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5. Piezoelectric microphone
5.1 Principle of piezoelectric coupling
Certain materials have the property of generating surface electrical charges when subjected to pressure or stress. These materials are known as piezoelectric. The density and zone of appearance of the charges depend on the force exerted, the nature of the material and the direction of the cutting planes in relation to a principal axis called the polarization axis.
The piezoelectric effect is a reciprocal effect: piezoelectric...
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