【摘要】 <正> 云纹方法的基本原理用激光全息和激光散斑方法来测量振动物体的振型,不仅对实验装置要求很高,而且对较大振幅振型的测量无能为力.我们将面内云纹方法和频闪方法相结合,成功地解决了这一测量问题. 在有机玻璃模型梁的表面贴上光栅胶片,用自己试制的同步闪光仪,拍下振动的两个极限位置的两次曝光底片,通过光学空间滤波技术,获得了清晰的等挠度条纹图,定量地获得了振型曲线.更多还原

【Abstract】 A stroboscopic in-plane moire method is developed for studying in-plane deformation of structures under general periodic oscillations. The method is better than the time average method in that it has twice the sensitivity and better fringe quality. Furthermore, it does not require calibration when nonsinusoidal periodic vibrations are studied更多还原