用光子相关法测量振动频率  

Measurement of Vibration Frequency Based on Photon Correlation

作　　者：王少清[1] 金卫东[1] 张军[1] 徐法升[1] 

机构地区：[1]济南大学理学院,济南250022

出　　处：《光电工程》2009年第11期9-13,共5页Opto-Electronic Engineering

基　　金：山东省自然科学基金项目(Y2001F12);山东省教育厅科技攻关计划资助项目(J04A16)

摘　　要：提出了一种测量振动物体振动频率的新方法,搭建了实验系统,并做了大量的实验。该系统通过接收振动物体的散射光并对其做自相关处理而得到振动物体的振型,通过对自相关数据的快速傅里叶分析给出振动物体的振动频谱。由于采用光纤传输光信号,用光电倍增管作为光子探测器,并采用了自相关和快速傅里叶变换相结合的数据处理方法,使得该系统对光源和被测物体均无特殊要求,适用范围广,操作简便,能够很容易的实现非接触、远距离、网络化在线测量。模拟实验表明,该系统的测量范围可达1～105Hz。A new method for measuring the vibration frequency of a vibrating object was put forward. The experiment system was put up and a lot of experiments were made. The system can give out the vibration model of a vibrating object by receiving the scattered light of the vibrating object and then making an auto-correlation of the scattered light. Moreover, the system gives out the vibration frequency spectrum by doing a Fast Fourier Transform （FFT） to the auto-correlation data. Adopting optic-fiber to transmit the scattered light, adopting a photomultiplier as a photon detector and adopting a data processing technique combined FFT with auto-correlation analysis, the system can work well without any special request both to the light source and the measured object. Furthermore, the system has a wide range of application, being simple to operate, and is easy to be used in non-contacting, long-distance and network way. The simulated experiments indicate that the system works well in a wide frequency range of 1 Hz to 10^5 Hz.

关 键 词：振动 振动频率测量 光子相关 自相关 

分 类 号：O433.1[机械工程—光学工程]