薄炭黑层光致发声效应的实验探究  

Photoacoustic effect in a thin carbon black layer

作　　者：唐鸿洋 陆青山[1] TANG Hong-yang;LU Qing-shan(School of Physical Science and Technology,Inner Mongolia University,Hohhot 010021,Chia)

机构地区：[1]内蒙古大学物理科学与技术学院,内蒙古呼和浩特010021

出　　处：《物理实验》2020年第12期28-32,共5页Physics Experimentation

基　　金：内蒙古自然科学基金项目(No.2018MS05014)。

摘　　要：研究了带盖玻璃罐经蜡烛熏黑一半内壁,在交流电白炽灯照射时产生“嗡嗡”声的原理.结果表明:光白炽灯光周期性加热了炭黑颗粒导致其体积周期性膨胀,空气被扰动发声,玻璃罐起到回声放大的作用.The glass jar blackened in half inside buzzed when it was illuminated by AC incandescent lamp.The photoacoustic effect was investigated.The results showed that the carbon black particles were heated by periodic AM light,which caused their periodic thermal expansion and disturbed the surrounding air to generate sound effect.The glass jar mainly played the role of echo amplification.

关 键 词：光声效应 热弹性 IYPT 

分 类 号：O421[理学—声学]