变孔径环形超声换能器的聚焦性能仿真研究

在河工模型地形测量应用中,为适应提高方位向分辨率和减小盲区的要求,提出一种变孔径环形超声换能器的设计,并分析了该换能器的聚焦性能及其随目标点距离变化的情况。该换能器使用环形结构,能得到方位向的高分辨率,提高地形成像的质量;利用变孔径技术,又保证在对较大起伏地形进行成像时,保持了最佳的显示效果。分析结果表明,设计的超声换能器在提供较高方位向分辨率的同时,有效地减小了近场盲区,满足河工模型地形测量的要求,并为其它成像系统和医学应用提供参考。

Simulation of focusing performance of annular ultrasonic transducer with varying aperture

To meet the requirements of high resolutions in horizontal directions and reducing blind region in terrain imaging of a river model,we propose a design of an annular shaped ultrasonic transducer with a varying-aperture.We analyze its focusing performance,and performance changes with the distance between the transducer and the target.Since the annular structure is used,it can provide high resolution in azimuth to improve the terrain imaging quality.In addition,the best display quality can be obtained for rough terrains for the aperture is variable.Simulation results show that the transducer has a high horizontal resolution.and the blind region is reduced eff-ectively.It can be used in terrain measurement of rivers and other imaging systems and medic-inal applications.