The time needed to complete polarization, called ground image time, is often expressed as r, which is the physical quantity that determines the speed of polarization establishment. First, the polarization relaxation law of homogeneous medium in electrostatic field is considered. After a certain period of time in the electrostatic field, when the polarization of the medium is established, the stable value of the polarization intensity is expressed as Ps.
In the process of polarization establishment, the instantaneous value of polarization intensity is expressed in P. The law of polarization relaxation can be written as the following equation When = 0, P = 0, then the integral formula can be obtained.
The relaxation law of wood polarization in alternating electric field is now studied. From the wood microwave drying equipment, it is known that the total polarization intensity of wood is composed of four parts (the right and middle of the seven equations are the time of electron polarization, ion polarization, orientation polarization and interface polarization, respectively). Generally speaking, the polarization intensity is a function of time. In the microwave field or high frequency field, the displacement polarization (electron polarization and ion polarization) can be instantaneously completed and the stable P corresponding to the alternating field strength E can be obtained.
The relaxation law of wood polarization in alternating electric field is now studied. From the wood microwave drying equipment, it is known that the total polarization intensity of wood is composed of four parts (the right and middle of the seven equations are the time of electron polarization, ion polarization, orientation polarization and interface polarization, respectively). Generally speaking, the polarization intensity is a function of time. In the microwave field or high frequency field, the displacement polarization (electron polarization and ion polarization) can be instantaneously completed and the stable P corresponding to the alternating field strength E can be obtained.
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