Thermoacoustic efficiency of graphene sound-generators using different structures

Ji-hao XIN; Xing-yue HE; De-bo WANG

doi:10.3788/OPE.20202804.0898

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Thermoacoustic efficiency of graphene sound-generators using different structures

Micro/Nano Technology and Fine Mechanics | 更新时间：2020-08-13

- Thermoacoustic efficiency of graphene sound-generators using different structures
- Optics and Precision Engineering Vol. 28, Issue 4, Pages: 898-903(2020)
- 作者机构：
  
  南京邮电大学电子与光学工程学院、微电子学院，江苏南京 210023
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20202804.0898
  CLC： TB552
- Received：07 August 2019，
  
  Revised：10 October 2019，
  
  Accepted：10 October 2019，
  
  Published：15 April 2020
- 稿件说明：
移动端阅览
Ji-hao XIN, Xing-yue HE, De-bo WANG. Thermoacoustic efficiency of graphene sound-generators using different structures[J]. Optics and precision engineering, 2020, 28(4): 898-903.
DOI：

Ji-hao XIN, Xing-yue HE, De-bo WANG. Thermoacoustic efficiency of graphene sound-generators using different structures[J]. Optics and precision engineering, 2020, 28(4): 898-903. DOI： 10.3788/OPE.20202804.0898.

摘要

为了研究不同石墨烯发声器结构对热声效率的影响，建立了石墨烯发声器的声压解析模型，对单层石墨烯发声器、多层石墨烯发声器以及镍铬基的泡沫石墨烯发声器的发声效率进行了理论与实验研究。首先，介绍了石墨烯发声器的工作原理，建立了石墨烯发声器的周期性温度变化模型和声压解析模型。然后，实验研究了单层石墨烯发声器、多层石墨烯发声器以及镍铬基的泡沫石墨烯发声器的热声效率。实验结果表明：在14~25 kHz内，施加6 V交流电，测距为6 cm的条件下，单层、多层和泡沫石墨烯发声器的最高SPL分别为35.19，20.36和33.42 dB，SPL理论值最高约为37.45 dB。具有较低电阻，较低比热容，较高导热率的石墨烯发声器可以获得较高的热声效率和声压。

Abstract

To study the influence of different graphene sound-generator structures on thermoacoustic efficiency

a sound pressure analytical model was established. Theoretical and experimental studies were conducted on the thermoacoustic efficiency of a monolayer graphene sound-generator

multilayer graphene sound-generator

and nickel/chromium-based graphene foam sound-generator. Firstly

the principle of a graphene sound-generator was introduced. A periodic temperature change model and a sound pressure analytical model of this generator were then established. Finally

the three aforementioned sound-generators were studied using an experimental method. The experimental results show that the maximum SPL values of the monolayer

multilayer

and the graphene foam sound-generator are 35.19

20.36 and 33.42 dB

respectively

in the frequency range of 14~25 kHz when 6 V AC is applied for a distance of 6 cm. The maximum theoretical SPL is approximately 37.45 dB. Graphene sound-generators with lower resistance

lower specific heat capacity

and higher thermal conductivity can achieve higher thermoacoustic efficiency and sound pressure.

关键词

Keywords

references

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