简易次声振动及监测实验装置设计  

Compact and simple infrasound vibration and measurement experimental device

作　　者：黄贞[1] 李栋宇[1] 昊林富[1] 高其中[1] 

机构地区：[1]湛江师范学院物理科学与技术学院,广东湛江524048

出　　处：《大学物理》2012年第10期31-34,共4页College Physics

基　　金：湛江师范学院校级科研项目(L1106)基金资助

摘　　要：本装置利用低频扬声器作为模拟次声振源,并基于光反馈自混合干涉原理,将次声信号转换为自混合干涉信号,利用快速傅里叶变换进行分析,进而得到次声波的频率和强度.实验结果表明,该装置能够准确地测量出次声振动频率,并对其幅度进行监测.装置光路简单,结构紧凑、易实现,可推广应用于次声波检测的实验教学和监测实践.By using low-frequency speaker as a vibration source and optical feedback self-mixing interference effect to convert infrasound vibration into self-mixing interference signal to detect the frequency and intensity, we design a compact and simple infrasound vibration and measurement device for experimental teaching. According to the result testing in the simulation environment of infrasound, this device can measure the infrasound signal correctly.

关 键 词：:次声振动 自混合干涉 傅里叶变换 

分 类 号：O429[理学—声学]