Abstract
MEMS ciliary vector hydrophone is used for underwater low-frequency acoustic signal testing, but it is limited by mutual inhibition of bandwidth and sensitivity. A crossed-circle bionic vector hydrophone is proposed in this paper. It uses two circular structures to increase receiving area of sound waves and improve sensitivity. At the same time, it improves working bandwidth of the hydrophone by reducing thickness of circular structure and adopting hollow cylinder. In this paper, COMSOL simulation software was used to carry out simulation and analysis of stress distribution and natural frequency, and determine the optimal size of crossed-circle structure. Experiments show that sensitivity of the hydrophone was measured to reach −184.5 dB@1250 Hz（0dB = 1 V/μPa）, and the working bandwidth was 20–1250 Hz, the sensitivity reaches −186.7 dB at 1000 Hz, 10.4 dB higher than that of single-cylinder structure. The depth of pit exceeds 30 dB at 315 Hz and 630 Hz, indicating that the hydrophone has excellent dipole directivity.
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