超声相控阵技术中的声场仿真

从单个矩形压电晶片的辐射声场表达式出发,定性分析了主要因素对声压强度及指向性的影响,提出了最小化主瓣及抑制栅瓣的具体方法。以16晶片相控阵探头为例,推导了叠加声场的表达式,分析了合成声压与焦点和换能器距离的关系。仿真并讨论相控阵探头晶片单元个数、晶片间距等因素对合成声束质量的影响,仿真结果与理论分析相吻合,为矩形相控阵探头声场评价及高性能相控阵探头的制作提供了参考。

Simulation for Sound field of Ultrasound Phased Array Technique

Based on radiant sound field expression for single rectangular piezoelectric wafer,this paper gives analysis the infection each factor causing to sound pressure intensity and directivity,concrete methods to minimize major lobe while narrowing side lobes is put forward.As an example,the paper derives superimposed sound field formula for 16-wafer phased array probe,analyzes relationship of superimposed sound pressure and distance between focus and transducer,simulates and discusses influence on the quality of synthetic sound beam of phased array probe by factors such as element number,distance of adjacent elements.Simulation result is considerably consistent to related theory,which provides reference for evaluation and measurement for sound distribution and production of high-quality phased array probes.