Piezoelectric Microphone
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Piezoelectric microphones contain ceramic or quartz crystals linked with a diaphragm or directly exposed to acoustic waves. Stresses in the crystals, resulting from a sound field, generate an output proportional to the acoustic pressure. Many designs incorporate a built-in preamplifier next to the crystal. This arrangement reduces the electrical noise and output impedance.
Piezoelectric microphone. AP = acoustic pressure, Uo = output voltage, 1 = diaphragm, 2 = ceramic or quartz crystals, 3 = built-in preamplifier, 4 = case
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