The structure of the vibrating beam piezoelectric pressure sensor is shown in Figure 13-11. The vibrating beam is its heart, in the center of the sensor. In order to avoid direct coupling between the strainer and the mechanical system that generates the force, the ends of the vibrating beam are fixed on the isolator. The isolator includes an isolator elastomer, an isolator mass, and a curved unloading zone. The function of the bellows is to convert the input pressure into the measuring force of the vibrating beam. The function of the balancing mass is to adjust the power component so that its center of gravity coincides with the pivot point. When the sensor is disturbed by external acceleration, the resonator is not interfered by external forces because of its force arm. Figures 13-12 show the structure of a crystal resonator.
When the crystal resonator is subjected to an external force, its vibration amount string changes. As shown in Fig. 13-11, the pressure acting on the corrugated tube of the bellows is formed as a force distance around the fulcrum. The resonance frequency of the crystal resonator is changed by setting nine to balance the moment with the moment generated by the force of the water. The pressure that is not added is P. Its vibration period is t, then
The equations to and t are the periods of the power cycle when the pressure is equal to zero and not zero, respectively; A is the constant determined by the sensor.
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