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介绍一种应用光学投影放大原理和光栅尺莫尔条纹侧长技术的数字显示式光学投影仪。使用此仪器可对直径50mm，长度500mm以内的各种形状复杂的轴类或丝杠类零件进行非接触测量。仪器不但可以检测零件的局部形状误差，而且可以测量零件的径向尺寸和轴向尺寸，其测量误差均小于0．01mm。
A digital display type optical projector which uses the principle of optical projection magnification and the moire fringe length technology of grating is introduced. The instrument can be used for non-contact measurement of a variety of complex shaft or screw type parts with a diameter of 50mm and a length of 500mm. The instrument can not only detect the local shape error of the part, but also measure the radial dimension and the axial dimension of the part. The measurement error is less than 0.01mm.