摘要
在复杂水下环境中,图像声呐因其高分辨率、高效率的探测优势,在水下目标识别时发挥着重要作用。多波束图像声呐的发射换能器多采用弧形阵,其具有大波束开角,但存在指向性边缘起伏较大的问题,影响信号强度均匀性。此外,图像声呐发射换能器通常用匹配层技术拓宽工作带宽,以获取更多信息,同时,匹配层的阻抗介于激励源和介质之间,更有利于声能的辐射。该文设计了一款弧形发射换能器,通过对阵列加权的方式来控制波束,减小指向性起伏,并添加了一层匹配层,用以拓展带宽。实际测试结果表明,换能器在130°水平开角内的指向性起伏从3 dB降低至1.5 dB,中心频率为402 kHz,带宽拓宽至217.3 kHz,优化效果显著。
In complex underwater environment,image sonar plays an important role in underwater target recognition due to its high-resolution and high-efficiency detection advantages.The transmission transducer of multi-beam image sonar often uses arc-shaped array,it has a large beam opening angle,but there is a problem of larger directionality edge fluctuations to affect uniformity of signal strength.In addition,image sonar transmission transducer usually uses matching layer technique to broaden working bandwidth,and obtain more information.At the same time,impedance of matching layer is between excitation source and medium,it is more conducive to radiation of sound energy.Here,an arc-shaped transmission transducer was designed to control wave beam by weighting array to reduce directionality fluctuations,and add a matching layer to expand bandwidth.The actual testing results showed that the directionality fluctuation of the designed transducer within a horizontal opening angle of 130°is reduced from 3.0 dB to 1.5 dB;the transducer has a center frequency of 402 kHz and a bandwidth of 217.3 kHz,the optimization effect is significant.
作者
陆炜文
周博文
童晖
张彬
LU Weiwen;ZHOU Bowen;TONG Hui;ZHANG Bin(Shanghai Acoustics Laboratory,Chinese Academy of Sciences,Shanghai 201815,China;University of Chinese Academy of Sciences,Beijing 100049,China;College of Underwater Acoustic Engineering,Harbin Engineering University,Harbin 150001,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2024年第21期187-193,共7页
Journal of Vibration and Shock
基金
国家重点研发计划项目(2022YFB3206900:2022YFB3206902-1)
中国科学院声学研究所自主部署“前沿探索”项目(QYTS202113)
上海市产业协同创新项目(HCXBCY-2022-034)
中国科学院声学研究所东海研究站育新计划项目资助(YXJH202202)。
关键词
1-3压电复合材料
指向性
换能器
弧形阵
1-3 piezoelectric composite material
directionality
transducer
arc-shaped array
