通过建立非理想正交反射镜改变光线的几何模型，研究正交金属反射镜的消偏性能。模拟计算结果显示：在0．4μm～10μm波段内，非理想正交镀银反射镜的线偏振灵敏度优于铝、金等正交反射镜，且对光束偏振度的改变最小，因此正交镀银反射镜在高精度偏振遥感探测中值得广泛应用；若把角度误差控制在0．5。内，则正交镀银反射镜的偏振特性对偏振遥感器的辐射度和偏振度影响很小，具有较好的消偏性能。

Depolarization of imperfect metal orthogonal twin mirrors is studied by building a geometric model of the mirrors to change the direction of light ray. The simulation study shows that linear polarization sensitivity of silvered orthogonal twin mirrors is better than that of aluminum or aurum mirrors at the range of 0.4μm～10μm,and the silvered orthogonal twin mirrors have less influence on polarization ratio than those of aluminum and aurum mirrors. Therefore,the silvered orthogonal twin mirrors are recommended to be used in remote sensing of polarization. The influence of the silvered orthogonal twin mirrors on radiance and polarization ratio is very small if the angular error is controlled within 0.5°. The depolarization performance of the mirrors is well enough to satisfy the requirement of scanning polarimeters.