| 王成,李双,邱鑫,范学良,李成.氧化铟锡薄膜的磁感应热声分析*[J].,2023,42(1):116-122 |
| 氧化铟锡薄膜的磁感应热声分析* |
| Induction thermoacoustic analysis and application of the Indium Tin Oxide film |
| 投稿时间：2021-11-27 修订日期：2022-12-25 |
| 中文摘要: |
| 基于优良导体在磁场下的涡流效应理论和固体的热声效应理论，建立了氧化铟锡（ITO）导电薄膜磁-热-声效应的理论模型，推导了导电薄膜热致发声的温度振荡和输出声压表达式。对有基底的ITO导电膜进行了磁场下的热声理论计算和实验测试，结果表明：薄膜的温度振荡值随频率呈上升趋势，与电-热-声模型相比趋势相反；薄膜声压的理论值与实验值在频域内的变化趋势基本吻合，验证了理论模型的正确性。进而，根据磁-热-声的理论模型，分析了线圈相关参数对薄膜声压级的影响，结果表明：薄膜声压级随着线圈匝数的增加而增大，随着薄膜与线圈中心距离的增加而减小，随着线圈半径的增加而减小。文中的研究结果拓展了导电薄膜在扬声器等领域的应用。 |
| 英文摘要: |
| Based on the theory of eddy current effect of an excellent conductor in magnetic field and the theory of thermoacoustic effect of solids, a theoretical model of the magneto-thermo-acoustic(MTA) effect of the indium tin oxide film was established. The temperature oscillation and the sound pressure expression of MTA from the film were derived. The thermoacoustic theoretical calculations and experimental test of ITO film with a substrate under magnetic field were carried out. The result shows that the temperature oscillation value of the film increases with the frequency, which is the opposite trend compared with the traditional electro-thermo-acoustic model; and the change trend of the theoretical value of the film sound pressure and the experimental value in the frequency domain is basically coincide, which effectively validates the theoretical model. Furthermore, according to the theoretical model of MTA, the influence of the relevant parameters of the coil on the sound pressure level of the film was analyzed, and it shows that the sound pressure level generated by film increases as the number of turns of the coil increases and decrease as the distance between the film and the center of the coil increases as well as the coil radius increases. This research to a certain extent expands the application of ITO films in loudspeakers and other fields. |
| DOI：10.11684/j.issn.1000-310X.2023.01.015 |
| 中文关键词: 磁场 导电膜 热声效应 频率 声压级 |
| 英文关键词: magnetic field conductive film thermoacoustic frequency sound pressure level |
| 基金项目:国家自然科学基金面上项目（51875374）和国家自然科学基金面上项目（11972240） |
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