我们介绍了一种新颖的超声波检测技术，它用宽带，非接触的电容换能器实现超声波的激发或接收。
We describe a new ultrasonic sensing technique which uses broadband and noncontact capacitive transducer to generate or receive ultrasonic waves.
结果表明，在换能器不同振动模态下，等效并联电容电阻并非恒定值，而且实际支承工况下换能器系统工作时存在负阻尼效应。
The result shows, under different vibration mode, equivalent parallel capacitance and resistance are not constant value. There is negative damp effect in transducer system at the operating mode.
理论与实验表明，由电感和电容组成的匹配电路，使换能器的共振频率发生了变化。
The theory and the experiment show that the matching circuit composed of an inductor and a capacitor can change the resonant frequency and the effective electromechanical coupling coefficient.
理论与实验表明，由电感和电容组成的匹配电路，使换能器的共振频率发生了变化。
The theory and the experiment show that the matching circuit composed of an inductor and a capacitor can change the resonant frequency and the effective electromechanical coupling coefficient.
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