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piezo ceramic disc

piezo ceramic disc

By mixing the ingredients, high temperature sintering, powder solid-state reaction between the collection of no rule made of polycrystalline piezoelectric ceramic called piezoelectric. After the end of piezoelectric polarization of random orientation of the spontaneous polarization, there is no piezoelectricity. It is the spontaneous polarization exists in the high voltage direct current electric field under the domain, depending on the direction of preferred orientation of the external electric field to rearrange the withdrawal of external electric field in the ceramic body still retains some of the overall residual polarization, so that with the piezoelectric ceramic body, a piezoelectric ceramic.
piezo ceramic disc

Piezoelectric effect is reversible: if the audio imposed on the piezoelectric ceramic voltage, and can create mechanical vibrations, audible; the other hand, piezoelectric ceramics subjected to mechanical vibrations (or pressure), the chip will generate a certain amount of charge Q from the electrode output voltage signal.

Now more common germanium lead titanate piezoelectric ceramics (PZT-4/ptz-8), with zirconium, titanium, lead oxides prepared after sintering. In view of the human ear for sound frequency of about 3kHz the most sensitive, piezoelectric ceramics are usually resonant frequency f0 designed around 3kHz. Taking into account the low-frequency work, only one frequency of piezoelectric ceramics is difficult to meet the requirements - like double-membrane structure, its shape and symbols shown in Figure 1. It is the diameter d of piezoelectric ceramics with a diameter D of the composite sheet made of metal vibration. D is generally 15 ~ 40mm, the total composite film thickness vibration h.piezo ceramic disc