热致发声器是一种基于焦耳热直接转换为声波的能量转换器,其工作原理是对介质(如空气,水等)中的导体施加交变电流,产生周期性变化的焦耳热脉冲,使周围介质发生周期性膨胀,从而产生声波,即热致发声.热致发声器具有频响范围宽、无需振动元件的显著特点,在模拟发声、三维成像等领域具有潜在的应用.因此,近年来受到人们的广泛关注.南京航空航天大学纳米科学研究所郭万林教授团队以三维泡沫状石墨烯材料构建热声元件,发现其能显著抑制基底热散失,产生高的声压,提高发声效 Thermoacoustic device is a kind of energy converter based on Joule heat direct conversion to sound wave. Its working principle is to apply alternating current to the conductor in medium (such as air, water, etc.) to generate periodic Joule heat pulse Periodic expansion of the surrounding medium, resulting in sound waves, that is caused by thermal sound.With a wide range of frequency response, vibration-free components of the salient features in the analog sound, three-dimensional imaging and other fields has potential applications.So in recent years By the people’s attention.Nanjing University of Aeronautics and Astronautics Institute of nano-Professor Guo Wanlin team to three-dimensional foam-like graphene materials, the construction of thermoacoustic components found that it can significantly inhibit the substrate heat loss, resulting in high sound pressure and improve the sound effect