摘要
根据光学系统中不同材料的热导率,分析了环境温度急剧变化时系统中存在的轴向和径向温度梯度分布,以及由此导致的光学系统面形变化、光学元件间隔变化和光学介质折射率分布的变化,给出了温度梯度分布下光学系统参数重建的模型和算法,利用数值积分和正交多项式拟合计算温度梯度下的面形,计算精度可达10-7,编写了可重建光学系统结构和折射率函数并计算成像质量的软件。实例计算表明,径向温度梯度会引起光学元件更大的变形,与轴向梯度相比对像质的影响更为严重。
The axial and radial temperature gradients are analyzed according to the coefficients of thermal conductivity of the materials in optical systems when the ambient temperature is changing quickly. The change of surface shape of each optical component, the changes of separations between adjacent components and the new refractive index distribution are discussed. The mathematical model and algorithm used for parameter rebuilding of optical systems at gradient temperature are presented. The new surface shapes are calculated with the error of 10-7 using numerical integration and orthogonal polynomial fitting, and the program for parameter rebuilding of optical systems and outputting image quality is developed. It is shown by the example that radial temperature gradient will lead to more deform of optical components and severe damage to the image quality than axial temperature gradient.
出处
《航空兵器》
2009年第6期31-34,共4页
Aero Weaponry
基金
航空科学基金资助项目(20060112111)
关键词
温度梯度
无热化设计
像质评价
temperature gradient
athermal optical design
image quality evaluation
