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Applied Physics 2024
基于LabVIEW的压电陶瓷强场机械品质因数测量系统
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Abstract:
压电材料在强场和弱场条件下的机械品质因数Qm存在较大差别，而目前国际上尚没有通用和成熟的压电材料强场Qm表征方法和测量系统。本文设计了一套基于LabVIEW的压电振子强场机械品质因数测量系统并提出一种新的数据处理方法，实现了仪器控制、波形数据读取、信号滤波和拟合，以及Qm值自动计算功能。用该系统测量了圆环和长条压电振子的Qm值随电压和振动速度变化关系，结果表明随着驱动电场和振动速度的增大，样品的机械品质因数急剧减小。该测量系统运行稳定，可实现仪器控制和数据采集的自动化处理，可以满足压电陶瓷强场机械品质因数测量的需要，能极大地提高测试效率。
There is a significant difference in the mechanical quality factor Qm of piezoelectric materials under high- and low-field conditions, however, currently there is no universal characterization method and testing system for high-field Qm of piezoelectric materials. In this paper, a LabVIEW- based measurement system for the high-field mechanical quality factor (Qm) of piezoelectric ceramic resonators is designed, and a new method of data processing is proposed to realize the functions of instrument control, waveform data acquisition, signal filtering and fitting, and Qm calculation. The system is applied to determine the electric field and vibration velocity dependences of Qm values for thin disk and rectangular piezoelectric ceramic resonators. The results demonstrate a significant decrease of Qm with increasing electric field and vibration velocity. The system provides automated instrument control and data acquisition processing, which meets the needs of high-field mechanical quality factor measurement of piezoelectric ceramics and greatly enhances testing efficiency.
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