大。在压电介质中，超聲波的速度不仅依赖于介质的弹性性质，而且依赖于介质的压电性质和介电特性。
(4)在壓電介質中可以單獨存在一個水平偏振的波，稱爲電聲波。這個波在非壓電介質中是不可能存在的。

从上述超聲波的传播特征可以看出利用声表面超聲波在压电材料上的传播非常有利于信号的截取和处理，以此为基础，可以制备出功能复杂、性能优异的各种超聲波换能器 /超聲波振子。

“靈科超聲波 ” 源于1993年，擁有一支高效、有底蘊的研發制造隊伍，發明創造百余項專業新技術。爲客戶供應 珠海超声波、中山超聲波焊接機、江门超聲波塑焊机 、陽江超音波設備配件等、根據廠家需求定制非標設備。

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超聲波在壓電材料中傳播時的基本特征

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