The result shows that in order to obtain the strong echo signal, a suitable selection of the ultrasonic transducer operating frequency is necessary.

由此表明，选择合适的声发射换能器，有助于提高液位检测回波信号的强度。

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The operating principle, the designing and fabricating method of optic fiber magnetostrictive transducer are introduced in the thesis.

本文介绍了磁致伸缩换能器的原理和设计制作方法。

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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.

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。

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