Factors to affect the sensitivity of piezoelectric ceramics (二)

Factors to affect the sensitivity of piezoelectric ceramics (二)

Elastic flexibility factors of the mechanical system is made up from the piezoelectric ceramic sheet and holder, Its size is mainly related to its material properties. Therefore,when you choose the high voltage constant of piezoelectric ceramic , which should take into account the size of its elasticity softening factor. The amplification factor of the measuring line is related to the offset and series of the amplifier. In the case of reasonable bias, increasing the series can greatly improve the amplification factor. But also consider the amplifier noise and linearity.

Dynamic analysis means the input of piezo disc crystal sensor may be a fast continuous signal in the practical work. it may be a pulse signal, or periodic input. At this point the output characteristics of the transducer is no longer steady state, but coming the transient transition characteristics, that is, the relationship between the output and the input will be a time-varying function. The dynamic characteristics of the sensor are usually analyzed by using amplitude-frequency characteristics. According to the dynamic analysis, the sensitivity of the piezoelectric sensor should be combined with the frequency of external force to consider. In the flat range of amplitude-frequency characteristics, the sensitivity of the piezo ceramic ring can be improved by increasing the quality of the mechanical system, by increasing the piezoelectric constant of the piezoelectric ceramic datasheet, and reducing the stiffness coefficient of the mechanical system and measuring the feedback capacitance of the line. In the dynamic, the sensitivity of the piezo cylinder generator can be improved by reducing the natural frequency of the mechanical system, increasing the crystal piezo ring constant of the piezoelectric ceramic sheet and reducing the feedback capacitance of the measuring line.