One kind of constant deviation prisms which can invariably transform the propagating direction of a ray or a beam is analyzed in this paper. Its transfer characteristics could be described by 2 x 2 matrix and its misaligned transfer characteristics could be described by 3 x 3 augmented matrix. Under the condition of manufacturing tolerance, its transfer matrices are also given. And it is shown that the constant deviation prism is a two-dimensional insensitive component. [References: 4]
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机译：本文分析了一种可以不变地改变射线或光束的传播方向的恒偏棱镜。它的传递特性可以用2 x 2矩阵描述，而未对准的传递特性可以用3 x 3增强矩阵描述。在制造公差的条件下，还给出了其传递矩阵。并且示出了恒定偏差棱镜是二维不敏感分量。 [参考：4]
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