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首页> 外文期刊>European journal of physics: A journal of the European Physical Society >Demonstration of acoustic resonances in a cylindrical cavity applying the photoacoustic technique
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Demonstration of acoustic resonances in a cylindrical cavity applying the photoacoustic technique

机译：圆柱形腔中声学谐振的示范应用光声技术

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摘要

In this work we present some experiments which can be performed in college or on the first courses of university to acquire knowledge about resonant acoustical phenomena in closed cavities in a tangible way, through experiments based on the photoacoustic effect in gases. This phenomenon consists in the generation of acoustic waves after optical excitation of an absorbing gas and further local heating of the non-absorbing surrounding gas by energy exchange through collisions between molecules of both species. Simple experiments, performed with daily live elements, can be very useful for teachers and students to get in touch with the phenomenon of acoustic resonances with the addition of concepts about light-matter interaction. The setups consist of the resonant cavity, the illumination source and the signal detection-acquisition scheme. In this paper a closed glass test tube is used as the resonant cavity and is filled with a mixture of nitrogen dioxide and air. The illumination is performed by a pulsed power LED modulated at different resonant frequencies of the cavity. A microphone inside the tube is connected to an oscilloscope which displays the photoacoustic signal. The LED is moved along the tube showing how different resonant modes can be excited.
机译：在这项工作中，我们展示了一些可以在大学或大学的第一个课程中进行的一些实验，以通过基于气体的光声效应的实验来获得关于闭孔中的谐振声学现象的知识。这种现象在吸收气体的光学激发之后的声学波的产生以及通过通过两个物种的分子之间的碰撞通过能量交换进一步通过能量交换进行非吸收周围气体的进一步加热。用日常生活元素进行简单的实验，对教师和学生来说非常有用，以通过增加关于浅品相互作用的概念来取得与声学共振的现象保持联系。设置包括谐振腔，照明源和信号检测采集方案。在本文中，使用封闭的玻璃试管作为谐振腔，填充有二氧化氮和空气的混合物。通过在腔的不同谐振频率下调制的脉冲功率LED来执行照明。管内的麦克风连接到示波器，示出器显示光声信号。 LED沿着管道移动，示出了如何激发不同的谐振模式。

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