激光干涉法获取远程声音信息的实现  

Detecting sound information from long distance by laser interference

作　　者：乔俊卿[1] 赵琰[1] 宛传旭[1] 张权[2] 赵伟[2] 张增明[2] 

机构地区：[1]中国科学技术大学物理学院,安徽合肥230026 [2]中国科学技术大学物理实验中心,安徽合肥230026

出　　处：《物理实验》2013年第5期5-8,17,共5页Physics Experimentation

基　　金：国家自然科学基金理科物理学基地项目(2011);中国科学技术大学教学项目(2011)

摘　　要：被监听物体的振动产生的光程差导致参考光和监听光干涉的条纹发生变化,利用硅光电池接收干涉条纹的变化可获得被监听物体表面的振动情况,实现对声源远程监听.频域图很好地反映出用激光干涉法获取的声音接近原音频.The interference fringes produced by the reference and the monitoring light varied with the vibration of the monitored object. A silicon photocell was employed to detect the variable fringes, and then the information of the sound was obtained. The analysis in frequency domain indicated that the sound frequency obtained by this interference method was closed to that of the original sound.

关 键 词：激光干涉 激光窃听 振动 漫反射 

分 类 号：O436[机械工程—光学工程]