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红外热象仪光机扫描系统的尺寸计算可采用光路展开作图法,其缺点是不精确,不能揭示出普遍规律。本文推导了某一扫描机构的理论计算公式。现设有效光阑为物镜的端截平面,若能找到有效光阑经它前面的光学扫描系统成象后的数学表达式,便可得到计算扫描系统尺寸的已知条件。经推导得到入瞳中心法线方向余弦在物空间坐标系的表达式如下: cosα=cosB·cos2C·cos(B+2D)+sinB·sin(B+2D), cosβ=cosB·cos2C·sin(B+2D)-sinB·cos(B+2D), cosγ=cosB·sin2C。B角为对应视场中心的已知量,C、D为扫描角。
The calculation of the size of infrared thermal imager light machine scanning system can be carried out by the light path drawing method, the disadvantage of which is inaccuracy and can not reveal the universal law. This article deduces the theoretical calculation of a scanning mechanism. The utility model is provided with an end-stop plane of the objective lens. If the mathematical expression of the effective diaphragm after imaging through the optical scanning system in front of it is found, the known condition for calculating the size of the scanning system can be obtained. The expression of the cosine in the object space of the normal direction of the entrance pupil center is derived as follows: cosα = cosB · cos2C · cos (B + 2D) + sinB · sin (B + 2D), cosβ = cosB · cos2C · sin B + 2D) - sinB · cos (B + 2D), cos γ = cosB · sin2C. Angle B is the known amount corresponding to the center of the field of view, and C and D are the scanning angles.