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高速电视摄象机的分率不如摄影胶片高,因此,对像物体振动这样的微小位移测量有时是不可能的。这里,我们提出采用一种光栅罩在物体上,并让这种图象通过另一透明光栅传到相机。通过这种方式就可产生一种莫尔条纹的分辨率相当于原来分辩率的1000倍。同时,我们在视频电视荧光屏上放一坐标障板,这样使我们不仅能够测量以前用电视摄象机看不见的物体的微小位移,而且能获得了实时三维数据。本文还讨论了由曲屏引起的障板误差。
High-speed video cameras are not as good as photographic film, so minute displacement measurements such as object vibrations are sometimes impossible. Here, we propose to employ a grating over the object and pass the image through another transparent grating to the camera. In this way, a moiré pattern can be produced with a resolution equivalent to 1000 times the original resolution. At the same time, we put a baffle on the video screen so that we can not only measure the small displacements of objects that were previously invisible to the TV camera, but also acquire real-time three-dimensional data. This article also discusses the baffle error caused by the curved screen.