提出了动态白光数字散斑计量术,并研制了相应的实验测量系统。在系统启动脉冲的触发下,动态白光数字散斑计量系统中物体动态加载、脉冲白光光源照明、数字散斑图像采集等过程依次完成。该系统可通过延时调节,对可重复动态过程的位移演化进行全过程测量。

A speckle metrology technique called dynamic white-light digital speckle photography is proposed, and an automatic measurement system of dynamic displacement or strain field is developed. The system procedure is designed so that the flashing illumination, the CCD camera, the grabbing card and the analog-to-digital converter can all work simultaneously. Two specklegrams of the specimen, one before and one after the deformation are captured. The time delay between two exposures is controlled by setting a certain numeral value in the Boxcar and the dynamic displacement in the deformation process of the specimen is recorded in serial specklegrams. The system is tested successfully.