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变孔径环形超声换能器的聚焦性能仿真研究
引用本文:陶维亮,马志敏,刘艳. 变孔径环形超声换能器的聚焦性能仿真研究[J]. 声学技术, 2007, 26(2): 330-334
作者姓名:陶维亮  马志敏  刘艳
作者单位:1. 武汉大学电子信息学院,武汉,430070;海军工程大学,武汉,430033
2. 武汉大学电子信息学院,武汉,430070
摘    要: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。

关 键 词:超声  换能器  环形换能器  变孔径  盲区  地形成像
文章编号:1000-3630(2007)-02-0330-05
收稿时间:2005-09-07
修稿时间:2005-09-072005-12-31

Simulation of focusing performance of annular ultrasonic transducer with varying aperture
TAO Wei-liang,MA Zhi-min and LIU yan. Simulation of focusing performance of annular ultrasonic transducer with varying aperture[J]. Technical Acoustics, 2007, 26(2): 330-334
Authors:TAO Wei-liang  MA Zhi-min  LIU yan
Affiliation:1. School of Electronic Information, Wuhan University, Wuhan 430079, China; 2. Navy University of Engineering, Wuhan 430033, China
Abstract: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.
Keywords:ultrasonic  transducer  annular transducer  varying aperture  terrain imaging
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