波前编码Schmidt系统的设计

利用波前编码技术实现了Schmidt系统在-60℃~+60℃的无热化设计。以视场角为±4°、相对口径为1/2的经典Schmidt系统为研究对象,设置一个三次立方表面作为波前编码表面。以传递函数大于零为约束条件,在尽可能大的离焦量范围内对波前编码表面的参数进行优化,得到了离焦量达士0.6 mm的Schmidt系统,焦深比经典的Schmidt系统延拓了20倍。分析了不同温度下的弥散斑和传递函数数据。结果表明,该波前编码Schmidt系统在-60℃~十60℃间具有良好的温度适应性,而且光学性能稳定,便于进行后续的图像复原。

Design of Schmidt Optical System Using Wavefront Coding

AThe athermalization of a Schmidt optical system in the temperature range from -60℃to ±60 ℃ is designed by using wavefront coding. Taking a classical Schmidt system with a field angle of ±4℃ and a relative aperture of 1/2 as an object to be studied, a cubic surface is used as the wavefront coding surface. Under the constraint condition of a transfer function greater than zero, the parameters of the wavefront coding surface are optimized in a defocus range as large as possible. A Schmidt system with a defocus amount up to ±0.6 mm is obtained. Its focal depth is extended by a factor of 20 compared with that of the classical Schmidt system. Its defocused spot and transfer function data at different temperatures are analyzed. The result shows that this Schmidt system with wavefront coding has good adaptability in the temperature range from -60℃ to ＋60 ℃. Its optical performance is stable, so it facilitates the subsequent image restoration.