平凹柱面换能器线阵声场研究

Study on the Sound Field of Plano-concave Cylinder Transducer Array

提出了一种用平凹柱面换能器作为阵元的新型一维超声线阵。将平凹柱面换能器线形排列构成线阵,建立阵元及线阵的声场分布的数值模型,对其声场分布受线阵参数的影响和对线阵声束的控制进行了研究,并对其声场进行了数值模拟。研究表明,可用平凹柱面换能器作为阵元构成线阵,线阵的指向性在阵元的长度方向上受阵元长度影响,在宽度方向上可通过调节线阵的参数实现,线阵声场在对阵元不加相控的情况下表现出聚焦特性,且其声束辐射方向及其焦点位置可通过阵元激励相位进行控制。在对检测深度变化较小的情况下,这种线阵可用来进行无损检测。

This article proposed a new kind of one-dimensional linear array taking array element with the plano-concave cylinder transducer.The plano-concave cylinder transducer was linear arranged to be a linear array.Numerical model of sound field of element and array were established.Study on the effect of array parameter to its sound field distribution and the sound beam control was finished.The numerical analysis and the simulation of the sound field were carried on.It′s found that the directivity in the array element length direction was influenced by the element length,which could be done through the adjustment of array parameter in the width direction.Sound field of the array showed a focusing character on the condition of with no control of array element,and the radiation direction of the beam and the focus zone could be controlled through the stress phase of the element.This kind of array could be used to non-destructive test with less change of the detection depth.