한 번 꾹 눌렀다가 몇 초 있다가 뗀 거. beam 형태로 된 거 사용.
1kHz sampling 했음
The piezoelectric effect is a reversible process in that materials exhibiting the direct piezoelectric effect (the internal generation of electrical charge resulting from an applied mechanical force) also exhibit the reverse piezoelectric effect (the internal generation of a mechanical strain resulting from an applied electrical field).
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The nature of the piezoelectric effect is closely related to the occurrence of electric dipole moments in solids.
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