四、光学系统设计1.偏光弹性仪中的光学系统设计,应达到下列四种目的:(1)光线通过光学模型时应尽可能的成为平行光,但在实际应用上完全的平行光是不可能的,这就需要求射到模型上的园锥光的锥度是较小,园锥光的顶点应落在模型中间平面上,锥轴应该与模型的平面相垂直。(2)模型及其条纹通过投影镜头所构成的影象应该有足够的清晰,其相似的几何形 Fourth, the optical system design 1 Polarimeter in the optical system design, should achieve the following four purposes: (1) light through the optical model should be as possible parallel light, but in practice the exact parallel light is not Possibly, this requires that the cone of the cone of light to be launched onto the model has a smaller taper, the vertex of the cone of cones should fall on the midplane of the model, and the cone axis should be perpendicular to the plane of the model. (2) The image formed by the model and its streaks through the projection lens should be sufficiently sharp that its similar geometry