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本文讨论了圆片形压电振子的脉冲响应电压.该电压包括一个按指数衰减的脉冲电压和一个高频衰减振荡,前者是由于振子的夹持电容向电路中电阻放电形成,后者是由于振子的压电效应产生的.当外加激励的脉宽和电路的电阻为适当值时,压电振子的高频振荡幅度只和它的机电耦合系数К有关,从而提出了一个测试压电振子的厚度模机电耦合系数К_t的新方法.该方法所需的设备简单,结果准确,通过对一些样品的测试,与传统方法测试的结果很相近.
This paper discusses the impulse response voltage of a piezo-electric resonator consisting of an exponentially decaying pulse voltage and a high-frequency decay oscillation, the former being formed by resistive discharge from the clamping capacitance of the transducer to the circuit, the latter due to Piezoelectric effect generated by the oscillator. When the external excitation pulse width and resistance of the circuit is appropriate, the high-frequency oscillation amplitude of the piezoelectric vibrator only with its electromechanical coupling coefficient К, thus proposed a test piezoelectric oscillator Thickness of the model electromechanical coupling coefficient К_t new method. The method requires simple equipment, accurate results, through the test of some samples, and the results of the traditional method of testing is very similar.