大型机械零件表面的平面度误差的测量,国内外一直处于难以解决的课题。采用传统方法:如水平仪法,自准直仪法等,测量周期长,测量精度也不高,不能适应近年来科学技术发展 Large-scale mechanical parts surface flatness measurement error, both at home and abroad have been difficult to solve the problem. The traditional methods: such as the level of law, since the autocollimator method, the measurement period is long, the measurement accuracy is not high, can not adapt to the development of science and technology in recent years