To address the low-power consumption and detection requirements for equipment carried by underwater unmanned platforms. This work proposes the idea of resonant sensitive detection based on target spectral features; that is
the sensitive structure of a hydrophone is designed
leveraging the high sensitivity of hydrophones at the resonant frequency
based on the frequency domain characteristics of underwater targets. Building upon this idea
several piezoelectric MEMS resonant sensitive chips and characteristic sound pressure hydrophones for target frequency domain feature information were designed and developed
and experimental tests were conducted. Sound pressure hydrophone prototypes M3 and M5 achiev
ed high sensitivity responses at their resonant frequencies of -146 dB@12 kHz (Re.1V/μPa)和-138 dB@4 kHz (Re.1V/μPa). These prototypes exhibited self-noise levels far below the Knudsen sea state zero noise levels at the resonant frequency: the equivalent noise spectral density level of M5 prototypes at the resonant frequency was 22.03 dB@4 kHz(Re. 1μPa/
$$ \sqrt{\mathrm{Hz}}$$
)). The proposed concept of resonance-sensitive detection based on target feature information provides a new approach for underwater target detection.
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references
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