A graphene-based weak sound wave detector

Abstract

The invention relates to a weak acoustic wave detector based on graphene. The weak acoustic wave detector comprises a substrate layer, a piezoelectric material layer is arranged on the substrate layer, an insulating layer is arranged on the piezoelectric material layer, and a graphene layer is arranged on the insulating layer; the acoustic wave detector produces the deformation after the acousticwave is transmitted to the graphene layer, and the dielectric constant of the graphene layer is changed, and the acoustic wave detection is performed by detecting the change of the voltage loaded by the graphene layer; the piezoelectric material layer of the acoustic wave detector can receive the acoustic wave vibration, thereby forming an electric field therein; the electric field can influence the dielectric constant of the graphene layer, thereby realizing the regulating and controlling of the dielectric constant of the graphene layer; and the detector can directly irradiate into the graphene layer through the incident light, so that the dielectric constant of the graphene layer is changed, and the dielectric constant of the graphene layer can be regulated and controlled.

Description

technical field [0001] The invention relates to the technical field of sound wave detection, in particular to a graphene-based weak sound wave detector. Background technique [0002] Acoustic detectors are becoming very important today, either as part of speech transmission devices or as part of photoacoustic detectors in gas analyzers for analyzing gases, for example ambient air. [0003] Commonly used acoustic sensors are designed as capacitive sensors with two diaphragms which are spaced apart from each other and define a capacitor. One of the diaphragms is fixed and the other is displaceable by the sound waves to be detected. The displacement of the movable diaphragm determines the capacitance change of the capacitor, which can be detected by a suitable readout circuit and output as an electrical signal from which properties of the sound wave to be detected, such as the sound pressure, can be deduced. [0004] Although capacitive acoustic wave detectors are characteriz...

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the problem that the existing sound wave detector has a single control mode, which is not conducive to the detection of sound waves in a wide frequency range

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