基于电子散斑剪切干涉技术的振动检测研究

Vibration Detection Based on Electronic Speckle Shearing Interferometry

为实现物体振动的测量,将频闪照明和电子散斑干涉技术相结合测量物体振动,利用比被测物体振动周期短的脉冲激光照明物体,将物体在一个振动周期内的两个位置当作双曝光静态变形来处理。采用虚拟仪器软件LabVIEW控制同步信号,以四周固定的矩形平板为测量对象,得到了激振频率为100Hz和200Hz时的干涉条纹图。实验结果表明该系统结构简单且具有很高的同步精度。

For the realization of the object vibration measurement,stroboscopic lighting and electronic speckle pattern in-terferometry are combined to detect vibration,using a short pulse laser illuminate object which possesses shorter vibra-tion than the measured object.And then handle the object＇s two positions in one vibration cycle as static deformation of double exposure.Control synchronizing signal using virtual instrument software LabVIEW,the rectangular plate with around fixed as a measuring object,obtained interferogram when the excitation frequency of 100Hz and 200Hz.The experimental results indicate that the system is simple and has high synchronization accuracy.