Tong L H, Lai S K, Lim C W
School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang, Jiangxi, People's Republic of China.
Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, People's Republic of China.
J Acoust Soc Am. 2017 Apr;141(4):2430. doi: 10.1121/1.4979667.
Thermo-acoustic (TA) transducers are generation of sound speakers without any mechanical vibration system which exhibit an extremely wide frequency response range. In this paper, acoustic field responses to broadband input signals applied to both free-standing and nano-thinfilm-substrate thermo-acoustic devices are developed theoretically by using the Fourier transformation. A series of signals, including single-frequency signal, square root signal, periodic triangle wave signal, and periodic rectangular pulse signal, are applied to these TA devices in simulations and the acoustic pressure responses are investigated. The reproducibility of input signals is predicted. The single frequency results show good agreement with previously published experimental results. Alternative methods for reproducing the original signals with small distortion and low power consumption are introduced. The excellent performance of the TA devices on broadband signal responses will provide a design approach for sound parametric array and underwater communication equipment.
热声（TA）换能器是一种没有任何机械振动系统的发声扬声器，具有极宽的频率响应范围。本文利用傅里叶变换从理论上推导了施加到独立式和纳米薄膜基底热声器件上的宽带输入信号的声场响应。在模拟中，将一系列信号，包括单频信号、平方根信号、周期性三角波信号和周期性矩形脉冲信号，施加到这些TA器件上，并研究了声压响应。预测了输入信号的再现性。单频结果与先前发表的实验结果显示出良好的一致性。介绍了以小失真和低功耗再现原始信号的替代方法。TA器件在宽带信号响应方面的优异性能将为声参量阵和水下通信设备提供一种设计方法。
