超聲波傳感器的結構及工作原理： 超聲波傳感器是利用超聲波的特性研制而成的傳感器。超聲波是一種振動頻 率高于聲波的機械波，由換能晶片在電壓的激勵下發生振動產生的，它具有頻率高、波長短、繞射現象小，特別是方向性好、能夠 成為射線而定向傳播等特點。超聲波對液體、固體的穿透本領很大，尤其是在陽光不透明的固體中，它可穿透幾十米的深度。超聲波碰到雜質或分界面會產生顯著反 射形成反射成回波
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