Static behavior of a graphene-based sound-emitting device
Static behavior of a graphene-based sound-emitting device
复制标题
基于石墨烯的发声装置的静态行为
DOI：
10.1039/c2nr30417a
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发表时间：
2012-01-01
期刊：
影响因子：
6.7
通讯作者：
Liu, Li-Tian
中科院分区：
文献类型：
--
作者：
Tian, He;Xie, Dan;Liu, Li-Tian
由于石墨烯的极高的热导率和单位面积的低热容量，可以制造基于热声效应的高效发声装置，而没有机械振动。在本文中，这种新的石墨烯声发射器件（G-SED）的基本性能的静态行为方面进行了研究。声幅图表明，G-SED在0.01W以下具有良好的声性能。在不同距离和角度下测量的声频谱表明，G-SED具有良好的声指向性。通过使用G-SED阵列可以实现声波操纵。利用热成像仪研究了石墨烯的温度与声波频率的关系。用60 μ s短时间多脉冲和单脉冲记录了真实的快速瞬态声响应。在固定频率下连续工作几个小时，观察到在恒定声压幅值下具有低噪声的稳定声发射。这种G-SED中的显著性能表明了广泛的应用，并阐明了石墨烯在声学领域的应用。
Due to the extremely high thermal conductivity and low heat capacity per unit area of graphene, it is possible to fabricate an efficient sound-emitting device based on the thermoacoustic effect with no mechanical vibration. In this paper, the fundamental performance of this new graphene sound-emitting device (G-SED) is investigated in terms of its static behavior. The sound amplitude mapping shows that the G-SED has good sound performance under 0.01 W. The sound frequency spectra measured at different distances and angles show that the G-SED has good sound directivity. It is possible to realize sound wave manipulation by using an array of G-SEDs. The relationship between the temperature of graphene and the sound frequency was investigated by a thermal imaging instrument. The fast transient sound response in real time was recorded by applying 60 mu s short time multi-pulses and single-pulse. The stable sound emission at a constant sound pressure amplitude with low noise was observed for continuous operation under a fixed frequency over several hours. Such significant performances in this G-SED indicate broad applications, and shed light on the use of graphene in the field of acoustics.