Page 120 - 《应用声学》2023年第1期

第 42 卷 第 1 期 Vol. 42, No. 1
2023 年 1 月 Journal of Applied Acoustics January, 2023

⋄ 研究报告 ⋄

氧化铟锡薄膜的磁感应热声分析 ∗

王 成 李 双 † 邱 鑫 范学良 李 成

(苏州大学轨道交通学院 苏州 213151)
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。
关键词：磁场；导电膜；热声效应；频率；声压级
中图法分类号: TB52+2 文献标识码: A 文章编号: 1000-310X(2023)01-0116-07
DOI: 10.11684/j.issn.1000-310X.2023.01.015

Induction thermoacoustic analysis and application of the

Indium Tin Oxide film

WANG Cheng LI Shuang QIU Xin FAN Xueliang LI Cheng

(School of Rail Transportation, Soochow University, Suzhou 213151, China)

Abstract: 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 (ITO) 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.
Keywords: Magnetic field; Conductive film; Thermoacoustic; Frequency; Sound pressure level

2021-11-27 收稿; 2022-01-18 定稿
国家自然科学基金面上项目 (51875374, 11972240)
∗
作者简介: 王成 (1991– ), 男, 河南信阳人, 硕士研究生, 研究方向: 微纳米薄膜的热声特性分析及应用。
† 通信作者 E-mail: lishuang@suda.edu.cn