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Design and simulation of two-dimensional graphene-based acoustic sensor arrays

It is difficult to capture pure speech signals with a single acoustic sensor since the speech signal and noise signal are often overlapped in the spectrum. Besides, it is also hard to receive the three-dimensional and real-time acoustic data of measured objects by a single acoustic sensor. In this paper, we propose a new type 2-D acoustic sensor array based on graphene film, which consists of 256 (16×16) elements. The overall structure of the acoustic array consists of three parts: upper plate acting as a support, vibration film made by graphene film and lower plate with amplifying circuit. The result of simulations based on a single element shows that the graphene film has a resonant frequency of 25 kHz and a flat frequency response that covers from 1 kHz to 90 kHz. It makes the acoustic array suitable for acoustic imaging and sound source location through related algorithm.