Optimization design of small image sonar transmission transducer

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (21) : 187-193.

LU Weiwen1,2, ZHOU Bowen1, TONG Hui1,3, ZHANG Bin1

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Abstract

In the complex underwater environment, imaging sonar plays an important role in identifying underwater target recognition because of its high-resolution detection and high efficiency. The emission transducers of multi-beam imaging sonar mostly use arc array, which has wide directional range. But there is a problem of large directional fluctuation at edge, which affects the uniformity of signal intensity. In addition, the transducer usually uses the matching layer technology to broaden the working bandwidth for more information. The impedance of the matching layer is between the excitation source and the medium, which is conducive to the radiation of sound energy. This paper designs a 400kHz arc emission transducer, which controls the beam by weighting the array to reduce directional fluctuations and adds a matching layer to the transducer. The results show that the horizontal directional fluctuation in 130°is reduced from 3dB to 1.5dB, the central frequency is 402kHz, and the bandwidth is broadened to 217.3kHz. The optimization effect is significant.

Key words

1-3 Piezoelectric composite / Directivity / Transduecr / Arc array

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LU Weiwen1, 2, ZHOU Bowen1, TONG Hui1, 3, ZHANG Bin1. Optimization design of small image sonar transmission transducer[J]. Journal of Vibration and Shock, 2024, 43(21): 187-193

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