利用光学投影系统将标准格栅投射到被测物件表面,形成携带有被测表面三维信息的变形格栅。此变形格栅经摄象物镜成象在另一标准格栅表面,此两个格栅重合后得到带有莫尔等高条纹的被测物件图象。再由1倍的光学转象系统将此图象成象在摄象机的靶 A standard grid is projected onto the surface of the object under test using an optical projection system to form a deformation grid that carries the three-dimensional information of the surface under test. The deformed grating is imaged on the surface of another standard grating by the imaging lens, and the images of the measured object with the moiré stripes are obtained after the two grids are overlapped. This image is then imaged at the camera’s target by a 1X optical transfer system