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目的：消除牙冠外形三维光学测量系统的系统误差和位相分布测量计算误差。方法：用牙冠外形三维光学测量系统测量标准石膏模型，确定位相分布与该石膏模型表面高度的关系。结果：得到一个位相—高度映射关系曲线。结论：可以消除系统误差和位相分布测量计算误差的影响，其最终测量误差只与标定实验过程本身的系统误差和随机误差有关。
OBJECTIVE: To eliminate systematic error and phase distribution measurement error of three dimensional optical measurement system of dental crown. Methods: The standard gypsum model was measured with the dental crown three-dimensional optical measurement system to determine the relationship between the phase distribution and the surface height of the gypsum model. Result: A phase-height mapping is obtained. Conclusion: The systematic error and phase distribution measurement error can be eliminated. The final measurement error is only related to the systematic error and random error in the calibration experiment.