透射式内调焦宽光谱光学系统的设计与分析

Design and Analysis of the Transmitted Inner Focusing Wide Spectrum Optical System

为了在实现系统内调焦的同时保证宽光谱系统的优良像质,通过合理选材对宽光谱光学系统中存在的位置色差以及二级光谱进行校正,并提出了一种内调焦宽光谱光学系统的设计方法.建立内调焦消色差的数学模型,推导系统设计所需满足的公式.结合提出的数学模型与推导出的公式,以焦距为90mm、F数为2.8、具备内调焦功能的宽光谱光学系统为例进行验证.结果表明,系统可在420~900nm的宽光谱范围内对0.2~200km位置内的目标进行色差校正,验证了内调焦宽光谱光学系统设计方法与消色差数学模型的正确性.

In order to realize the inner focusing and meanwhile ensure the excellent image quality of the wide spectrum system,the position chromatic aberration and secondary spectrum in the wide spectrum optical system are corrected through the reasonable selection of materials,and a kind of design method of the wide spectrum optical system with inner focusing is proposed.The mathematical model of the achromatic with inner focusing is established,and the formulas that the system design needed are deduced.Combined with the proposed mathematical model and the derived formulas,a wide spectrum optical system with a focal length of 90 mm,the Fnumber of 2.8 and the function of inner focusing is taken as an example.The result shows that in the range of 420~900 nm,the system can correct the chromatic aberration of the target at the distance of 0.2~200 km.The correctness of the design method and mathematical model of the inner focusing wide spectrum optical system is verified.