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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Measurement of losses in five piezoelectric ceramics between 2 and 50 MHz
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Measurement of losses in five piezoelectric ceramics between 2 and 50 MHz

机译：测量5至2 MHz之间的五个压电陶瓷的损耗

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摘要

Approximate formulas including losses to predict the electrical impedance of a thin unloaded piezoelectric plate around antiresonant frequencies of the thickness modes have been derived. To do so, a total loss factor is defined that includes both mechanical and electrical losses. Complex electrical impedance measurements on a lead metaniobate and four PZT-type materials between 2 and 50 MHz have been performed. The total loss factors were deduced from both the peak real impedance and from the -6 dB bandwidth of the real impedance peak. Results for fundamental and harmonic thickness modes on thin plates are discussed and the five materials are compared. It is found that for these piezoceramics the total loss factor is well approximated by a linear function of frequency. Finally, a frequency-dependent loss factor is included in the KLM equivalent circuit and it is shown that the theoretical impedance curves obtained with this model are in good agreement with measurements.
机译：推导了包括损耗的近似公式，以预测薄的空载压电板在厚度模式的反谐振频率附近的电阻抗。为此，定义了一个总损耗因子，其中包括机械损耗和电气损耗。已对偏铌酸铅和4至2 MHz之间的四种PZT型材料进行了复杂的电阻抗测量。总损耗因数是从峰值实际阻抗和实际阻抗峰值的-6 dB带宽推导出来的。讨论了薄板上基本和谐波厚度模式的结果，并比较了五种材料。已经发现，对于这些压电陶瓷，总损耗因数通过频率的线性函数很好地近似。最后，在KLM等效电路中包括了一个与频率有关的损耗因子，结果表明，用该模型获得的理论阻抗曲线与测量值非常吻合。

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