低多义性误差的条纹反射技术系统结构研究

条纹反射技术中的多义性误差将直接影响测量结果的精度,现有的多义性误差消除方法会大大增加系统复杂程度,且只能补偿部分的误差。推导了条纹反射系统不含多义性误差的准确相位-梯度解析模型,对该模型仿真分析得出:当系统设置满足进入相机的光线与参考平面和显示屏都成90°夹角条件时,系统多义性误差近乎为0的结论,基于此,提出一种基于同轴光路系统结构,实验证明了所提出的同轴光路系统结构在物体表面高度从0增加至3 mm时多义性误差始终近乎为0,普通系统结构的多义性误差随着物体表面高度从0增加到3 mm时,多义性相位误差从0增加至1.5 rad,实验证明使用提出的同轴系统可以大大抑制条纹反射技术中的多义性误差。

Structure of fringe reflection technique with low phase ambiguous error

In fringe reflection technique, the phase ambiguous error can influence the measurement result directly. The existing error reduction methods to compensate this error are inflexible and can only reduce a part of this error. An accurate phase-slope analytical model without phase ambiguous problem is deduced. Based on the simulation of the deduced model, it is found that phase ambiguous error can close to zero when the system light rays are both perpendicular to the reference plane and the display screen. A system based on the co-axial optical path is proposed to achieve this system setup. In our experiment, with the increasing of the test surface height from 0 to 3 mm, the proposed co-axial system is proved to have the phase ambiguous error always close to zero. Meanwhile, the phase ambiguous error in the tradition system increases from 0 to 1.5 rad when the test surface height rises from 0 to 3 mm.