【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。更多还原

【Abstract】 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 105 Hz.更多还原