论文标题
超速温度热声学的石墨烯气管
Graphene Aerogels for Ultrabroadband Thermoacoustics
论文作者
论文摘要
声音通常是通过机电振动结构在介质中产生的。结构的几何尺寸和惯性设置了声音转移机制中的频率截止，并且通常需要不同的振动结构才能覆盖从插射到超声的整个范围。没有发射极的物理运动的替代机制是热声效应，在导电材料中焦耳加热产生声音。在这里，我们表明，基于石墨烯气凝胶的单个热声换能器可以发出超人物的声音，从插射（1 Hz）到超声（20 MHz），而没有谐波失真。由于传统的声音传感器由于其转导机制而受到频段的限制，因此超人行的石墨烯气氛可为常规的Hi-fi扬声器以及Infrasound和超声传感器提供有效的替代方案。
Sound is usually generated in a medium by an electromechanical vibrating structure. The geometrical size and inertia of the structure set the frequency cutoff in the sound-transduction mechanism and, often, different vibrating structures are necessary to cover the whole range from infrasound to ultrasound. An alternative mechanism without any physical movement of the emitter is the thermoacoustic effect, where sound is produced by Joule heating in a conductive material. Here we show that a single thermoacoustic transducer based on a graphene aerogel can emit ultrabroadband sound from infrasound (1 Hz) to ultrasound (20 MHz), with no harmonic distortion. Since conventional acoustic transducers are frequency band limited due to their transduction mechanism, ultrabroadband graphene aerogels may offer a valid alternative to conventional hi-fi loudspeakers, and infrasound and ultrasound transducers.
