Piezoelectric signal peak detection method and device

Abstract

The invention provides a piezoelectric signal peak detection method. The method includes the first step of transmitting sampling signals every a first preset sampling period, the second step of calculating the amplitudes of sampled signals, corresponding to the sampling signals, in a piezoelectric electret thin-film piezoelectric sensor, judging whether the amplitudes of the sampled signals are larger than a first preset value, and if yes, transmitting the sampling signals every a second preset sampling period, and the third step of calculating the amplitudes of two piezoelectric signals corresponding to two sampling signals at adjacent sampling instants, judging whether the difference between the amplitudes of the two piezoelectric signals is smaller than a preset difference value, and if yes, transmitting the sampling signals according to a preset time range and a third preset sampling period, calculating the peak value of a current piezoelectric signal according to the sampling signals within the preset time range and outputting the peak value. The invention further provides a piezoelectric signal peak detection device. By the adoption of the piezoelectric signal peak detection method and device, the situation that measurement of the peak value has a large error due to misjudgement of the peak value of the current piezoelectric signal is avoided, and simple and accurate detection of the peak value is achieved.

Description

technical field [0001] The invention relates to the field of piezoelectric signal detection, in particular to a piezoelectric signal peak detection method and a device thereof. Background technique [0002] When some dielectrics are deformed by external forces in a certain direction, polarization will occur inside them, and at the same time, opposite charges will appear on its two opposite surfaces. When the external force is removed, it will return to the uncharged state. This phenomenon is called the positive piezoelectric effect. When the direction of the force changes, the polarity of the charge also changes. On the contrary, when an electric field is applied in the polarization direction of the dielectric, these dielectrics will also deform. After the electric field is removed, the deformation of the dielectric will disappear. This phenomenon is called the inverse piezoelectric effect. The dielectric piezoelectric effect includes the direct piezoelectric effect and th...

AI Technical Summary

Problems solved by technology

At present, there are many types of piezoelectric sensors. Among them, there is a piezoelectric sensor made of piezoelectric electret film material. Traditionally, the peak detection process of the piezoelectric signal converted and output by it is complicated, and it is easy to be wrongly detected, so that Subsequent processing and application of the piezoelectric signal will bring large errors

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