摘要
搭建了教学用光声效应实验装置,使用3种粒度的硅粉进行扫频光声检测,比较了非共振频率区和共振频率区的硅粉光声信号幅值特征.该实验装置为学生开展光声效应实验提供了基础平台,基于此平台可以设计光声盒,测量固体材料的热学参量,开发调制电路和数字锁相放大器.
A set of experimental equipment of photoacoustic effect was developed for experimental teaching.Frequency-scanning photoacoustic detection of silicon power was performed,respectively,by using three sizes of particles in order to check the property of the experimental equipment;then the amplitude of the photoacoustic signals at resonant and non-resonant conditions were compared.This set of experimental equipment enabled students to carry out series of basic experiment,such as designing photoacoustic box,measuring heat parameters of solid material and developing modulate circuit and digital lock-in amplifier.
出处
《物理实验》
2015年第12期5-8,共4页
Physics Experimentation
基金
同济大学第9期实验教学改革项目(No.33)
关键词
光声效应
幅频特性
扫频光声检测
photoacoustic effect
amplitude-frequency characteristic
frequency-scanning photoacoustic detection
