Abstract
Inspired by the hairy structure of fish neuromast, a multiple sensor units (multi-unit) vector hydrophone is proposed in the paper, which integrates multiple sensor units on one chip according to bionics. Its sensitivity and signal noise ratio (SNR) are theoretically analyzed compared with the hydrophone which has only one sensor unit. In order to verify the correctness of the theory, a 4-unit vector hydrophone has been fabricated. For experiments, the comparative calibration experiment is used to validate the theoretical analysis of sensitivity and fast fourier transform algorithm (FFT) is used to process the experiment data to verify the theoretical analysis of SNR. The results show that the sensitivity of the 4-unit hydrophone is improved by 11.8 dB and the SNR is improved by 1.9 dB on average, which is correlated with the theoretical analysis.
Highlights
Engineers, designers and architects often look to nature for inspiration
It is significant for the study of lateral line in bionics and there are many artifcial lateral line works, such as wheel flow meters, pressure probes and hot-wire anemometers lateral meters.[3]
Inspired by the hairy structure of fish neuromast, a multi-unit vector hydrophone is proposed in the article according to bionics
Summary
Designers and architects often look to nature for inspiration. There is nothing new about borrowing design ideas from nature, but this has received a new name bionics or biomimetics.[1] It has been proved that the lateral line of fish is important in complex behaviors such as rheotaxis.[2] it is significant for the study of lateral line in bionics and there are many artifcial lateral line works, such as wheel flow meters, pressure probes and hot-wire anemometers lateral meters.[3]. Some related bionic research has been conducted by North university of China,[4,5,6,7,8] and the 1-unit vector hydrophone has been fabricated.[4] it’s meaningful to improve the performance in order to obtain underwater acoustic information in worse environment. Inspired by the hairy structure of fish neuromast, a multi-unit vector hydrophone is proposed in the article according to bionics. The methods of comparison calibration test and FFT are conducted to verify the correctness of the theory
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