光学自由曲面计算机控制加工中的形面检测研究

Study on Profile Measuring in Computer Controlled Fabrication of Optical Free form Surface

光学自由曲面可以实现特殊的成像效果，给光学设计提供了更大的自由度，计算机控制加工方法可以在低精度设备上加工出高精度的光学自由曲面。自由曲面的形面检测是决定其最终加工精度的关键因素。本文讨论了自由曲面的形面检测方法，研究了自由曲面的坐标测量法，提出了快速自由曲面坐标测量法，并进行了验证。结果表明采用快速自由曲面测量法可以大大缩短测量时间，测量精度在测量机的精度范围内。

Optical free form surfaces can be empolyed to realize some special imaging effects and supply more degree of design freedom. These free form surfaces can be manufactured by compute controlled fabrication (CCF) method on low accuracy machine tool. The profile measurement studied is a key factor that determines the finish accuracy of the optical free form surfaces in CCF, especially the coordination measuring method. Rapid coordinate measuring method (RCMM) is proposed with case study. Results indicate that measruing time can be largely reduced by RCMM, with no measuring accuracy losing.