Views: 7 Author: Site Editor Publish Time: 2019-07-24 Origin: Site
For piezoelectric ceramics, to make it useful, there must be a piezoelectric effect. Otherwise, it is no different from ordinary ceramics. As for piezoelectric ceramics, ferroelectric materials are used because piezoelectric ceramic sensors have piezoelectric effects only after artificial polarization. Therefore, it is required that the direction of the electric dipole moment inside the material can be turned under the action of an external electric field. Therefore, it is necessary to use ferroelectric materials.
The piezoelectric ceramic transducer has the principle that when the polarized piezoelectric ceramic is excited by a periodic signal, a stretching vibration is generated. In turn, pushing the surrounding media to exercise. In addition, under the push of the medium, a stretching vibration is generated to generate an electrical signal. Therefore, the transducer is formed from it.
The piezoelectric effect in piezoelectric disc transducer is also divided into lateral and longitudinal directions. Therefore, if viewed from the definition of them, there is a certain difference between them,they are transverse piezoelectric effect: it refers to the use of electric charge generated along the Y-axis direction of the mechanical axis to generate a piezoelectric effect. Longitudinal piezoelectric effect: It refers to the use of electric charge generated along the X-axis direction of the electric axis to generate a piezoelectric effect. These two piezoelectric effects are different in terms of force direction and the like. Therefore, we must have a clear understanding, and we must not confuse them so as to avoid problems or misconceptions, thus causing unnecessary problems or troubles.
Piezoelectric ceramics, which belong to piezoelectric materials, should be subordinate to each other. which are generally classified into two types, piezoelectric crystals and piezoelectric ceramics. Among them, a piezoelectric crystal generally refers to a piezoelectric single crystal, and a piezoelectric ceramic refers to a piezoelectric polycrystal. Therefore, there is a clear difference between them.
Piezoelectric ceramics also have their own natural frequencies. Also, if the driving frequency of piezo disks crystal is closer to the natural frequency, the amplitude of the piezoelectric ceramic is larger. However, since its frequency is relatively easy to control, it basically does not cause too much problems. Moreover, it is also used in the circuit.
The main reason for this conclusion is that this kind of piezoelectric ceramic is inevitable in its characteristics, has a hysteresis curve, and can be approximated as a rubber property, and is an inherent feature. Moreover, to some extent, it also reflects the loss of energy. Therefore, this conclusion will be reached.
