The working principle of the electroacoustic transducer of the piezoelectric microphone is shown in the figure. The crystal deformation causes the voltage to be proportional to the deformation ratio. Therefore, to obtain the sensitivity and frequency independent of the sound-transmitting nitrogen plus the constant external force, the crystal must be shifted regardless of the frequency. In order to improve the sensitive bottom of the microphone, the crystal with the strongest piezoelectric effect should be selected. Rothel Salt and Dihydrogen Phosphate (ADP) are suitable for use in audio microphones. It is suitable for underwater acoustic and ultrasonic piezoelectric microphones, although it has low sensitivity but is not easy to damage due to its low sensitivity and low hardness. The piezoelectric polymers that were applied in the early 1970s were used for both RJs for acoustic microphones and for underwater acoustic and ultrasonic piezoelectric microphones.
A piezoelectric microphone made of a piezoelectric south polymer film has various structures, and the structure of the ring-shaped supporting diaphragm is as shown. The microphone has a diameter of 30 mm and the support plate has a radius of curvature of 35 mm. In order to allow the diaphragm to vibrate in both directions, some peaks with an elevation of 0.5 mm are raised on the support plate. The holes in the support plate communicate the air on both sides, thereby reducing the restoring force on the diaphragm and increasing the sensitivity of the microphone. The preamplifier is mounted in the cavity membrane.
All the piezoelectric polymer film made of the microphone, the diaphragm between the support points is curved. When deformed, the needle has the largest stress in the outer diameter direction and the largest strain. Therefore, the surface of the deformation diaphragm is not tapered but is tent-shaped. Uneven stresses also cause some radial curvature in the system diaphragm, as shown in Figure 9-9. These curvatures contribute to the linear operation of the system because the flat diaphragm produces more than two harmonics.
The preamplifier is directly loaded into the membrane of the support plate. A preamplifier with a field effect transistor has an input impedance of 200 MΩ.
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