The direct digital synthesizer (DDS) is used to sweep frequency for a sandwich piezoelectric transducer two admittance circles of the transducer about two different resonance frequencies is measured.
利用直接数字合成器(DDS)对夹心式换能器进行扫频，测得两个不同共振频率附近的导纳圆。
2
By changing the stack position and quantity of the piezoelectricity chip of piezoelectric ceramic sandwichtransducer we can make the washing transducer bear two obvious resonance peaks.
通过改变夹心式换能器压电晶片的堆放位置及组数，使超声清洗换能器具有两个明显的谐振峰。
3
The sandwich piezoelectric transducer is selected after the capability of the two types transducer is analyzed, and then the structure of transducer is designed.