Water–air acoustic communication based on broadband impedance matching

Author:

Zhou Ping12ORCID,Jia Han23ORCID,Bi Yafeng1,Yang Yunhan12,Yang Yuzhen1ORCID,Zhang Peng12ORCID,Yang Jun12ORCID

Affiliation:

1. Key Laboratory of Noise and Vibration Research, Institute of Acoustics, Chinese Academy of Sciences 1 , Beijing 100190, People's Republic of China

2. University of Chinese Academy of Sciences 2 , Beijing 100049, People's Republic of China

3. State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences 3 , Beijing 100190, People's Republic of China

Abstract

Efficient acoustic communication across the water–air interface has always been expected in the field of ocean exploration. However, the existing research works are mainly concentrated on the narrow-band transmission based on resonance, which greatly limits the transmission capacity and efficiency. Here, we combined air-based and water-based metafluids to realize an exponential gradient impedance matching layer for broadband water–air sound transmission. By cooperatively adjusting the sound velocity and thickness in the matching layers, we modulated the required acoustic parameters of each layer into a reasonable range, which can be conveniently achieved by the proposed metafluids. A matching layer sample was constructed and validated in a water tank. Experimental results show that the proposed matching layer can achieve an average sound energy transmission enhancement above 16.7 dB from 880 to 1760 Hz across the water–air interface. A water–air acoustic communication scene was further experimentally demonstrated through transmitting a multicolor picture from air to water, which shows extremely high communication capacity and accuracy. Our work is promising for more applications based on water-air transmission and opens an avenue to the design and implementation of the extreme impedance matching case.

Funder

Key-Area Research and Development Program of Guangdong Province

National Nature Science Foundations of China

IACAS Frontier Exploration Project

Publisher

AIP Publishing

Subject

Physics and Astronomy (miscellaneous)

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