Detection system of piezoelectric material

Abstract

The invention relates to a detection system of a piezoelectric material, which comprises a power module, a digital signal processing (DSP) chip, an excitation matrix switch, a signal conditioning circuit, an analog matrix switch, a band pass filter, a signal scaling circuit, a personal computer (PC), a serial communication interface and a data table storage unit, or a central processing unit, a data acquisition and analog-digital (AD) conversion unit are utilized to replace the DSP chip to achieve the full functions of the DSP chip. The system can reflect the characteristics of the piezoelectric material by detecting the charge and discharge characteristics and resonance characteristics (LC characteristics) of excitation response in the circuit, and the characteristics of the piezoelectric material are compared with the set standard values, thereby selecting the piezoelectric material meeting the preset requirements. The system adopts the digital method and utilizes high-speed data acquisition to improve the sampling intensity of charge and discharge characteristic signals, thereby improving the success rate of selection; and the time sampling on resonant characteristic signals is carried out, the time domain is converted into the frequency domain through the discrete forurier transform (DFT), and the processing of resonant characteristic signals in the frequency domain is favorable for flexibly removing interferential components, thereby improving the stability and reliability of the system.

Description

technical field [0001] The invention belongs to the field of electronic control testing and relates to a piezoelectric material detection system. Background technique [0002] Piezoelectric material refers to a material that generates a voltage between its two ends when subjected to pressure. Piezoelectric materials are characterized by piezoelectric effect, that is, when subjected to pressure, a voltage will appear between the two ends and the amount of charge is proportional to the pressure. The mechanism of the piezoelectric effect is: the crystal with piezoelectricity has low symmetry. When it is deformed by an external force, the relative displacement of the positive and negative ions in the unit cell makes the positive and negative charge centers no longer overlap, resulting in macroscopic polarization of the crystal, while The surface charge surface density of the crystal is equal to the projection of the polarization intensity on the surface normal direction, so whe...

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Problems solved by technology

However, there is currently no testing device for piezoelectric materials on the market.

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