基于紧凑结构的Czerny-Turner光谱仪的程序化设计方法

在满足光谱性能的同时,能最大化减小Czerny-Turner(CT)光谱仪光学系统尺寸,并防止入射光线与衍射光线发生干涉,创建了完整的结构参量选定体系。提出了光栅方程的变式,确定了防止入射光线与衍射光线发生干涉的约束条件,建立了光路结构的数学模型,确定了各个结构参量的计算公式。在此基础上将参量的确定过程编程简化,输入系统的分辨率、波长范围、数值孔径值和元件之间最小距离,即可直接得到光路结构的所有设计参量,实现了快速通用的CT光谱仪的设计方法。通过实例验证得到光谱范围780～1020 nm、分辨率0.4 nm、体积54 mm×56 mm×30 mm的光谱系统,可为其他设计提供参考。

A programmatic design method of Czerny-Turner spectrometer based on compact optical structure

In order to minimize the size of the optical system of Czerny-Turner (CT) spectrometer and prevent interference of incident rays and diffracted rays, a complete selection system of structural parameters is created to satisfy the spectral performance. A variant of the grating equation is proposed, and the constraint conditions are determined to prevent interference of incident rays and diffracted rays. A mathematical model of the optical structure is established and the calculation formulas of structural parameters are determined. On this basis, the determination of the parameters is simplified by programming and all design parameters of the optical structure can be directly obtained once the intended resolution, the wavelength range, the NA value and the minimum distance between components in the system are input into the system. A fast and universal design method of CT spectrometer is realized. A design example with a spectral range of 780~1020 nm, a resolution of 0.4 nm and a volume of 54×56×30 mm³ is given for verification. It can provide reference for other designs.